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SECTION 12J-1 LOW SERIES BODY CONTROL MODULE

CAUTION: This vehicle will be equipped with a Supplemental Restraint System (SRS). A SRS will consist of either seat belt pre-tensioners and a driver's side air bag, or seat belt pre-tensioners and a driver's and front passenger's side air bags. Refer to CAUTIONS, Section 12M, before performing any service operation on, or around any SRS components, the steering mechanism or wiring. Failure to follow the CAUTIONS could result in SRS deployment, resulting in possible personal injury or unnecessary SRS system repairs.

CAUTION: This vehicle may be equipped with LPG (Liquefied Petroleum Gas). In the interests of safety, the LPG fuel system should be isolated by turning 'OFF' the manual service valve and then draining the LPG service lines, before any service work is carried out on the vehicle. Refer to the LPG leaflet included with the Owner's Handbook for details or LPG Section 2 for more specific servicing information.

1. GENERAL DESCRIPTION A Body Control Module (BCM) combines into one central module, the control or assist of various vehicle electrical systems or features, rather than having individual modules for each system or feature. Low Series BCMs are fitted as standard equipment on all VT Series Executive, Acclaim, S and SS Models. NOTE: Two levels of Low Series BCM have been released; a LOW level for vehicles without power operated windows and a MID level for vehicles with power operated windows. If a service operation or diagnostic procedure requires that a Low Series BCM be replaced, ensure that the correct BCM level is reinstalled for the particular level of vehicle. Fig. 12J-1-1 illustrates the identification details for the Low Series BCM. External identification can be made by referring to the last three digits of the BCM part number. Specific software has been developed for use with the TECH 2 diagnostic scan tool to assist with various vehicle electrical system fault finding, including the various BCM functions and controls. The TECH 2 connection for the Low Series Australian Arrow BCM serial data communication is via the Data Link Connector (DLC), attached to the instrument panel lower right hand trim, to the left of the steering column, refer to Fig 12J-1-2. The Low Series BCM is located beneath the instrument cluster, to the right of the steering column, refer to Fig. 12J-1-2.

BODY CONTROL MODULE FEATURES

BCM FEATURE LEVEL 1LOW - 688

LEVEL 1 (OPTIONAL)MID - 686

Serial Data Interface (SDI) (Bus master) A A

Central door locking A A

Boot release with speed interlock A A

Power window system N/A A

Dome lamp delay control A A

Heated rear window control A A

Intermittent and synchronised to front rearwiper control with full wipe in reverse gear(wagon only)

N/A A

Fixed dwell wiper control A A

Auto lights OFF (fixed) A A

Engine disable A A

Engine cooling low speed fan control A A

Cruise control interface A A

SRS (air bag) deployment vehicleshutdown

A A

Air conditioning interface A A

N/A = NOT AVAILABLEA = AVAILABLE

Figure 12J-1-1

LOW SERIES BCM TERMINAL IDENTIFICATION

Figure 12J-1-2

YB165 CONNECTOR 4PIN NO. DESCRIPTION CIRCUIT WIRE

COLOURCIRCUIT TYPE

A1 DEMSIST OUTPUT 292 B/R OA2 WIPER OUTPUT 90 BR OA3 WINDOW POWER

OUTPUT173 Y O

A4 REAR WIPEROUTPUT

492 GY/BLU O

A5 EARTH 155 B/Y EA6 BATTERY POSITIVE 740 O/B PA7 NCA8 THEFT DETERRENT

LED OUTPUT263 LBLU O


COLOURCIRCUIT TYPE

B1 BLOWER INHIBITOUTPUT

401 G O

B2 POWER WINDOWDOWN OUTPUT

674 G/W O

B3 A/C BLOWER INPUT 359 DKG/Y PPUB4 RIGHT INDICATOR

OUTPUT15 BLU O

B5 INDICATOR POWER 140 O/R PB6 ALARM STATUS

OUTPUT260 Y/B O

B7 LOW FAN SPEEDOUTPUT

473 O/B O

B8 A/C LED OUTPUT 962 R/BR OB9 WIPER PARK INPUT 196 Y PPU

B10 DOOR LOCK POWER 440 O/V PB11 POWER EARTH 151 B/G EB12 LEFT INDICATOR

OUTPUT14 LBLU O


COLOURCIRCUIT TYPE

C1 NCC2 NCC3 DRIVER’S DOOR

UNLOCK OUTPUT293 BLU/B O

C4 NCC5 NCC6 NCC7 PASSENGER’S DOOR

AJAR INPUT125 W PPU

C8 DRIVER’S DOORAJAR INPUT

126 GY/W PPU

C9 PASSENGER’S DOORINLOCK INPUT

194 BR/O PPU

C10 NCC11 NCC12 DEADLOCKS 394 V/W OC13 ALL DOORS LOCK

OUTPUT295 B/Y O

C14 WINDOW DOWNINPUT

167 G/B PD

C15 NCC16 WINDOW UP INPUT 672 BLU/W PDC17 NCC18 NCC19 NCC20 UNLOCK INPUT 193 LG/Y PPUC21 LOCK INPUT 195 BR/R PPUC22 DEADLOCK REQUEST

INPUT197 BR/W PPU

C23 NCC24 DOME LAMP OUTPUT 174 W/G OC25 BOOT OUTPUT 142 R/G OC26 PASSENGER’S DOOR

UNLOCK OUTPUT294 B/R O


COLOURCIRCUIT TYPE

D1 REMOTE RECEIVER(DATA)

266 Y I

D2 SERIAL DATA MAINBUS

1221 R/B I/O

D3 SERIAL DATAAUXILIARY BUS

1220 G/W I/O

D4 AIR CONDITIONINGTHERMOSTAT

53 G PD

D5 ILLUMINATION LINK 8 G/Y LINKD6 IGNITION INPUT 39 P/B PD, PD7 REAR WIPE INPUT 1391 GY/R PDD8 CRUISE ON INPUT 83 GY PDD9 A/C SWITCH INPUT 248 R/W PD

D10 INTERMITTENTWIPER INPUT

97 BLU/W PD

D11 REMOTE RECEIVER(EARTH)

271 BR/G E

D12 SLIP RING 229 V/R I/OD13 SDM SERIAL DATA

BUS1220 G/W I/O

D14 LIGHTS OFF EARTHOUTPUT

1150 B PD, O

D15 ILLUMINATION LINK 151 B/G LINKD16 BOOT RELEASE

INPUT1144 B/R PPU

D17 NCD18 FRONT SCREEN

WIPE / WASH INPUT94 LBLU PD

D19 REAR SCREEN WASHINPUT

494 W/BLU PD

D20 DEMIST INPUT 291 O PD

GLOSSARYE - Earth O - Output P - Power PU - Pull upPPU - Pulsed pull up PD - Pull down I - Input I/O - Input / OutputNC - No circuit

B - Black W - White R - Red P - PinkO - Orange Y - Yellow V - Violet BLU - BlueG - Green LG - Light green BR - Brown GY - GreyT - Tan LBLU - Light blue DKBLU - Dark blue

1.1 SERIAL DATA COMMUNICATION (BUS MASTER)

GENERAL INFORMATIONThe VT Series Model uses a BUS MASTER communication system, where the BCM is the bus master.The BCM periodically polls (surveys) each device on the bus and requests status data.The devices connected to the bus are:

• Body Control Module (BCM)• Powertrain Control Module (PCM)• Instrument cluster (INS)• Anti-lock Brake/Electronic Traction Control System (ABS/TCS)• Supplemental Restraint System (SRS)• External diagnostic tool (TECH 2)

The data provided by each device may be utilised by any device connected to the bus.Each device has a unique response Message Identifier Word (MIW) for ease of identification.The bus master (BCM) polls each device with a serial data message which includes that devices MIW. The deviceresponds by putting a serial data message onto the bus which includes its MIW and data, of which is retrieved andutilised by any device requiring it.The BCM polls each device for a status update, once every 300 milliseconds. The exception to this being the PCMwhich is polled twice every 300 milliseconds.When the ignition switch is turned from the OFF position to the ON position, the BCM will communicate with thePCM for anti theft purposes. If the BCM does not receive an OK TO START message from the PCM within 0.5seconds of ignition on, the auxiliary data bus is isolated via switching from the BCM.The isolation of the auxiliary data bus during this period eliminates the possibility of a device failure other than theBCM or PCM, causing a problem on the bus and inhibiting antitheft communications.This period (short loop time) continues until the PCM responds with an acknowledgment or a maximum of fiveseconds after which the BCM will switch to the standard polling sequence.Following successful antitheft communications, the BCM begins sequential polling of devices on the bus and normalsystem operation is established.When the ignition switch is in the OFF position, the BCM continues to poll, allowing for TECH 2 communicationsand external control of the bus prior to the ignition being switched on.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to eitherthe relevant diagnostic section or Section 12P Wiring Diagrams.

SYSTEM OVERVIEW

SRS SERIAL DATA AUX. D13

SRS

INSTRUMENTSABS/ETC

SERIAL DATA AUX. D3

B

C

M

BATTERY POWER A5

PCMDLC

SERIAL COMMUNICATIONS

D2 SERIAL DATA MAIN

INPUTS / OUTPUTS

Figure 12J-1-3

Figure 12J-1-4

SERIAL DATA SIGNAL - MAINBCM terminal D2, serial data signal - main, refer to Fig. 12J-1-3, is connected to the PCM and DLC via circuit 1221(Red/Black wire). It is via this line that the BCM communicates with the PCM and external devices connected to theDLC, at all times.

SERIAL DATA SIGNAL - AUXILIARYBCM terminal D3, serial data signal - auxiliary, refer to Fig 12J-1-3, is connected to the INS, ABS/ETC and SRSmodules via circuit 1220 (Green/White wire). It is via this line that the BCM communicates with these devices, aftersuccessful anti theft communications between the PCM and BCM (via the serial data - main line when the ignitionswitch is turned from the OFF to ON position).During anti theft communications, the serial data - auxiliary line is isolated from the serial data - main line viaswitching within the BCM If the BCM does not receive an OK TO START message from the PCM within 0.5seconds of ignition on (this will continue for a five second period if there is still no acknowledgment from the PCM,before it starts polling)

INPUTS

IGNITION SWITCH ON INPUT SIGNALThe BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in the IGN or START position, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire), refer to Fig. 12J-1-4.

1.2 CENTRAL DOOR LOCKING SYSTEM

GENERAL INFORMATIONNOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.The central door locking system provides for locking and unlocking of all doors and tailgate (station wagon models)as well as enhanced locking or 'deadlock' (doors only).The system incorporates the following functions:1. Door and tailgate locking activated via:

Driver's door lock actuator (mechanically linked to door interior snib and door latch).Left hand front passenger’s door lock actuator (mechanically linked to interior snib button).Driver’s door key lock cylinder micro switches, which are also mechanically linked to the door latch, andtherefore linked to the actuators. VT Series Models require micro switch activation to force lock (and unlock)without moving the actuator.Pressing the lock button on remote coded key (provided all doors are closed

2. Door and tailgate unlocking via:All door lock actuators (mechanically linked to door interior snib).Pressing the unlock button on remote coded key.The driver’s door key lock cylinder can also be moved independently of the actuator, allowing unlocking of thedriver’s door latch in the case where the actuator is struck down, ie. deadlock when the battery is discharged.

3. Single and Two Stage UnlockingThe BCM is capable of operating in either of two unlock modes, either two or single stage unlock. The BCM, asfitted to the vehicle is programmed to operate the central door locking system in the two stage unlock mode.

Two Stage UnlockIn two stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds, the BCM, onreceiving the unlock request from the remote coded key, via the remote receiver, will unlock the driver’s door only. Ifthe remote coded key unlock button is depressed again for 0.25 seconds the BCM, on receiving the second unlockrequest from the remote coded key, will unlock all passenger doors.Or alternatively, if the remote coded key is depressed continuously for 0.5 seconds, the BCM, on receiving theunlock request from the remote coded key, will unlock all doors, first the driver’s door, then all passenger doors.

Single Stage UnlockIn single stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds or longer,the BCM on receiving the unlock request from the remote coded key, will unlock all doors simultaneously.With TECH 2, the BCM can be programmed to operate in either two stage or single stage unlock (depending on thevehicle’s owner or operator requirements).If a short circuit exists on either the lock or unlock signal inputs, the opposing input is still able to perform itsfunction. This enables the doors to be unlocked when a short circuit exists on the lock input or vice-versa.To protect the motors used in the door and tailgate lock actuators, in the event of multiple activation's within adefined time period, the system will 'time-out' and protect the motors from damage. After a fixed time delay, thesystem will re-activate as normal.The deadlock feature provides for mechanical jamming of the door lock actuators. This is achieved electrically viathe driver's door key lock cylinder micro-switch.NOTE:Deadlock is inhibited whilst the ignition is on.Operation of the Central Door Locking System is also affected by the Theft Deterrent System, refer to 1.4 THEFT DETERRENT SYSTEM in this Section.

SYSTEM CHECKThe operation of the Central Door Locking System is independent of the ignition being switched ON or OFF.The Figure below shows the key positions on the driver’s door for the various key locking functions.Deadlock refers to the electrical means that can be activated to ensure vehicle security by inhibiting door lockoperation.Even though the electronic theft deterrent system, via the remote coded key, can activate the doors locks, it doesnot engage the electrical 'blocking' of the doors (deadlocking).

Figure 12J-1-5

CENTRAL LOCKING AND UNLOCKINGOperation of this system can be effected as follows;1. Driver’s door, outside key and inside locking (snib) button (locking and unlocking).2. Left hand front passenger door inside locking (snib) button (locking and unlocking)3. Rear passenger doors inside locking (snib) button (only unlocking is possible).

DEADLOCKThe deadlocking feature applies to all four doors, but not to the luggage compartment lid or tailgate.After the deadlocking feature device has been engaged, unlocking is possible at the driver’s door from outside, byinserting the key into the driver’s door lock cylinder and turning the key to the unlock position or activating the unlockbutton on the remote key unlocks the deadlocks on all doors, but only unlocks the driver’s door (providing two stageunlocking is enabled).To ensure access to the vehicle if the electrical system should fail (discharged battery), after the system has beenengaged, the driver’s door lock cylinder can be moved independently of the actuator and therefore allowingunlocking of the driver’s door latch.The rear compartment lid or tailgate can be locked/unlocked when the mechanical deadlocking feature is actuated,while leaving the doors secured.NOTE:Deadlocking is not possible with the ignition in the ON position.

REMOTE CODED KEY CHECKCheck that the remote coded key locks all doors when the remote coded key lock button is pressed, at a distancewithin 4 metres from the driver’s side B pillar.When the remote coded key unlock button is pressed the driver's side should unlock (vehicles programmed for twostage unlock). Pressing the unlock button again and all passenger doors (and tailgate on station wagon models)should unlock.On vehicles programmed for single stage unlock, the single press of the unlock button will unlock all doors andtailgate on station wagon models.If this test does not prove satisfactory, refer to 2.3 REMOTE CODED KEY in this Section for a more detaileddiagnosis before continuing with the central locking system check.

Figure 12J-1-6

CHECKING THE DEADLOCK FEATUREOpen all windows.Close all doors.Actuate the deadlock feature from the driver’s door with the key.Check that all door lock buttons cannot be pulled up. They are electrically blocked.NOTE:The door lock (snib) buttons can be pulled up slightly, but they will be under tension.

OVERHEATING PREVENTIONIn the event of multiple activations within a defined time period, the central door locking system will be deactivatedand remain inoperative for a defined time period to prevent the door actuators from overheating. After a fixed timedelay, the system will re-activate and operate as normal.

SYSTEM OVERVIEW

BODY

CONTROL

MODULE

BODY

CONTROL

MODULE

CENTRAL DOOR LOCKING SYSTEM

C26 DOOR UNLOCK DRIVE

C13 DOOR LOCK DRIVE

C3 DRIVER'S DOORUNLOCK DRIVE

C12 DEADLOCK DRIVE

BATTERY POWER A6

DOOR LOCK POWER B10

DRIVER'S DOORUNLOCK C20

LOCK REQUEST C21

LOCK/DEADLOCKREQUEST C22

UNLOCK REQUEST C9

REMOTE RECEIVER

CIRCUIT OPERATIONThe door and tailgate locks are operated by reversible motors that receive voltage from relays within the BCM.These relays operate the motors by applying battery voltage to one side of each motor and earth to the other side.The central door locking system has four operational phases as follows:

1. Lock to Unlock 2. Unlock to Lock3. Lock to Deadlock 4. Deadlock to Unlock

The circuit operation of each of these four phases is described as follows:

LOCK TO UNLOCK OPERATION(Refer to Fig. 12J-1-10)

DRIVER’S DOOR REQUEST UNLOCK INPUT SIGNAL(Refer to Fig. 12J-1-7)When unlocking the doors and tailgate via the right hand front door lock cylinder microswitch or interior snib button,BCM terminal C20 (driver's door request unlock signal), is connected to earth by the driver’s door lock actuatorswitch contacts changing position from terminals 4-5 to 3-5 or in the case of the driver’s door cylinder micro switch,C20 is connected to earth via the microswitch contacts, unlock position circuit 156 (Black/Blue wire). This actioncauses the voltage on terminal C20, circuit 193 (Light Green/Yellow wire), to be pulled low, less than 0.2 volts(driver’s door unlocked). This low voltage at terminal C20 is seen by the BCM as a driver’s door request unlocksignal.

NOTE:Manually activating any unlock request line will cause all doors to be unlocked.

Figure 12J-1-7

PASSENGER DOOR UNLOCK REQUEST INPUT SIGNAL(Refer to Fig. 12J-1-8)When unlocking the doors via any passenger door interior snib button, BCM terminal C9 (passenger door unlockrequest signal) is connected to earth by the activated passenger door lock actuator switch contacts, terminals 3,circuit 194 (Brown/Orange wire) and 5, circuit 156 (Black/Blue wire). This action causes the voltage on terminal C9,circuit 194 to be pulled low, less than 0.2 volts (doors unlocked). This low voltage at terminal C9 is seen by the BCMas a passenger door unlock request signal.

Figure 12J-1-8A low voltage at terminal C20 or C9 is seen by the BCM as a system unlock request. This then enables the BCM toenergise the internal unlock relay for approximately 0.75 seconds. This causes the unlock relay contacts to closeand battery voltage is applied, via fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10 andC26, to terminal 2 of each of the passenger door lock actuators and to the tailgate lock actuator (station wagonmodels), circuit 294 (Black/Red wire). Battery voltage is also applied, via fuse F20, circuit 440 (Orange/Violet wire)and BCM terminals B10 and C3, to terminal 2 of the driver’s door lock actuator, via circuit 293 (Blue/Black wire).The opposite terminal of the door lock actuators (terminal 1) is connected to earth via BCM terminal C12, circuit 394(Violet/White wire) through the BCM’s internal deadlock relay contacts and BCM terminal B11, circuit 151(Black/Green wire). This causes the door lock actuator motor armatures to rotate from the lock to the unlockposition, and the door lock actuator switch contacts to change from terminal 1 to 6. The rotation of the passengerdoor lock actuator motor armatures also causes the door lock switch contacts to change from the lock to the unlockposition. The tailgate lock actuator motors are earthed via the BCM terminal C13, circuit 295 (Black/Yellow wire),through the BCM’s internal lock relay contacts and BCM terminal B11 and circuit 151 (Black/Green wire).

REMOTE CODED KEY OPERATION(Refer to Fig 12J-1-9 for remote receiver, Fig. 12J-1-11 for first stage of two stage unlock and Fig. 12J-1-12 forsecond stage of two stage unlock)

TWO STAGE UNLOCKIf the BCM is operating in the two stage unlock mode and the remote coded key unlock button is depressed for 0.25seconds, the BCM, on receiving the unlock request from the remote coded key, via the remote receiver, activatesthe microprocessor within the BCM, causing the driver’s door unlock relay to toggle to the unlock state, unlockingthe driver’s door only as described previously.If the remote coded key unlock button is depressed again for 0.25 seconds, the microprocessor within the BCM, onreceiving the second unlock request from the remote coded key, will toggle the unlock relay contacts to the unlockstate and the passenger doors (and tailgate) will unlock as described previously.If the remote coded key is depressed continuously for 0.5 seconds, the microprocessor within the BCM, onreceiving the unlock request from the remote coded key, will unlock all doors, first the driver’s door, then allpassenger doors (and tailgate), as described previously.

SINGLE STAGEIf the BCM is operating in the single stage unlock mode and the remote coded key unlock button is depressed for0.25 seconds, the microprocessor within the BCM, on receiving the RF unlock request from the remote coded key,causes the unlock relay contacts to toggle to the unlock state, all doors (and tailgate) will then unlock as describedpreviously.

Figure 12J-1-9

Figure 12J-1-10

Figure 12J-1-11

Figure 12J-1-12

UNLOCK TO LOCK OPERATION(Refer to Fig. 12J-1-15)

LOCK REQUEST(Refer to Fig. 12J-1-13)When locking the doors and tailgate via the driver’s door interior snib button, the BCM terminal C21, circuit 195(Brown/Red wire), is connected to earth, circuit 156 (Black/Blue wire) by the driver’s door lock actuator key switchcontacts changing over from terminals 3-5 to 4-5.This action causes the voltage on terminal C21, circuit 195 (Brown/Red wire), to be pulled low, less than 0.2 volts(doors locked).This low voltage at terminal C21 is seen by the BCM as the system lock request.

LOCK AND DEADLOCK REQUEST(Refer to Fig. 12J-1-14)When locking the doors and tailgate via the driver’s door lock cylinder microswitch, BCM terminal C22(lock/deadlock request signal) is connected to earth via the microswitch contacts, lock position, circuit 156(Black/Blue wire). This action causes the voltage on terminal C22, circuit 197 (Brown/White wire) to be pulled low,less than 0.2 volts (door locked). This low voltage at terminal C22 is seen by the BCM as the system lock request(only if the driver’s door is closed).Either of these two lock requests (via snib or driver’s door microswitch) then enable the BCM to energise theinternal lock relay for approximately 0.75 seconds, the lock relay contacts close and battery voltage is applied, viafuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10 and C13, to terminal 6 of each door lock actuatorand to the tailgate actuator, circuit 295 (Black/Yellow wire).The opposite terminal (terminal 2) of the passenger doors and tailgate door lock actuator motors is connected toearth through BCM terminal C26, circuit 294 (Black/Red wire), the internal unlock relay contacts and through BCMterminal B11 to earth, circuit 151(Black/Green wire). The opposite terminal (terminal 2) of the driver’s door lockactuator motor is connected to earth through BCM terminal C3, circuit 293 (Blue/Black wire), the internal driver’sdoor unlock relay contacts and through BCM terminal B11 to earth, circuit 151 (Black/Green wire).This allows the door lock actuator motor armatures to rotate to the lock position and causes the door lock actuatorswitch contacts to change from terminals 6 to 1. This action disconnects the voltage supply to the door lock actuatormotor armatures, the armatures now have earth connection on both sides, with actuator terminals 6 earthedthrough the deadlock relay terminals and through BCM terminal B11 to earth circuit 151 (Black/Green wire). Thiscauses an instantaneous halt to door lock actuator motor armature rotation.This rotation of the passenger door lock actuator motor armatures also causes the passenger door lock switchcontacts to change to the lock position.After approximately 0.75 seconds, the power to all the actuators via BCM terminal C13 circuit 295 (Black/Yellowwire) is disconnected by the opening of the internal lock relay contacts.

REMOTE CODED KEY OPERATIONWhen locking the doors via the remote coded key, the RF output signal from the key, via the remote receiver,activates the microprocessor within the BCM, causing the door lock relay to be energised locking all doors (andtailgate) as described previously. If any door does not lock either BCM terminal C20 (driver’s door request unlock)or C9 (Unlock request) will remain low, this low voltage is seen by the BCM as an unsuccessful attempt to lock alldoors and the BCM will suppress the indicators flash (driver’s door must be closed).

Figure 12J-1-13

Figure 12J-1-14

Figure 12J-1-15

UNLOCK TO DEADLOCK OPERATION(Refer to Fig. 12J-1-17)LOCK / DEADLOCK REQUEST INPUT SIGNAL(Refer to Fig. 12J-1-16)NOTE:This operation will only work if the driver’s door is closed and the ignition is off. If the driver’s door is opened, thedoor will not lock and if the ignition is on, the doors will not deadlock.Deadlocking is activated after two sequential lock activation’s of the driver’s door lock switch. This action causes themicro-switch contacts to change to the lock position. This connects BCM terminal C22 circuit 197 (Brown/Whitewire) to earth via circuit 156 (Black/Blue wire), causing the voltage on terminal C22 to be pulled low, less than 0.2volts.This low voltage at terminal C22 is seen by the BCM as the system deadlock request. This enables the BCM toenergise the internal lock and deadlock relays for approximately 0.75 seconds, the lock and deadlock relayscontacts close and battery voltage is applied, via fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10,C13 and C12, circuit 295 (Black/Yellow wire) and 394 (Violet/White wire) to terminals 6 and 1 of each electric doorlock motor.The opposite terminal (terminal 2) of all the passenger lock actuator motors is connected to earth through BCMterminal C26, the internal unlock relay contacts and through BCM terminal B11 to earth, circuit 151 (Black/Greenwire). Terminal 2 of the driver’s door lock actuator motors is connected to earth through BCM terminal C3, theinternal driver’s door unlock relay contacts and through BCM terminal B11 to earth, circuit 151 (Black/Green wire).This causes the door lock actuator motor armatures to rotate in the locking (downward) direction into the deadlockposition. This rotation of the door lock actuator motor armatures also causes the door lock actuator switch contactsto change from terminals 6 to 1 to 6.NOTE:The tailgate actuator is not designed to go to deadlock.

Figure 12J-1-16

Figure 12J-1-17

DEADLOCK TO UNLOCK OPERATION(Refer to Figs. 12J-1-18 and 12J-1-19)When unlocking the doors from the deadlock position by the driver’s door lock cylinder, by turning to the unlockposition, the microswitch contacts change to the unlock position. This connects BCM terminal C20 circuit 193 (LightGreen/Yellow wire), to earth via circuit 156 (Black/Blue wire), causing the voltage at terminal C20 to be pulled low,less than 0.2 volts.This low voltage at terminal C20 is seen by the BCM as the driver’s door unlock request signal. This then enablesthe BCM to energise the internal unlock relays for approximately 0.75 seconds. This causes the relay contacts totoggle and battery voltage is applied, via fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10, C26(passenger doors unlock, drive, circuit 294 (Black/Red wire)) and C3 (drivers door unlock, drive, circuit 293(Blue/Black wire)) to terminals 2 of each of the door lock actuators and to the tailgate lock actuator.

Figure 12J-1-18Initially, actuator terminal 6 is connected to earth via circuit 295 (Black/Yellow wire) through the BCM terminal C13,through the internal lock relay contacts to terminal B11 to circuit 151 (Black/Green wire). This then allows thepassenger door lock actuator motor armatures to rotate from the deadlock toward the unlock position, causing thepassenger door lock actuator switch contacts to change from terminal 6 to 1. As terminal 1 is connected to earth viacircuit 394 (Violet/White wire) through terminal C12 of the BCM, the deadlock relay contacts to terminal B11 tocircuit 151 (Black/Green wire), the door lock actuator motor armatures will continue to rotate further to the unlockposition.This rotation of the passenger door lock actuator motor armatures causes the door lock actuator switch contacts tochange back to terminal 6. This rotation of the passenger door actuator lock motor armatures also causes thepassenger door lock switch contacts to change to the unlock position.NOTE:If the ignition is off, the doors may be unlocked from the deadlock position by activating the unlock button on theremote key. If set for two stage unlock, the driver’s door will fully unlock (deadlock to unlock) and the remainingpassenger doors will go from the deadlock position to the lock position. If set for single stage unlock, all doors willgo from the deadlock position to the unlock position.

Figure 12J-1-19

1.3 BOOT RELEASE

GENERAL INFORMATIONThe rear compartment lock actuator is controlled by pressing the rear compartment lock switch which is located inthe glove compartment, or pressing the boot release button on the remote coded key which in turn transmits an RFoutput signal. The RF signal is received by the BCM’s remote receiver and activates the microprocessor within theBCM.The BCM will monitor the rear compartment lock switch and remote boot signal and inhibit boot release if thevehicle speed is above 15 km/h.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BODY

CONTROL

MODULE

BATTERY POWER A6

BOOT RELEASE

SERIAL DATA MAIN D2

REMOTE RECEIVER D1

PCM

BOOT RELEASE D16

VEHICLE SPEED SENSOR C25 BOOT SOLENOID DRIVE

CIRCUIT OPERATION

BATTERY POWERBattery voltage is applied to the BCM microprocessor from terminal A6 at all times from fusible link FS and fuse F31via circuit 740 (Orange/Black wire).

INPUTSSerial Data Signal(Refer to Fig. 12J-1-20)BCM terminal D2, serial data bus, is connected to the PCM terminal A3, via circuit 1221 (Black/Red wire). It is viathe serial data bus line that the BCM receives serial data relating to the speed of the vehicle.

Figure 12J-1-20

BOOT RELEASE INPUT(Refer to Fig. 12J-1-21 and to Fig. 12J-1-22)Pressing the rear compartment lock switch causes the contacts to close, connecting BCM terminal D16 to earth viacircuit 1144 (Black/Red wire). This action causes the voltage at terminal D16 to be pulled low, less than 0.2 volts.This low voltage at terminal D16 is seen by the BCM as a boot release switch input signal. The BCM will not activatethe rear compartment lock actuator if the vehicle speed is greater than 15 km/h.

Figure 12J-1-21

Figure 12J-1-22

OUTPUTS(Refer to Fig. 12J-1-23)The BCM can activate the rear compartment lock actuator by energising it’s internal boot release relay. This willapply battery voltage from terminal B5, through the boot release relay contacts and terminal C25 to the rearcompartment release actuator, circuit 142 (Red/Green wire). The earth circuit for the rear compartment solenoid isvia the body and main wiring harness.

Figure 12J-1-23

1.4 THEFT DETERRENT SYSTEM

GENERAL INFORMATIONThe theft deterrent system on VT Series Models uses a remote coded key to arm and disarm the system, as well aselectrically lock or unlock all doors and tailgate (station wagon), or operate the boot unlock mechanism (sedan).NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OPERATIONThere are two modes of theft deterrent operation, armed and disarmed.

ARMEDThe theft deterrent system can be manually armed in one of two ways:Actively, by pressing the lock button on the remote coded key or,Passively, as the BCM will automatically arm 30 seconds after the ignition is turned off.When the system is armed, the start relay (located in the engine compartment relay housing) and the enginemanagement system control module (PCM) are disabled, preventing the engine from being started.

DISARMEDWith the system disarmed and the PCM enabled, the engine will be allowed to be started when the ignition switch isturned to the run position.The theft deterrent system can be disarmed in three ways:1. Pressing the unlock button on the remote coded key. This unlocks the doors, turns the interior dome lamp on

and disarms the system for 30 seconds.2. By inserting the remote coded key into the ignition switch cylinder and turning the ignition to the ON or run

position. This causes the BCM to read a security code serial data output from the remote coded key contact pinvia the remote coded key reader assembly.

3. The system can also be disarmed by turning the ignition switch to the ON position for approximately two hours(timed override function).

NOTE:Should the engine crank briefly when the ignition switch is turned to the START position (ie. due to mis-aligned or afaulty remote coded key reader) then pressing the unlock button on the remote coded key will also disarm the theftdeterrent system.The theft deterrent system has a timed override function. The theft deterrent system can be overridden (disabled),as for example in the event of a remote coded key failure, by turning the ignition switch to the ON position for twohours. The theft deterrent alert indicator LED will go out once the system has been disabled and normal starting ofthe vehicle can take place.

REMOTE CODED KEY(Refer to Fig. 12J-1-24)The theft deterrent system uses a remote coded key to arm and disarm the system, and electrically lock or unlockall doors and tailgate (station wagon), or operate the boot unlock mechanism (sedan models).The remote coded key is powered by its own internal battery. If its internal battery fails, the remote coded key canbe powered by the remote coded key reader once the key is inserted into the ignition switch cylinder and turned tothe IGN or START position.When the theft deterrent system is armed by pressing the remote coded key lock button, the indicators will flashonce and the theft deterrent alert indicator LED will begin to flash. Disarming the system by pressing the unlockbutton will cause the indicators to flash twice and the theft deterrent alert indicator LED will stop flashing.The Radio Frequency (RF) transmitted by the remote coded key is received by the BCM’s remote receiver locatedin the dash panel.NOTE:Passive arming of the system does not automatically operate the door locks or flash the indicators.

Figure 12J-1-24

THEFT DETERRENT ALERT INDICATOR LEDThe theft deterrent alert indicator LED is used to indicate the state of the system. A flashing LED indicates that thesystem is armed and consequently the vehicle cannot be started. When the LED is turned off, the BCM is disarmedand the engine can be started.The theft deterrent LED is incorporated into the trip computer module in the instrument panel facia.

OPERATION(Refer to Fig. 12J-1-25)When the ignition switch is turned to the ON position, the BCM polls the PCM and sends an encrypted BCM/Keysecurity code (The security code is received via the BCM slip ring or remote receiver in the event of no slip ringcommunication). The PCM compares the received security code with it’s stored security code and if the codesmatch, the PCM will enable injector fuelling and continue engine cranking. The PCM will return an OK TO STARTmessage, which tells the BCM to jump from SHORT LOOP mode to the LONG LOOP mode.NOTE:It is very important that the remote coded key reader is aligned correctly with the ignition lock assembly, ormisalignment with the remote coded key contact may occur resulting in intermittent or no engine cranking orstarting.

Figure 12J-1-25

SYSTEM OVERVIEW

THEFT DETERRENT SYSTEMBATTERY POWER A6

TURN SIGNAL POWER B5

KEY READER D12

IGNITION SWITCH ON D6

DRIVER'S DOOR OPEN C8

B4 RH TURN SIGNAL

A8 THEFT DETERRENT

B12 LH TURN SIGNAL

REMOTE RECEIVER

SERIAL DATA D2

PCM

BODY

CONTROL

MODULE

CIRCUIT OPERATION(Refer to Fig. 12J-1-30)

BATTERY POWER(Refer to Fig. 12J-1-26)Battery voltage is applied to the BCM microprocessor from terminal A6 at all times from fusible link FS and fuse F31via circuit 740 (Orange/Black wire).

INDICATORS POWER(Refer to Fig. 12J-1-26)Battery voltage is applied to BCM terminal B5 at all times from fusible link FJ and fuse F7 via circuit 140(Orange/Red wire).

INPUTSIGNITION SWITCH ON INPUT SIGNAL(Refer to Fig. 12J-1-26)The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in the IGN or START position, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-26

BCM AND ENGINE CONTROL MODULE COMMUNICATION (SERIAL DATA)(Refer to Figs. 12J-1-27 and 12J-1-28)When the ignition switch is turned to the ON position, the BCM polls the PCM and sends a security code. The PCMcompares this code with it’s stored code and if they match, the PCM will enable fuel system control and continueengine cranking.The serial data from the remote coded key is applied to BCM terminal D12, circuit 229 (Violet/Red wire).

Figure 12J-1-27

Figure 12J-1-28

DRIVER'S DOOR JAMB SWITCH(Refer to Fig. 12J-1-29)The BCM uses this input signal to determine if the driver's front door is opened or closed. The BCM must sense thatthe driver's door is closed before the theft deterrent system can be actively armed.When the door is opened, the jamb switch earth’s terminal C8 via circuit 126 (Grey/White wire). This causes thevoltage at terminal C8 to be pulled low, less than 0.2 volts (driver's door open). This low voltage at terminal C8 isseen by the BCM as the driver's door open input signal.

Figure 12J-1-29

Figure 12J-1-30

OUTPUTS

LEFT HAND INDICATORSThe BCM controls the operation of the left hand indicators by pulsing its internal indicator relay. This causes theindicator relay contacts to close and open a number of times. This allows battery voltage from terminal B5 to beapplied internally to terminal B12, to the left hand indicator lamps via circuit 14 (Light Blue wire).

RIGHT HAND INDICATORSThe BCM controls the operation of the right hand indicators in the same manner as the left hand indicators. Pulsingof its internal indicator relay causes the indicator relay contacts to close and open a number of times. This allowsbattery voltage from terminal B5 to be applied internally to terminal B4, to the right hand indicator lamps via circuit15 (Blue wire).

THEFT DETERRENT ALERT INDICATOR LEDThe theft deterrent alert indicator LED will continuously flash on and off whenever the system is armed. The BCMcontrols the operation of the theft deterrent alert indicator LED by pulsing an internal switch on and off, which in turnswitches the voltage applied to the theft deterrent alert indicator LED via terminal A8, circuit 263 (Light Blue wire).

1.5 HEATED REAR WINDOW CONTROLGENERAL INFORMATIONThis system imposes a time limit on the demisting of the rear window in order to maintain a higher state of charge ofthe vehicle battery. Driver control of the demister is from the heated rear window switch located in the instrumentfacia. Pressing of this momentary contact switch will toggle the heating element in the rear window on and off. Theheating is allowed to continue for 15 minutes and each new activation of the heated rear window switch resets thedelay timer.The demisting of the rear window is only allowed when the ignition is ON, and defaults to the OFF state when theignition is switched from OFF to ON.Control of the demister is via the heated rear window relay (located inside the vehicle, attached to the fuse panel)which is in parallel with the heated rear window indicator warning lamp in the instrument cluster.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BODY

CONTROL

MODULE

HEATED REAR WINDOW CONTROL

IGNITION SWITCH 'ON' D6

HEATED REAR WINDOWSWITCH D20

A1 HEATED REAR WINDOW RELAY & INDICATOR

BATTERY POWER A6

CIRCUIT OPERATION(Refer to Fig. 12J-1-32)HEATED REAR WINDOW SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-31)Pressing the heated rear window switch causes the contacts in the switch to close, connecting BCM terminal D20through circuit 291 (Blue/Orange wire) to ignition, circuit 44 (Pink/Blue wire). This action causes the voltage atterminal D20 to be pulled high, greater than 3.5 volts. This high voltage at terminal D20 is seen by the BCM as theheated rear window switch input signal.

Figure 12J-1-31

The BCM controls the operation of the heated rear window by the timer circuit turning on a transistor which thenearth’s the heated rear window relay pull-in coil circuit through BCM terminal A1, circuit 292 (Black/Red wire). Thiscauses the heated rear window relay contacts to close and battery voltage from fuse F22 circuit 40 (Orange wire) tobe applied to the heated rear window circuit 192 (Violet/Red wire). The earth circuit for the heated rear window isthrough circuit 185 (Black wire).Power is supplied to the rear window relay coil by the IGN output of the ignition switch, circuit 44 (Pink/Blue wire) viafuse F13. The demisting of the rear window is only allowed when the ignition is ON and defaults to OFF when theignition is switched from OFF to ON.

Figure 12J-1-32

1.6 POWER WINDOW SYSTEM

GENERAL INFORMATIONThe BCM controls the following functions of the power window system:1. Control of positive supply to all door window motors.2. Automatic down of driver's door window (activated when the driver's power window switch DOWN button is

depressed for more than 0.4 seconds).Once activated, the automatic down feature is cancelled within 100 ms (0.01 second) after:a. The driver's power window switch UP button is depressed following which the window will move upward (if up

button is held) or:b. The driver's power window switch DOWN button is depressed (the window will stop when the down button is

released).c. With ignition on, power is supplied continuously to the window system.d. When ignition is switched OFF and no door has been opened, power is supplied to the window system for a

maximum of 60 minutes.e. In the event of any door being opened, power is supplied to the system for 45 seconds maximum, timed from

when any door was opened.When the doors are remotely unlocked (by using the remote coded key) power is supplied to the system for a60 minutes and for a maximum of 45 seconds, once any door has been opened and the ignition has not beenturned ON. The delay is cancelled when the doors are locked by the remote coded key.

NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM CHECKPREREQUISITE CONDITIONThe child safety switch must be switched OFF. Thiswill be indicated by the green light emitting diodes(LED) in each of the rear door rocker switches beingilluminated.

SYSTEM ACTIVESystem active is indicated by the illumination of therocker switches.When the ignition switch is turned ON, all switchesare active.With the ignition switch turned OFF, all switches willremain active for 45 seconds after any door isopened.With the ignition switch turned OFF, all switches willremain active for approximately 60 minutes,PROVIDED THERE ARE NO OPEN DOORS.

Figure 12J-1-33

SYSTEM INACTIVELights are not illuminated.AUTOMATIC DOWN OPERATION OF DRIVER’SWINDOWWith the driver’s window in the fully UP position andthe ignition switch turned to ON, press the driverwindow switch to the window DOWN position formore than 0.5 seconds and release.The window will continue to lower automatically untilthe fully DOWN position is reached.To interrupt this function, press the UP buttonmomentarily.

Figure 12J-1-34

CHILD SAFETY SWITCHWhen the child safety switch (override switch) isOFF, the rear windows can be opened or closed fromthe centre console switch assenbly or the rockerswitches in each of the rear doors.To check the operation of this feature, proceed asfollows:1. Ignition switched to ON.2. Check that the green LED in each of the rear

door rocker switches is illuminated.3. Open and close the rear door windows using the

rocker switches in the rear doors.4. Press the child safety switch button in the centre

of the switch assembly in the console as shownin Fig. 12J-1-35.

5. Check that the green LED in each of the reardoor rocker switches extinguishes and that therear windows can only be raised or lowered fromthe switch in the centre console.

Figure 12J-1-35

SYSTEM OVERVIEW

BATTERY POWER A6

BODY

CONTROL

MODULE

REMOTE RECEIVER

POWER WINDOW SYSTEM


DRIVER'S DOOR JAMBSWITCH C8

DRIVER'S WINDOW DOWNSWITCH C14

DRIVER'S WINDOW UPSWITCH C16

PASSENGER DOOR JAMBSWITCHES C7

DRIVER'S WINDOW RELAY B2

POWER WINDOW RELAY A3

CIRCUIT OPERATIONA permanent magnet motor operates each of the power window mechanisms to raise or lower the window glass.The direction in which the motor turns depends on the polarity of a voltage supplied to its terminals. The powerwindow switches, located in the centre console, or in the rear doors, control the polarity of the supply voltages.The BCM has two main control functions in the power window system.1. To control the operation of the power window relay and hence, power supply to the whole system.2. To control the operation of the driver's side front window motor.OPENING WINDOW - DRIVER'S DOOR(Refer to Fig. 12J-1-38)

IGNITION ON INPUT SIGNAL(Refer to Fig. 12J-1-36)The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in the IGN or START position, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire).When the BCM receives an ignition on input it energises the power windows relay [voltage supplied by fuse F20circuit 440 (Orange/Violet wire)] by earthing the relay’s pull-in coil via circuit 173 (yellow wire) and BCM terminal A3.With the relay coil energised, the relay contacts close and power via fusible link FJ and circuit breaker F1 is appliedto the power window switches and each of the lights of the window switches (for rear door window switches, thepower window override switch in the RHF power window switch must be OFF). The opposite side of each light isconnected to earth, therefore the lights are illuminated (system active).By depressing and releasing the driver's front window switch down button within 0.4 of a second (so as not toengage the automatic down feature), this allows battery voltage from the power windows relay, circuit 1240(Orange/Yellow wire) and the power window switch terminal 4, through to terminal 8 and then BCM terminal C14(window down signal input).The opposite side of the motor is connected to earth on circuit 672 (Blue/White wire) via power window switchterminals 9 and 5 to circuit 156 (Black/Blue wire). This causes the motor armature to rotate, operating the windowregulator to lower the window.As described under power windows general information, the driver's window will automatically travel fully downwardprovided the power window switch down button is depressed for more than 0.4 seconds. The BCM microprocessorsenses the time the down button is depressed via terminal C14 and energises the external relay so as to allow thewindow to lower fully. The BCM senses this down signal and activates BCM terminal B2 to energise the driverswindow relay. Power is then fed through the relay (via circuit 673) and terminals 9 and 5 on the power windowswitch.

Figure 12J-1-36DRIVER'S FRONT WINDOW DOWN SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-37)With the driver's front window switch down button depressed, battery voltage from the power windows relay, circuit1240 (Orange/Yellow wire), and the power window switch terminal 4, through to terminal 8 is applied to BCMterminal C14 (window down signal input).

Figure 12J-1-37

When the BCM receives a driver's front window down switch input signal it energises an external relay. This causesthe relay contacts to changeover, allowing battery voltage from the power windows relay contacts, to one side of thedriver's side power window motor on circuit 673 Green/Orange wire.If the window is travelling downward and the down button is again depressed, the BCM microprocessor senses this(voltage again sensed at BCM terminal C14) and de-energises the external relay, the contacts open and the motorstops when the button is released.Should the up button be momentarily depressed whilst the window is travelling downward, positive battery supplyconnection is on both sides of the motor armature and the motor stops. If the up button is depressed whilst thewindow is travelling downward, the window down function is cancelled. The window will then move upward asdescribed in the following text.

Figure 12J-1-38

CLOSING WINDOW(Refer to Fig. 12J-1-40)

DRIVER'S FRONT WINDOW UP SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-39)By depressing and holding down driver's front window up button, battery voltage from the power windows relay oncircuit 1240 (Orange/Yellow wire) is applied, via power window switch terminals 4 and 9, to the driver's side powerwindow motor on circuit 672 (Blue/White wire).The opposite side to the motor on circuit 673 (Green/Orange wire) is connected to earth via the drivers windowrelay, terminals 3 and 4 to earth on circuit 150 (Black wire). This causes the motor armature to rotate, operating thewindow regulator to raise the window as long as the power window switch up button is depressed.

Figure 12J-1-39

WINDOW OPERATION - PASSENGER DOORSPower is supplied to all the power window switches from the power window relay (to the rear door switches providedthe power window override switch is off). If the power window override switch is on, (contacts between terminals 4and 12 are open) the power supply to the rear door power window switches is interrupted.With the switch buttons at rest, all switch contacts are connected to earth, circuit 156 (Black/Blue wire). Bydepressing the appropriate passenger's window switch down or up button, battery voltage from the power windowsrelay, is applied to one side of the window motor, via the depressed switch button contact. With the other side of themotor connected to earth, the motor armature will rotate, operating the window regulator to raise or lower thewindow as long as the window switch button is depressed.

Figure 12J-1-40

1.7 ENGINE COOLING FAN, LOW SPEED CONTROLNOTE:The circuit diagrams shown in this GeneralDescription Section are to aid in interpreting theoperation of the circuit and therefore, only the mainconnectors and wiring colours are shown. Forcomplete circuits details, refer to either the relevantdiagnostic section or Section 12P WIRINGDIAGRAMS.

SYSTEM OVERVIEW

BATTERY POWER A6

BODY

CONTROL

MODULE

A3 SERIAL DATA D2PCM

A/C REQUEST

VEHICLE SPEED

B7 ENGINE COOLING LOWSPEED FAN RELAY

ENGINE COOLANT TEMPERATURE

GENERAL INFORMATION(Refer to Figs. 12J-1-41 and 12J-1-42)There are two, two speed electric engine cooling fan assemblies that provide the primary means of moving airthrough the engine radiator. These fans are placed between the radiator and the engine and have their own shroud.These fans are used on all vehicles even if they are not equipped with air conditioning. There is no fan in front of theA/C condenser.Two, two speed electric engine cooling fans are used to cool engine coolant flowing through the radiator, and iffitted, refrigerant flowing through the A/C condenser. The engine cooling fan motors have four terminals, twonegative and two positive terminals. The two positive terminals are permanently connected to battery voltage. Whenone of the negative terminals is earthed, the fan motors will operate at low speed. When both negative terminals areearthed, the fans will operate at high speed.The two speed electric fan's low speed can be enabled when the low speed engine cooling fan micro relay (locatedin the engine compartment relay housing) is energised by the BCM via a request from the Powertrain ControlModule (PCM). The PCM will request low speed fan enable and disable via serial data communication to the BCMon circuit 1221 (Red/Black wire). After the PCM requests a change in the state of the low speed relay (ie. OFF toON or ON to OFF), the BCM will send a serial data response message back to the PCM confirming it received themessage. A failure in this response communication will set a PCM DTC.

Figure 12J-1-41

The engine cooling low speed fan relay is energised by the BCM earthing terminal B7, circuit 473 (Orange/Blackwire). This causes the relay contacts to switch over from 30-87A to 30-87 and is connected to earth via circuit 157(Black/Pink wire), is earthed through the relay and to the low speed fan terminal on circuit 533 (Blue/Yellow wire).The other low speed fan terminal is connected to battery voltage via circuit 204 (Orange wire) on FAN 1 and circuit208 (Yellow wire) on FAN 2.The PCM determines when to enable the low speed fan relay based on inputs from the A/C request signal, CoolingTemperature Sensor (CTS) and the Vehicle Speed Sensor (VSS).The low speed cooling fan relay will be turned ON' when:• A/C request indicated (YES) and the vehicle speed is less than 30 km/h.

- OR -• A/C pressure is greater than 1500 kPa.

- OR -• Coolant temperature is greater than 104ºC. (V6) or 95ºC. (V8)

- OR -• If the engine cooling temperature is above 117ºC when the ignition switch is turned OFF, the relay is energised

for approximately 4 minutes. This is known as ‘LOW FAN RUN ON’.• If an engine coolant temperature sensor fault is detected, such as DTC 14, 15, 16 or 17.The PCM will request the BCM to switch off the low speed cooling fan relay when the following conditions havebeen met:• Coolant temperature less than 99ºC. (V6) or 90ºC. (V8)• A/C request not indicated (NO). - OR -• Coolant temperature less than 99ºC.• A/C request indicated (YES) and the vehicle speed greater than 50 km/h.• A/C pressure is less than 1170 kPa.

Figure 12J-1-42

1.8 AUTOMATIC LIGHT CONTROL

GENERAL INFORMATIONThe automatic light control (lights off) feature is designed to automatically switch the headlamps and parking lampsoff when the driver leaves the vehicle.NOTE:Since this system is safety related, it is mandatory that in the event of a system failure, the default status of theBCM light control output is in the on state when the ignition switch is in the IGN position. This will give direct controlof the lights to the headlamp switch.The sequence of events required to switch the lights off automatically is as follows:1. The vehicle road speed input to the BCM indicates speed is less than 10 kilometres per hour and there has not

been a sudden loss of speed (ignition being switched OFF with the vehicle travelling above 10 km/h).2. The BCM senses that the ignition switch is turned from ON to OFF and remains in the off position.3. The headlamp switch has not been turned on after the ignition switch was turned off.4. The BCM senses the driver's door has been opened and turns the lights off.When the ignition switch is turned back to IGN position, the lights will turn back on to the position selected by theheadlamp switch and the mode of headlamps operation [ie. high or low beam or fog lamps (if fitted)] determined bythe position of the relevant switches.Turning the headlamp switch off deactivates the auto lights system.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.


POWER SUPPLIESBattery voltage is applied to the low, high beam and fog lamp (if fitted) relays from fusible link FQ, circuit 2 (Redwire) and fuses F29 and F30.Battery voltage is applied to the parking lamp relay from fusible link FQ circuit 2 (Red wire) and fuse F4, circuit 840(Orange/White wire).The BCM controls the operation of the exterior light circuits by enabling its internal control circuit, which provides theearth circuit for the relays.

H BEAM RELAY EARTH CIRCUITThe earth circuit for the high beam headlamp relay is via circuit 10, (Blue/Yellow wire), through the headlamp andturn signal control (flash/dip) switch assembly, circuit 147 (White/Black wire), headlamp switch contacts to BCMterminal D14, circuit 1150 (Black wire) and then to earth through internal switching.

BEAM RELAY EARTH CIRCUITThe earth circuit for the low beam headlamp relay is via circuit 103 (White wire), through the headlamp and turnsignal control (flash/dip) switch assembly, circuit 147 (White/Black wire), headlamp switch contacts to BCM terminalD14, circuit 1150 (Black wire) and then to earth through internal switching.

KING LAMP RELAY EARTH CIRCUITThe earth circuit for the parking lamp relay is via circuit 49 (Blue wire), the closed parking lamps contacts in theheadlamp switch, through BCM terminal D14, circuit 1150 (Black wire) and then to earth through internal switching.

Figure 12J-1-43

SYSTEM OVERVIEW

BATTERY POWER A6

BODY

CONTROL

MODULE

HEADLAMP SWITCH D14



VEHICLE SPEED SENSOR

SERIAL DATA MAIN D2

PCM

AUTO LIGHTS OFF

HEADLAMP RELAY D14

PARKING LAMP RELAY D14

HEADLAMP CONTROL INPUT SIGNAL(Refer to Fig. 12J-1-44)The BCM monitors the voltage on terminal D14 to determine the position of the headlamp and parking light switch.When the headlamps or parking lights are on, the voltage at BCM terminal D14 will be less than 0.2 volts. When theautomatic lights off system has turned the lights off, the voltage at terminal D14 will be 12 volts. If the light switch isturned off, the voltage at terminal D14 will be less than 0.2 volts. The BCM sees this low voltage at terminal D14 asa change in status of the light switch and will turn the auto lights system off. The lights will then turn back on with thechange in the position of the switch.

Figure 12J-1-44

DRIVER’S DOOR OPEN INPUT SIGNAL(Refer to Fig. 12J-1-45)When the driver’s door is opened, BCM terminal C8 is connected to earth via circuit 126 (White/Grey wire) and thedriver's door jamb switch. This causes the voltage at terminal C8 to pulled low, less than 0.2 volts (driver's dooropen). This low voltage at terminal C8 is seen by the BCM as the driver's door open input signal.

Figure 12J-1-45

VEHICLE SPEED SIGNAL(Refer to Fig. 12J-1-46)BCM terminal D2, serial data bus, is connected to the PCM via circuit 1221 (Red/Black wire). It is via the serial databus line that the BCM receives data relating to the speed of the vehicle.

Figure 12J-1-46

IGNITION SWITCH ON INPUT SIGNAL(Refer to Fig. 12J-1-47)The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in the IGN or START position, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-47

1.9 WIPER SYSTEM

GENERAL INFORMATIONThis system controls the front intermittent and rear wiper function. The wiper dwell on vehicles with low seriesBCM’s uses fixed dwell periods of approximately eight seconds (this is not adjustable). The rear wipers aresynchronised to the front wipers when the front wipers are in the intermittent wipe mode. Due to the different wipeaction between front and rear wipers, the rear wipe will start one quarter second before the front wipe. Additionally,the rear wiper will wipe continuously when the vehicle is put into reverse gear and the rear wiper switch is on(communication between the PCM and BCM via serial data bus). This option can be changed, via TECH 2, so therear wiper will wipe continuously when the vehicle is put into reverse gear and the front wiper switch is on.The front and rear wipers employ a ‘wipe after wash’ function where, if the relevant washer pump switch has beenpressed for more than 0.5 seconds, the wipers start sweeping at a low speed continuously until the washer pumphas been disengaged, following which, the wiper will be held on for a calculated time period so that the followingnumber of sweeps can be completed:

• 1 additional sweep if washer switch is pressed for less than 1 second.• 2 additional sweeps if washer switch is pressed for less than 1.5 second.• 3 additional sweeps if washer switch is pressed for more than 1.5 second

In order to correctly perform the number of additional sweeps, the wiper motor park switch is monitored. This allowsthe wiper supply power to be transferred to the park switch at the optimum time.NOTE: The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

WIPER MOTOR LOW SPEED A2

REAR WIPER MOTOR A4

FRONT AND REAR WIPER SYSTEMBATTERY POWER A6

BODY

CONTROL

MODULE

REAR WIPERSWITCH D7

FRONT WASHERSWITCH D18

FRONT WIPER INTERMITTENTSWITCH D10

WIPER MOTOR PARKSWITCH B9

SERIAL DATA MAIN D2

PCM

REVERSE GEAR (PSA)

REAR WASHER SWITCHSWITCH D19

CIRCUIT OPERATION(Refer to Figs. 12J-1-53 and 12J-1-54)

FRONT INTERMITTENT WIPER SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-48)Placing the wiper/washer switch in the intermittent (INT) position causes battery voltage, via fusible link FJ, theignition switch contacts, fuse F18, circuit 41 (Brown/Green wire) and the wiper washer switch INT contacts to beapplied to BCM terminal D10, circuit 97 (Blue/White wire). This voltage at D10 is seen by the BCM as theintermittent wiper input signal.

Figure 12J-1-48This then enables the BCM to energise the intermittent wiper relay. This causes battery voltage from fuse F18 to beapplied to the wiper motor low speed circuit, circuit 95 (Green wire), through the wiper switch terminals to, circuit 91(Grey/Red wire). This voltage will cause the wiper motor armature to rotate, which intern causes the wiper motorpark switch contacts to change over from A-B to A-C.Once the motor armature starts to rotate, battery voltage will be applied to BCM terminal B9 from fuse F18, circuit41 (Brown/Green wire), through the wiper motor park switch contacts (A and C) and circuit 196 (Yellow wire). Oncethe wiper motor enters its 'parked' region the wiper park switch contacts change over from A-C to A-B, BCMterminal B9 will now be connected to earth through circuit 196 (Yellow wire) the wiper motor park switch contacts A-B and circuit 152 (Black/White wire). This action causes the voltage at terminal B9 to go from battery voltage to lessthan 0.2 volts. This low voltage at B9 is seen by the BCM as the park switch input signal. The BCM will then turn offthe intermittent wiper relay and the wiper motor will stop rotating.

REAR WIPER SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-49)Placing the wiper washer switch in the rear wipe position causes battery voltage, via fusible link FJ, the ignitionswitch contacts, fuse F18, circuit 41 (Brown/Green wire) and the wiper washer switch rear contacts to be applied toBCM terminal D7, circuit 1391 (Grey/Red wire). This voltage at D7 is seen by the BCM as the rear wiper inputsignal.

Figure 12J-1-49

REAR WINDOW WASHER SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-50)When the rear washer pump switch is activated, battery voltage is applied to the washer pump and BCM terminalD19 from fuse F18, circuit 41 (Brown/Green wire), the washer switch contacts, circuit 494 (White/Blue wire). Thiscauses the voltage at BCM terminal D19 to go from less than 0.2 volts to 12 volts. This voltage is seen by the BCMas the rear washer switch input signal.

Figure 12J-1-50FRONT WINDOW WASHER SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-51)When the washer pump switch is activated, battery voltage is applied to the washer pump and BCM terminal D18from fuse F18, circuit 41 (Brown/Green wire), the washer switch contacts, circuit 94 (Light Blue wire). This causesthe voltage at BCM terminal D18 to go from less than 0.2 volts to 12 volts. This voltage is seen by the BCM as thewasher switch input signal. The length of time that this voltage is present at BCM terminal D18 will determine howmany additional wiper sweeps will occur.The BCM determines the number of sweeps the wipers have completed by monitoring the voltage at terminal B9,park switch input, as the voltage at B9 will go from 12 volts to less than 0.2 volts at the completion of each sweep.

Figure 12J-1-51

REVERSE GEAR INPUT SIGNAL(Refer to Fig. 12J-1-52)BCM terminal D2, serial data bus, is connected to the PCM via circuit 1221 (Red/Black wire). It is via the serial databus link that the BCM receives data relating the selection of reverse gear.

Figure 12J-1-52

Figure 12J-1-53

Figure 12J-1-54

1.10 DOME LAMP DELAY CONTROL

GENERAL INFORMATION(Refer to Fig. 12J-1-58)The interior lighting is controlled by the BCM or the dome lamp switch (incorporated in the overhead lamp/switchassembly). The interior lighting is activated when any door is opened, unlocked with the remote coded key, or whenthe dome lamp switch is operated.The interior lighting operates continuously whilst any door is open. After all doors have been closed, the lampremains active for an additional 30 seconds.If the lighting has been activated by a BCM control system or action, the dome lamp switch will turn the interiorlighting off when the dome lamp switch is switched from DOOR to OFF. This means that the switch can curtail anydelay time initiated as well as switch the lighting off whilst a door is open. With the dome lamp switch in the ONposition, BCM control of the interior lighting is overridden.The interior lighting is switched on upon central door unlocking for 30 seconds. If the ignition is turned on during thisdelay, the interior lighting will be switched off immediately. Interior lighting is also switched off upon central doorlocking, except if the dome lamp switch is turned on or if a passenger door is open. It will then be extinguishedwhen all doors are closed.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BODY

CONTROL

MODULE

C24 DOME LAMP

DOME LAMP DELAY

BATTERY POWER A6


REMOTE RECEIVER D1

PASSENGER DOOR JAMBSWITCHES C7


CIRCUIT OPERATIONBattery voltage is applied to all interior lamps via fuse F6 and circuit 1140 (Orange/Black wire). The opposite side ofthe dome lamps are connected to earth via circuit 174 (White/Green wire) and BCM terminal C24. The BCMcontrols the operation of the dome lamps connected to this earth by energising its internal dome lamp relay contactsto close, completing the circuit to earth.

IGNITION SWITCH ON INPUT SIGNAL(Refer to Fig. 12J-1-55)The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in either of these positions, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-55

PASSENGER DOOR OPEN INPUT SIGNAL(Refer to Fig. 12J-1-56)When any passenger door is opened, BCM terminal C7 is connected to earth via circuit 125 (White wire) and thepassenger door jamb switch. This causes the voltage at terminal C7 to be pulled low, less than 0.2 volts (passengerdoor open). This low voltage at terminal C7 is seen by the BCM as the passenger door open input signal.

Figure 12J-1-56

DRIVER’S DOOR OPEN INPUT SIGNAL(Refer to Fig. 12J-1-57)When the driver’s door is opened, BCM terminal C8 is connected to earth via circuit 126 (Grey/White wire) and thedriver’s door jamb switch. This causes the voltage at terminal C8 to be pulled low, less than 0.2 volts (driver’s dooropen). This low voltage at terminal C8 is seen by the BCM as the driver’s door open input signal.

Figure 12J-1-57

Figure 12J-1-58

1.11 AIR CONDITIONING INTERFACEGENERAL INFORMATIONThe air-conditioning interface is used to turn the air conditioning system on and off. The BCM reads the momentaryair conditioning switch signal, monitors fan speed and, if the ignition is on, then requests the PCM to turn on the airconditioning compressor, via the serial data bus, normal mode message The air conditioning status LED is turnedon by the BCM when the air conditioning system is active (if the ignition is turned on) and will toggle with the airconditioning select switch. The status will be remembered when the ignition is switched from ON to OFF or whenthe blower is off but will reset to off when the battery is disconnected. If the blower is off and the air conditioningselect button is pressed, then the next time the blower is switched on, the air conditioning status will also come on.Turning the ignition off will cancel this button press function.The blower fan is controlled by the blower fan inhibit relay, which suspends blower fan operation during cranking(via the accessories feed to this control relay). The BCM blower inhibit relay control output will only allow operationwith the ignition in the ON position and therefore, inhibit the operation of this relay while the ignition switch is in theACC position.NOTE 1:The BCM has provision for an air conditioning thermostat to prevent the evaporator from icing up. In the absence ofthis thermostat, the input is connected to ignition.NOTE 2:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

IGNITION SWITCH D6

BCM

BLOWER FAN B3

AIR CONDITIONING SWITCH D9

BATTERY POWER A6

AIR CONDITIONING INTERFACE

B8 AIR CONDITIONING STATUS LED

B1 AIR CONDITIONING INHIBIT RELAY

D2 SERIAL DATAMAIN


AIR CONDITIONING SWITCH INPUT SIGNAL(Refer to Fig. 12J-1-59)Activating the air conditioning switch causes battery voltage, via the ignition switch contacts, fuse F13 circuit 44(Pink/Blue wire) and the air conditioning switch to be applied to BCM terminal D9. This voltage is seen by the BCMas the air conditioning switch input signal.

Figure 12J-1-59

BLOWER MOTOR INPUT SIGNAL(Refer to Fig. 12J-1-60)The blower motor input signal monitors the operating state of the blower motor. When the blower motor is runningthe BCM input B3 is pulled to ground via circuit 359 (Dark Green/Yellow wire), the blower switch, circuit 251(Orange/Green wire) and the blower inhibit relay. This will cause the voltage at BCM terminal B3 to go from batteryvoltage to less than 0.3 volts. This low voltage is seen by the BCM as meaning the blower is on.

Figure 12J-1-60

IGNITION SWITCH ON INPUT SIGNAL(Refer to Fig. 12J-1-61)The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When theignition switch is in the IGN or START position, battery voltage is applied to the BCM terminal D6 from the ignitionswitch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-61

Figure 12J-1-62

1.12 CRUISE CONTROL INTERFACE

GENERAL INFORMATIONThe cruise control module uses an input on the BCM to send a serial data message to the instruments.When the cruise control module is powered up via the cruise control on/off switch the cruise control moduleactivates an input of the BCM. The BCM sees this line as active and sends a serial data message to the instrumentcluster to turn it’s ‘cruise on’ lamp on.NOTE:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

B

C

M

CRUISE CONTROL INTERFACE

BATTERY POWER A6

D3 SERIAL DATAIGNITION SWITCH ON D6

CRUISE ON D8 INSTRUMENTS CRUISE ON LAMP

CIRCUIT OPERATION(Refer to Figs. 12J-1-63 and 12J-1-64)When the cruise control is turned on, the cruise control module activates its cruise ‘on’ output to the BCM. The BCMinput D8, circuit 83 (Grey wire) rises from less than 0.2 volts to approximately battery voltage. When this happens,the BCM senses this as a ‘cruise on’ signal and communicates (via the auxiliary serial data bus) with theinstruments to turn the ‘cruise on’ lamp.

Figure 12J-1-63

Figure 12J-1-64

1.13 SRS DEPLOYMENT VEHICLE SHUTDOWN

GENERAL INFORMATIONIn the event of SRS (Supplemental Restraint System) deployment, the Sensing Diagnostic Modules (SDM) will sendserial data via the auxiliary serial data bus to advise various vehicle systems to take appropriate shutdown action.The BCM will monitor this serial data (via the auxiliary serial data bus), and perform the following actions once theappropriate data is identified and the vehicle speed is zero km/h for longer than 10 seconds:

• Turn the dome lamp on continuously• Unlock all doors

The dome lamps will be switched off when the ignition switch is cycled from off to on or when the BCM is reset (ie.the battery is disconnected).NOTE 1:The PCM (Powertrain Control Module) also monitors this serial data, and performs a vehicle shut down once theappropriate data is identified and the vehicle speed is zero km/h for longer than 10 seconds.NOTE 2:The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuitand therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to eitherthe relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BATTERY POWER A6

DOOR LOCK POWER B10


C24 DOME LAMP

C26 DOOR UNLOCKDRIVE

C12 DOOR DEADLOCKDRIVE

C3 DRIVER'S DOORUNLOCK DRIVE

SRS SERIAL DATA AUX. D13

SERIAL DATA AUX. D3

SERIAL DATA MAIN D2

BODY

CONTROL

MODULE

SRS VEHICLE SHUTDOWN SYSTEM

CIRCUIT OPERATIONSRS SERIAL DATA BUS (SERIAL DATA)(Refer to Fig. 12J-1-65)In the event of SRS deployment, the SDM will send serial data via serial data bus to the BCM, where a physical linkto the serial data auxiliary bus enables the SDM to advise various systems, via serial data, to take appropriateaction. This includes the BCM.

Figure 12J-1-65

2. SERVICE OPERATIONS

2.1 SAFETY AND PRECAUTIONARY MEASURES1. Whenever performing any electric welding on a vehicle, disconnect wiring harness connectors from the BCM.2. Never subject the BCM to temperatures above 85°C, (eg. paint oven), always remove BCM first if this

temperature is to be exceeded.3. Ensure that all wiring harness connectors are connected solidly and that battery terminals are thoroughly clean.4. When charging the battery, disconnect it from the vehicle's electrical system.5. Never connect or disconnect the BCM wiring harness connectors when the ignition is switched ON.6. Never disconnect the battery from the electrical system while the engine is running.7. Reconnecting battery cable terminals to the battery will cause a reset.

2.2 LOW SERIES BCM

REMOVE1. Disconnect battery earth lead.2. Remove right hand instrument panel lower trim assembly, refer to Section 1A3 INSTRUMENT PANEL.3. Remove BCM from mounting brackets by pushing the bottom of the BCM towards the front of the vehicle until

the BCM disengages from the lower mounting bracket. Then by grasping the BCM, gently pull the BCM down(remembering that the wiring harnesses are still connected), disengaging it from the upper mounting bracket.Refer to Fig. 12J-1-66.

4. Depress tangs on wiring harness connectors on BCM and pull connectors from module.NOTE:If carrying out BCM diagnostic checks as described in the appropriate diagnostic test in this Section, leave all wiringharness connectors installed in the BCM. If required, reconnect battery earth lead.

REINSTALLInstallation of the BCM is the reverse of the removal procedure, ensuring that the BCM is firmly installed in the BCMmounting brackets.

BCM LINK TO PCMConnect TECH 2 to DLC and select the following:Diagnostics / (V) 1997 / VT Commodore / Body / Body Control Module / Security / BCM Link to PCM and followTECH instructions.For additional information regarding TECH 2 and TECH 2 test modes (including this linking procedure), refer to 3 TECH 2 DIAGNOSIS FOR BCM in this Section.

Figure 12J-1-66

2.3 REMOTE CODED KEY

PERFORMANCE CHECKDuring a performance check of the remote coded key, be sure to check all keys that are assigned to the vehicle.Two checks have been incorporated in the TECH 2 software. These two checks include a REMOTE KEY SIGNALtest that is used for checking the RF output and if the signal is recognised by the BCM. The second check is theREMOTE KEY I.D. which is used to check if a remote coded key has been assigned to the BCM.For more details on these TECH 2 checks, refer to 3.3 TECH 2 SCREEN DISPLAYS in this Section.Check that the remote coded key can successfully lock and unlock the doors at a distance of approximately fourmeters from the vehicle.If one remote coded key fails to make the system respond, the problem is in that particular remote coded key.After replacing a key due to a suspected discharged or faulty battery, first insert the key into the ignition and cyclefrom OFF - ON - OFF. This is necessary as there may be a need to synchronise the rolling codes between theremote coded key and the BCM. If the codes are not synchronised, the remote control of the central door lockingsystem will not work.

REPLACENOTE 1:Before replacing a suspected faulty remote control key, ensure the following steps are carried out.

• Carry out the Remote Control Function Fault Diagnosis as per the diagnostic chart in this Section.• If the key still presents a problem, ensure that the key pin is making contact with the remote coded key reader

assembly. Insert the key into the ignition and cycle from OFF - ON - OFF. This is necessary as there may bea need to synchronise the rolling codes between the remote control key and the BCM. The remote coded keywould only be considered faulty if it will not allow the engine to start when used in the ignition switch with thetheft deterrent system armed (LED flashing).

Avoid testing the remote coded key with the system disarmed (LED not flashing), in this situation, a faulty remotecoded key will allow the engine to start, being in the 30 second time frame before the system passively arms itself.

NOTE 2:Replacement of a remote coded key will necessitate programming with the BCM to accept the new remote codedkey serial output data. The programming of the remote coded key can only be performed by an authorised Holdenservice outlet or authorised locksmiths when provided with the correct security information.1. Loosen and remove the two remote coded key housing screws.2. Grab hold of key tip and pull it from the remote coded key housing.3. While holding new remote coded key housing, loosen and remove the remote coded key housing screws.

Assemble the key into the new remote coded key housing.4. Insert the two remote coded key housing screws and start threads by hand. Tighten screws to the correct

torque specification (to complete earth circuit within key).

REMOTE CODED KEY HOUSINGSCREW TORQUE SPECIFICATION

0.7 - 0.9Nm

5. Carry out programming of remote coded key.6. Insert remote coded key into the ignition and cycle from OFF - ON - OFF to synchronise codes.7. Carry out check of theft deterrent and central door locking systems using the remote coded key.

NOTE 3:The remote control key is a sealed for life unit (non removable battery), therefore the housing cannot be separated.The battery life expectancy is approximately five to ten years.

NOTE 4:To protect the electric door lock actuators from overheating if/when the door locks are operated repeatedly insuccession, the BCM is programmed to prevent door lock operation for a short period (maximum 20 seconds). Thisis normal operation and not to be confused as a defective remote coded key or BCM.

2.4 REMOTE CODED KEY READER

REMOVE1. Release steering column height adjuster lever

and completely lower steering column, locklever in this position.

CAUTION: Disable the SRS (Air Bag), refer to in Section12M SUPPLEMENTAL RESTRAINT SYSTEM.2. Remove the ignition key from the ignition

switch. 3. Remove steering column upper and lower

covers, refer to Section 9A STEERING.4. Disconnect wiring harness connector and

ignition lock illumination socket and bulb fromkey reader assembly, then carefully pull keyreader assembly from ignition lock assemblyhousing.

Figure 12J-1-67

REINSTALLInstallation of the remote key reader assembly isthe reverse of the removal procedure, noting thefollowing points:1. Align the flat sections of the remote key reader

assembly with the ignition lock assembly, referto Fig. 12J-1-68.

Figure 12J-1-682. Gently press key reader assembly onto ignition

lock by pushing on the centre of the keyreader, in between the two contact strips, untilkey seats onto the ignition lock, Fig. 12J-1-69.

3. Ensure that the wiring harness connector andignition lock illumination bulb and socket aresecurely fitted onto key reader assembly.

4. On completion of reinstallation, insert theignition key and check the key readerassembly operation.

NOTE: Enable the SRS (Air Bag), refer to Section 12MSUPPLEMENTAL RESTRAINT SYSTEM.

Figure 12J-1-69

2.5 REMOTE RECEIVER MODULE

REMOVE 1. Remove LH and RH demist grilles, refer to

Section 1A3 INSTRUMENT PANEL.2. Gently pry the front of the remote receiver

module up and towards rear of vehicle.

Figure 12J-1-703. Disconnect wiring harness connector.4. Remove wiring harness retaining clip from

remote receiver module by squeezing tangs ofclip together and pushing clip through sunsensor / remote receiver module aperture.

5. Remove remote receiver module.

REINSTALLInstallation of the remote receiver module is thereverse of the removal procedure.

Figure 12J-1-71

2.6 DOOR LOCK ACTUATORSFor the procedure on how to remove, reinstall and test the door lock actuators, refer to Section 1A5 FRONT ANDREAR DOOR ASSEMBLIES.

2.7 DOOR LOCK MICROSWITCHESOn VT Series Models, there are two door lockmicroswitches that are fitted to the drivers doorexterior handle. The microswitches are part of thedriver’s door exterior handle assembly and are notserviced separately. Therefore, to remove theexterior door handle and microswitch assembly,refer to Section 1A5 FRONT AND REAR DOORASSEMBLIES.

TEST 1. Remove door inner trim panel, refer to

Section 1A5 FRONT AND REAR DOORASSEMBLIES.

2. Using an ohmmeter connected to the variousterminals, check operation of themicroswitches as per the follow table:

NOTE: If any of the readings are not as specified, replacethe exterior door handle and microswitch assembly,refer to Section 1A5 FRONT AND REAR DOORASSEMBLIES.

Figure 12J-1-72

LOCK POSITION TERMINALS (WIRECOLOURS)

VALUE

Rest position Brown/Red to Brown/White

Brown/Red to Brown

Brown/White to Brown

Open circuit

Open circuit

Open circuit

Held in lock position Brown/Red to Brown

Brown/Red to Brown/White

Continuity

Open circuit

Held in unlock position Brown/Red to Brown/White

Brown/Red to Brown

Continuity

Open circuit

2.8 TAILGATE & REAR COMPARTMENT LID ACTUATORSFor the Procedure on how to remove and reinstall the tailgate lock actuator and rear compartment deck lid actuator,refer to Section 1A4 REAR COMPARTMENT LID AND TAILGATE.

2.9 THEFT DETERRENT LEDThe theft deterrent LED is incorporated into the trip computer module in the instrument panel facia and therefore,not serviced separately. For the Procedure on how to remove and reinstall the trip computer module, refer to Section 12C INSTRUMENTS, WIPERS, WASHERS & HORN.

2.10 DOOR JAMB SWITCHESThe door jamb switches are installed in each of thedoor hinge pillars. When the door of the vehicle isclosed, a plunger in the switch is depressed,creating an open circuit in the earth circuit. Whenthe door is opened, the plunger is released andcompletes the circuit to earth.

REMOVE1. Remove door jamb switch retaining screw (1).2. Remove door jamb switch (2) from door hinge

pillar, taking care not to damage the door jambswitch wiring harness.

3. Disconnect wiring harness connectors.

REINSTALLInstallation of the door jamb switches is the reverseof the removal procedure.

Figure 12J-1-73

2.11 HEADLAMP SWITCHFor the procedure on how to remove, test and reinstall the headlamp switch, refer to Section 12B LIGHTINGSYSTEMS.

2.12 HEADLAMP AND PARK LAMP RELAYSFig. 12J-1-74 shows the location of the park lampsrelay (located inside the vehicle, attached to thefuse panel). Access to the relay / fuse panel is by lowering theinstrument panel right hand cover assembly. Referto Section 1A3 INSTRUMENT PANEL for theprocedure on how to remove this cover.

Figure 12J-1-74Fig. 12J-1-75 shows the location of the headlamphigh and low beam relays (located inside theengine compartment relay housing).

Figure 12J-1-75

2.13 HEATED REAR WINDOW SWITCHFor the procedure on how to remove, test and reinstall the heated rear window switch, refer to Section 12CINSTRUMENTS, WIPERS/WASHERS & HORNS.

2.14 HEATED REAR WINDOW RELAYFig. 12J-1-76 shows the location of the heated rearwindow relay (located inside the vehicle, attachedto the fuse panel). Access to the relay / fuse panel is by lowering theinstrument panel right hand cover assembly. Referto Section 1A3 INSTRUMENT PANEL for theprocedure on how to remove this cover.

Figure 12J-1-76

2.15 IGNITION SWITCHFor the Procedure on how to remove and reinstall the ignition switch, refer to Section 9A STEERING.

2.16 VEHICLE SPEED SENSORMANUAL TRANSMISSIONFor vehicle speed sensor removal, testing and installation instructions, refer to Section 12C INSTRUMENTS,WIPERS/WASHERS & HORN.

AUTOMATIC TRANSMISSIONFor vehicle speed sensor removal, testing and installation instructions, refer to Section 6C1 ENGINE MANAGEMENT - V6 ENGINE or Section 6C2 ENGINE MANAGEMENT - V8 ENGINE.

2.17 POWER WINDOW MOTORSFor the procedure on how to remove and reinstall the power window motors, refer to Section 1A5 FRONT ANDREAR DOORS.

2.18 FRONT AND REAR DOOR POWER WINDOW SWITCH

REMOVE 1. Raise the centre console cap, refer to

Section 1A3 INSTRUMENT PANEL ANDCONSOLE.

2. From the rear of the centre console cap,push the tangs securing the power windowswitch and push the power window switchupward, releasing it from the console cap.

3. Depress wiring harness retaining tang anddisconnect wiring harness connector,remove power window switch.

TESTNOTE:Do not allow skin to contact the power windowcircuit board when checking for continuity.

Figure 12J-1-77

With the power window switch removed, using anohmmeter connected to the various terminals,check operation of the switch as per the followingtable:NOTE:If any of the readings are not as specified,replace the power window switch assembly.

Figure 12J-1-78

SWITCH POSITION TERMINALNUMBERS VALUERHF Up

Rest

Down

4 and 95 and 85 and 94 and 8

ContinuityContinuityContinuityContinuity

LHF UpRest

Down

4 and 145 and 1

5 and 144 and 1


RHR UpRest

Down



LHR UpRest

Down



Override InSwitch Out

4 and 134 and 13

Open circuitContinuity

REINSTALLInstallation of the front and rear door power windowswitch is the reverse of the removal procedure.

2.19 REAR DOOR POWER WINDOW SWITCHES

REMOVE1. From the rear of the rear door power window

switch, prise the appropriate switch from thedoor trim, taking care not to damage door trim.

2. Lift out rear door power window switch fromdoor trim until wiring harness connectorpasses out through console opening.

3. Depress wiring harness retaining tang anddisconnect wiring harness connector, removeswitch.

Figure 12J-1-79

TESTNOTE:Do not allow skin to contact the power windowcircuit board when checking for continuity.With the power window switch removed, using anohmmeter connected to the various terminals,check operation of the switch as per the followtable:NOTE:If any of the readings are not as specified, replacethe power window switch assembly.

Figure 12J-1-80

SWITCHPOSITION

TERMINALNUMBERS

VALUE

Up 1 and 3

2 and 4

Continuity

Continuity

Rest 1 and 3

2 and 5

Continuity

Continuity

Down 1 and 3

2 and 5

Continuity

Continuity

REINSTALLInstallation of the rear door power window switch isthe reverse of the removal procedure.

2.20 POWER WINDOW RELAYS AND CIRCUIT BREAKERFig. 12J-1-81 shows the location of the powerwindow relays and circuit breaker (located insidethe vehicle, attached to the fuse panel). Access to the relay / fuse panel is by lowering theinstrument panel right hand cover assembly. Referto Section 1A3 INSTRUMENT PANEL for theprocedure on how to remove this cover.

Figure 12J-1-81

2.21 ENGINE COOLING FAN LOW SPEED RELAYFig. 12J-1-82 shows the location of the enginecooling fan low speed relay (located inside theengine compartment relay housing).

Figure 12J-1-82

2.22 WINDSHIELD WIPER MOTORFor windshield wiper motor removal, testing and installation instructions, refer to Section 12C INSTRUMENTS,WIPERS/WASHERS & HORN.

2.23 WINDSHIELD WIPER/WASHER SWITCHFor the windshield wiper/washer switch removal, testing and installation instructions, refer to Section 12CINSTRUMENTS, WIPERS/WASHERS & HORN.

3. TECH 2 DIAGNOSIS FOR BCM

3.1 BASIC KNOWLEDGE REQUIREDBefore attempting to diagnose the control or assist of the various vehicle electrical systems controlled by the BCM,you must have a good understanding of electrical system basics and the use of circuit testing tools. Without thisbasic knowledge it will be difficult to use the diagnostic procedures detailed in this Section.Some electrical basics, troubleshooting procedures and hints as well as the use of circuit testing tools are coveredin Section 12P, WIRING DIAGRAMS.Basic Electrical Circuits - You should understand the basic theory of electricity, series and parallel circuits, andvoltage drops across series resistors. You should know the meaning of voltage (volts), current (amps), andresistance (ohms). You should understand what happens in a circuit with an open or shorted wire (shorted either tovoltage or earth). You should also be able to read and understand a wiring diagram.Use of Circuit Testing Tools - You should know how to use a jumper lead to test circuits. You should be familiar withthe use of a high input impedance (10 Megohm) digital type multimeter such as tool No. J39200 or equivalent andbe able to measure voltage, current, and resistance. You should be familiar with the proper use of the TECH 2Diagnostic Scan Tool.

3.2 CONNECTING TECH 2TECH 2, with the appropriate software, cables andadaptors, when connected to the Data LinkConnector (DLC) is capable of reading BCM serialdata. The DLC is connected to the instrument panellower right hand trim, to the right of the steeringcolumn. For additional general information onconnecting and operating TECH 2 , refer toSection 0C TECH 2.

Figure 12J-1-83TECH 2 has seven test modes for diagnosing theBCM. The seven test modes are as follows:Mode F0: Normal ModeIn this mode, the Tech 2 monitors thecommunication between control modules on theserial data line. The information displayed on theTECH 2 screen in this mode is what the BCM iscommunicating to the other modules via the serialdata line.Mode F1: Diagnostic Trouble CodesIn this test mode, current Diagnostic Trouble Codes(DTC’s) stored in the control modules memory maybe displayed or cleared.Mode F2: Data DisplayIn this test mode, TECH 2 displays the status ofinputs and outputs of the BCM.Mode F3: SnapshotIn this test mode, Tech 2 captures BCM databefore and after a forced manual trigger.Mode F4: Miscellaneous TestsIn this test mode, Tech 2 performs variousfunctional tests to assist in problem isolation duringtrouble shooting.Mode F5: ProgramIn this test mode, Tech 2 allows the programmingof various features by turning the feature OFF orON, or adjusting settings (ie. Two Stage Unlock).Mode F6: SecurityIn this test mode, Tech 2 provides the user with thecapability of: linking the PCM to the BCM, readingsecurity information (ie. radio pin numbers), andprogramming security features (ie. keys).

Figure 12J-1-84

3.3 TECH 2 TEST MODES AND DISPLAYS FOR BCM DIAGNOSISAs a prerequisite to this diagnostic section is for theuser to be familiar with the proper use of TECH 2,the following illustrates only the major TECH 2screen displays and provide a brief explanation oftheir function for diagnosing the BCM. If additionalinformation is required on the operation of TECH 2,reference should be made to either Section 0CTECH 2 or the TECH 2 OPERATORS MANUAL.

System Select MenuWith TECH 2 connected to the DLC and turned on,F0: DIAGNOSTICS selected from the MAINMENU, the correct MODEL YEAR and VEHICLETYPE must be selected for access to the SYSTEMSELECT MENU.Select F3: BODY.This mode contains all functions to test, diagnose,monitor and program the vehicles body systemsincluding the BCM as well as providing theopportunity to check all DTC’s that may be set inthe vehicle.

Figure 12J-1-85

Body Application MenuOnce F3: BODY has been selected from the selectmenu, BCM can be selected.Select Body Control Module and press enter tocontinue.NOTE:If information regarding DTC’s set for the vehicle isrequired, select DTC CHECK and press enter tocontinue. To return to the BCM mode option fromthe DTC CHECK mode option screen display,simply press the EXIT key on TECH 2.Once the BCM has been selected and entered, thefollowing two SYSTEM IDENTIFICATION screenswill appear which require action. Figure 12J-1-86

System IdentificationTurn the ignition ON (as requested) and pressCONFIRM soft key to continue.

Figure 12J-1-87

The SYSTEM IDENTIFICATION screen will thendisplay the control module level and type. Press theCONFIRM soft key to continue to the BCMAPPLICATION MENU.

Figure 12J-1-88

Application MenuThe following functions will now be available:F0: Normal ModeF1: Diagnostic Trouble CodesF2: Data displayF3: SnapshotF4: Miscellaneous TestsF5: ProgramF6: Security

Figure 12J-1-89

F0: NORMAL MODEIn the F0: Normal Mode, information that the BCM is communicating to other control modules, via the serial dataline, is displayed.The table below lists each item in the Normal Mode, together with a brief description of its meaning.

DATA STREAM /SCREEN DISPLAY

DESCRIPTION EXPECTED READING

Ignition Status Displays current state of ignition switch as sensed bythe BCM.

On 12 Volts / Off 0 Volts

Ignition Off Time Displays the length of time since the ignition was lastswitched off.

XX minutes

Instrument Lamps Displays instrument illumination level. 0 % / 100 %

Lights On Displays current status of headlamp switch. Yes / No

Ambient Light Level This feature is only available for vehicles with highseries BCM’s (Calais).

0

Boot Status Displays boot switch status. Open / Closed

Rear Lamp Status This feature is only available for vehicles with highseries BCM’s (Calais).

Okay

Front Wiper Status Displays front wiper drive status. On / Off

Front Auto wiper Status This feature is unavailable at present. Off

Cruise Control InputSignal

Displays cruise control status. On / Off

A/C Request (AirConditioning)

Displays A/C request status. On / Off

BCM Lower Fan Drive Displays low speed fan drive status. On / Off

BCM Chime (BodyControl Module)

This feature is unavailable at present. Off

Key User Displays which remote coded key is in use. 1 / 2

BCM DTC Status Display will advise if any BCM DTC's are set. No DTC’s / DTC’s Set

F1: DIAGNOSTIC TROUBLE CODESThe following functions will be available in thismode:F0: Read Current DTC Information - a listing of all(if any) current DTC’s that have been set by theBCM will be displayed. A short description of whatthe DTC is, is also displayed in this mode.F1 Clear DTC Information - simply select F1:CLEAR CODES, press the ENTER button onTECH 2 and confirm the action as instructed byTECH 2.The following chart sets out all the possible BCMDTC’s as indicated by TECH 2 for Low SeriesBCM’s.Refer to the relevant diagnostic chart in this Sectionwhen attempting rectification of a system problemor failure.

Figure 12J-1-90

BCM DIAGNOSTIC TROUBLE CODES

DTC CODE DESCRIPTION REFER1 Output overload - sets if the BCM’s output

protection circuitry detects an output driveroverload. This will cause all BCM output drives tobe set to the inactive state. The BCM will thenattempt to drive all outputs approximately every10ms, thus causing all active BCM output drivesto repeatedly switch from an active to an inactivestate until the fault condition is remedied.NOTE:The BCM is unable to identify which output isbeing overloaded.

This DTC can be set by any one of the BCM outputs beingshorted to battery positive, therefore, if DTC 1 is set, refer tosection relevant to driver complaint (if any).For a listing of all BCM outputs, refer to the MID SERIESBCM TERMINAL IDENTIFICATION chart in 1 GENERALDESCRIPTION in this Section.NOTE:DTC 1 can also be set by electrical transients, therefore, ifDTC 1 is set and there are no noticeable problems with thevehicle, clear DTC and check function of BCM outputs. IfDTC does not reset and BCM outputs are functioningcorrectly, disregard DTC 1

2 Slip Ring Failure - sets if the number of failed slipring reads exceeds a programmable percentageof all slip ring reads (approximately 18 failed slipring reads out of 100 good slip ring reads).

4.5 THEFT DETERRENT, in this Section to rectify problem.

7 PCM Data Lost - sets when the BCM does notreceive responses from the PCM or receivesincorrectly formatted responses from the PCMwithin three seconds of normal serial data busactivity.The three second time out period is resetwhenever the following conditions occur:• Ignition switched from OFF to ON.• A good PCM poll response is received from

the PCM.• A key has been programmed.• BCM has just been reset.

4.2 SERIAL DATA COMMUNICATION, in this Section torectify problem.

8 PCM Vehicle Speed Data Unstable - sets if theBCM receives two consecutive road speedupdates from the PCM with a magnitudedifference of 30 km/h.(This DTC can also be set by wheel spin)

Connect TECH 2 to DLC, select Engine / Data Display, scrollto Vehicle Speed, road test vehicle and note if screendisplays actual vehicle speed. If it does not display actualvehicle speed, refer to Section 6C1 POWERTRAINMANAGEMENT - V6 ENGINE or Section 6C2POWERTRAIN MANAGEMENT - V8 ENGINE. If screendoes display actual vehicle speed, replace BCM.

17 Serial Data Bus Fault - sets if the BCM cannotdetect six consecutive messages on the serialdata bus. This trouble code indicates either ashort circuit on the bus or if two or more modulessend a message at the same time.

4.2 SERIAL DATA COMMUNICATION, in this Section torectify problem.

F2: DATA DISPLAYIn this test mode, TECH 2 checks if the BCM is actually receiving an input or inputs from the appropriate sensor/s oractuator/s for the system being diagnosed.If the sensor/s or actuator/s input/s are not being received, then carry out the relevant system diagnosis as definedin this Section.If the sensor/s or actuator/s input/s are being received, go to the appropriate F4: BCM TEST mode to command theBCM via TECH 2 to operate the system output.Should the system output or actuator not function correctly, conduct relevant system diagnosis as defined in thisSection. If system wiring and output actuator are OK, replace BCM.A description explaining the display and, where applicable, affected terminals is included in the charts below.NOTE:When the TECH 2 is communicating with the BCM, it also determines what type of BCM is fitted to the vehicle andtherefore only the relevant data list and functional tests will be displayed.

DATA LIST

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDBCM LEVEL Displays what level of BCM is fitted to the vehicle.

The screen should display LOW or MID depending onwhether vehicle is fitted with power windows.If fuse F31 or circuits 740 and/or 1040 are open circuited,communication with the BCM will not be possible. If thesecircuits are OK, refer to 4.2 SERIAL DATACOMMUNICATION in this Section.

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BCM TYPE Displays what type of BCM is fitted to the vehicle.The screen will display the type of BCM fitted to the vehicle(TYPE 1).If fuse F31 or circuits 740 and/or 1040 are open circuited,communication with the BCM will not be possible. If thesecircuits are OK, refer to 4.2 SERIAL DATACOMMUNICATION in this Section.

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VEHICLE SPEED Displays vehicle speed input to BCM via the main SDI(circuit 1221).If vehicle speed cannot be displayed in the BCM DataDisplay mode, road test vehicle and check if it can bedisplayed in the Engine Data Display mode. If it can not bedisplayed, refer to Section 6C1 POWERTRAINMANAGEMENT - V6 ENGINE or Section 6C2POWERTRAIN MANAGEMENT - V8 ENGINE. If vehiclespeed can be displayed in the Engine Data Display mode,replace BCM.

D2

SLIP RINGENABLED

Screen display may flash from NO to YES briefly when BCMreceives a correct key reading. If BCM does not receive acorrect key reading, screen will flash between NO YEScontinuously until a correct reading is achieved.If screen does not change as described, refer to 4.5 THEFTDETERRENT in this Section.

D12

IGNITION SWITCH Displays current state of ignition switch as sensed by theBCM.Will display ON with ignition switch in IGN or STARTpositions and OFF in ACC or OFF positions.If screen display doesn’t change as described, checkcircuitry between ignition switch and BCM, and ignitionswitch contacts. If circuit and switch are OK, BCM is faulty.

D6

Barney Gumble

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDCENTRALLOCKING

Displays the current state of the BCM’s internal central doorlocking relays.When locking the central door locking system, eitherremotely or by turning the RH door key switch, the screendisplay changes to ALL LOCK. If the RH door key switch isactivated a second time, the screen will displayDEADLOCKED.When unlocking the system by turning the RHF door keyswitch, the screen display changes from ALL LOCKED orDEADLOCKED to ALL UNLOCK.Unlocking remotely, the screen display changes from ALLLOCKED or DEADLOCKED to DRIVER UNLOCK on firstpress (If vehicle is programmed with two stage unlocking)and second button press, the screen displays ALLUNLOCK.If screen display does not change as described, refer to 4.3CENTRAL DOOR LOCKING and carry out FUNCTIONALCHECK - CENTRAL DOOR LOCKING.

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DRIVER’S DOORUNLOCK SWITCH

Displays RHF door lock actuator / key switch input to BCM.With doors locked, screen displays OFF, unlocking thedriver’s door or all doors, screen will change to ON.If the circuit from BCM terminal C20 is open circuited, thepassenger’s doors cannot be unlocked by the RHF doorlock key switch.

C20

PASSENGER’SDOOR UNLOCKSWITCH

Displays passenger door lock actuator switch inputs to theBCM.With doors locked, screen displays OFF, unlocking thepassenger doors, screen changes to ON.If the circuit from BCM terminal C9 is open circuited, thepassenger doors cannot be unlocked. The screen displaywill also remain unchanged.

C9

LOCK SWITCHSTATUS

Displays the front doors lock actuator inputs to the BCM.When doors are locked, by activating either of the front doorlock actuators (snib), screen displays ON. When doors areunlocked, screen displays OFF.If circuit is open, doors can not be locked from the front doorlock actuators (snib), but system can be locked remotely.If screen display does not change as described, refer to 4.3CENTRAL DOOR LOCKING in this Section and carry outFUNCTIONAL CHECK - CENTRAL DOOR LOCKING.

C21

DEADLOCKSWITCH

Displays RHF door lock microswitch input to BCM.With RHF door lock cylinder in the unlocked and lockedposition, screen displays OFF. Display will change toDEADLOCK when the door lock cylinder is turned to thedeadlock position.If circuit 197 is open circuited, doors cannot be locked ordeadlocked by turning the RHF door lock cylinder andscreen display will remain off. However, doors can belocked and deadlocked remotely.If screen display does not change as described, refer to 4.3CENTRAL DOOR LOCKING in this Section and carry outFUNCTIONAL CHECK - CENTRAL DOOR LOCKING.

C22

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDDOME LAMP DRIVE Display changes from OFF to ON as dome lamp is turned

ON or when the remote coded key UNLOCK button isdepressed. Display goes OFF when the ignition is turnedON. This check confirms if the BCM internal circuitry isoperating(a relay within the BCM will be heard to click as thedrive is turned on).If circuit 174 between the BCM, terminal C25 and theinterior lighting is open circuited, the interior lighting will notcome on.If screen display does not change as described, refer to4.12 DOME LAMP DELAY CONTROL in this Section.

C24

HEADLAMPSWITCH

Displays status of switch during auto off period only.Display changes from OFF to ON as headlamps delayperiod is in progress. This check confirms that the BCMinternal switching is operating. Display goes to OFF whenthe headlamp auto off is cancelled.If screen does not change as described, refer to 4.10AUTOMATIC LIGHTS OFF CONTROL in this Section.

D14

HEADLAMP DRIVE With the ignition turned on, screen displays ON, turning theignition off, the screen will still display ON. Turn headlampson, scroll ignition from on to off and open the driver’s door,screen will change from ON to OFF and headlamps will goout.If screen does not change as described, refer to 4.10AUTOMATIC LIGHTS CONTROL OFF in this Section.

D14

DRIVER’S DOOR Displays the driver’s door jamb switch input to the BCM.When the driver’s door is open, the screen display shouldbe OPEN, and when the door is closed, the screen shoulddisplay CLOSED.If screen does not change as described, refer to 4.5 THEFTDETERRENT in this Section.

C8

PASSENGERDOORS

Displays the passenger’s door jamb switch input to theBCM.When the passenger’s door is open, the screen displayshould be OPEN, and when the door is closed, the screenshould display CLOSED.If screen does not change as described, refer to 4.5 THEFTDETERRENT in this Section.

C7

FRONT WASHERPUMP SWITCH

Displays front washer pump switch input to BCM.With ignition on and the washer pump switch activated,screen display changes from OFF to ON.If circuit 94, between the BCM and the wiper/washer switchis open circuited, the wipe after wash function will notoperate.If screen display does not change, check circuit 94 betweenBCM terminal D18 and wiper/washer switch (includingwiper/washer switch contacts), refer to Section 12CINSTRUMENTS, WIPER/WASHER AND HORN.

D18

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDWIPER PARKSWITCH

Displays input to BCM.With wipers in the park position, screen displays ON. Withwipers operating, display will change to OFF andmomentarily go to ON as wipers operate through the parkregion.If circuit 196, between the BCM and the wiper motor is opencircuited, the screen will display ON all the time and wiperswill not park when turned off.If screen display remains ON with wipers operating, checkfor open circuit between BCM terminal B9 and wiper motor,carry out checks of wiper motor, refer to Section 12CINSTRUMENTS, WIPER/WASHER AND HORN.

B9

FRONT WIPERINTERMITTENTSWITCH

Displays wiper/washer switch intermittent switch contactsinput to BCM.With ignition on and wiper/washer switch set to theintermittent position, screen display changes to ON.If circuit 97, between the BCM and the wiper/washer switchis open circuited, there will be no intermittent wiper function.If screen display does not change, check circuit 97 betweenBCM terminal D10 and wiper/washer switch (includingwiper/washer switch contacts), refer to Section 12CINSTRUMENTS, WIPER/WASHER AND HORN.

D10

INTERMITTENTWIPER DRIVE

With wipers operating in the intermittent mode, screendisplays ON. With wipers in the parked position, and in 1st or2nd speed, screen displays off.If screen displays are not as described, refer to 4.11 WIPERCONTROL SYSTEM in this Section.

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FRONT WIPERDWELL TIME

Displays wiper/washer switch dwell time input to the BCM.The wiper dwell on vehicles with a low series BCM is a fixeddwell period of approximately 8.0 seconds and is non-adjustable.If wipers do not operate intermittently when selected, checkfor open in circuit 97 between BCM terminal D10 andwiper/washer switch (including wiper/washer dwell controladjustment contacts, refer to Section 12C INSTRUMENTS,WIPER/WASHER AND HORN.

D10

REAR WASH PUMPSWITCH

Displays rear washer pump switch input to BCM.With ignition on and the washer pump switch activated,screen display changes from OFF to ON.If circuit 494, between the BCM and the wiper/washer switchis open circuited, the wipe after wash function will notoperate.If screen display does not change, check circuit 494between BCM terminal D19 and wiper/washer switch(including wiper/washer switch contacts), refer to Section12C INSTRUMENTS, WIPER/WASHER AND HORN.

D19

REAR WIPERSWITCH

Displays rear wiper switch input to BCM.With ignition on and the rear wiper switch in the on position,screen will change from OFF to ON (this applies to wagononly, on sedan models, the screen will always display OFF).If screen displays are not as described, refer to 4.11 WIPERCONTROL SYSTEM in this Section.

D7

HEATED REARWINDOW DRIVE

With ignition on, screen display changes from OFF to ON asthe heated rear window is turned on, and then to off asswitch is turned off. Also, if turned on, it will remain on forfifteen minutes, provided the switch is not reactivated andthe screen will then display OFF. This check confirms thatthe BCM internal circuitry is operating.

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Barney Gumble

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDHEATED REARWINDOW SWITCH

Displays heated rear window switch input to BCM.Display will change from OFF to ON as switch is depressedand held on. Release switch and display will change to OFF.If screen does not change, check wiring between BCMterminal D20 and heated rear window switch and heatedrear window switch contacts, refer to 4.7 HEATED REARWINDOW in this Section.

D20

POWER WINDOWSWITCH

Displays input to BCM.With power windows enabled, screen displays OFF. Withdriver’s window switch down button activated, screendisplays DOWN. With driver’s window switch up buttonactivated, screen displays UP.If screen does not display DOWN when the down button isactivated and the window automatic down function does notwork, check for open circuit between BCM terminal C14 andthe driver’s side power window switch.

C14 (Down)C16 (Up)

WINDOW AUTODOWN DRIVE

Screen display changes from OFF to ON when the driver’sside power window switch automatic down button isactivated and functioning. Will also display ON when downbutton is activated, but with automatic down feature notfunctioning.If the driver’s side power window operates normally exceptfor the automatic down feature, and all system inputs aredetermined to be OK, then BCM is faulty.

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POWER WINDOWRELAY

Displays the power window relay status as determined bythe BCM internal circuitry. The relay is enabled by the BCMearthing circuit 173.With the power window switch enabled (lights in powerswitch illuminated), screen displays ENABLED. With thesystem OFF, screen displays DISABLED.If the screen displays ENABLED but the lights in the powerwindow switch do not illuminate, check for open in wiring toBCM terminal A3.If screen displays are not as described, refer to 4.8 POWERWINDOW SYSTEM in this Section.

A3

CRUISE CONTROLINPUT SIGNAL

Displays the cruise control on/off switch input status to theBCM.With ignition on, each activation of the cruise on/off switchwill toggle the screen display to the next state, ie. OFF toON or ON to OFF.If the screen display changes as described, but the cruisecontrol CRUISE lamp in the instrument cluster does notilluminate, refer to 4.14 CRUISE CONTROL in this Section.If screen display does not change, refer to Section 12ECRUISE CONTROL.

D8

A/C SWITCH Displays air conditioning switch input to BCM.Display will change from OFF to ON as switch is depressedand held on. Release switch and display will change to OFF.If screen does not change, check wiring between BCMterminal D9 and air conditioning switch and air conditioningswitch contacts, refer to 4.13 AIR CONDITIONINGINTERFACE in this Section.

D9

A/C INDICATOR Displays the status of the air conditioning system.With ignition on, and blower fan on, will display ON whenthe A/C switch is switched on, and OFF when switch isswitched off.If screen does not change, refer to 4.13 AIRCONDITIONING INTERFACE in this Section.

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SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDA/C BLOWERSWITCH

Displays air conditioning blower switch input to BCM.Display will change from OFF to ON when switch isswitched to from off to on.If screen does not change, refer to 4.13 AIRCONDITIONING INTERFACE in this Section.

B3

A/C BLOWERINHIBIT RELAY

With the ignition in the accessories or on positions, screenwill display ON. If screen does not change to ON, refer to4.13 AIR CONDITIONING INTERFACE in this Section.

B1

BOOT RELAESESWITCH

Displays boot release switch input to BCM.With the boot release switch (located in glove compartment)in the rest position, screen displays OFF. With switch heldin, switch displays ON.If screen does not change as described, refer to 4.4 BOOTRELEASE in this Section.

D16

BOOT SOLENOIDDRIVE

Provided the vehicle speed is less than 15 km/h, depressingthe boot release button on the remote coded key will causethe screen display to change from CLOSED to OPEN as theBCM internal relay is activated.If screen does not change or boot release does not operate,refer to 4.4 BOOT RELEASE in this Section.

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OVERRIDE STATUS This screen displays that status of the theft deterrentsystems override function. TECH 2 will display SECURITYOFF when the theft deterrent system has been overridden,ie. When the BCM has not received any serial data from theremote coded key and the ignition switch has been turnedON for approximately two hours.If the status does not change, refer to 4.5 THEFTDETERRENT diagnosis in this Section

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SECURITY LED Displays current state of the BCM’s theft deterrent systemLED driver condition. If the LED is flashing, ie. systemarmed, the screen will pulse between ON and OFF.NOTE:TECH 2 and security LED are synchronised.This checks that the BCM is turning on and off the voltagesupply.If TECH 2 screen display does not change, the BCM isfaulty.If TECH 2 screen display does change, but the LED doesnot flash, check for open in wiring from BCM to LED

A8

INDICATORS When the BCM activates the indicators via its internal relay,the screen display alternates between ON and OFF as theindicators flash.This checks that the BCM is pulsing its internal relay,thereby supplying voltage from BCM terminal B5 toterminals B4 and B12. If screen display does not change asdescribed, BCM is faulty.If screen display does change as described, but theindicators do not flash, check for open circuit in wiring fromBCM output terminals B4 and B12 or input to BCM terminalB5 (refer to 4.5 THEFT DETERRENT diagnosis in thisSection).

B4, B5, B12

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDPASSIVE MODE With the theft deterrent system in passive arm state, screen

displays should be ON (theft deterrent LED flashing).-

REMOTE DOORSIGNAL

Screen display changes to UNLOCK then OFF whenremote coded key unlock button is depressed. Changes toLOCK to OFF when lock button is depressed.If the screen displays INVALID KEY continuously when theremote coded key is depressed, and the BCM does notoperate, that particular remote coded key is not coded to theBCM (refer to 4.6 REMOTE RECEIVER/KEY in thisSection).NOTE:Due to the fact that the screen changes when the remotecoded key is depressed, is confirmation that there is an RFoutput from the remote coded key and that it is recognisedby the BCM either as correct or invalid.

-

REMOTE BOOTSIGNAL

Screen display changes to OPEN then OFF when the bootrelease button on the remote coded key is depressed.If the screen displays INVALID KEY continuously when theboot release button on the remote coded key is depressed,and the BCM does not operate, that particular remote codedkey is not coded to the BCM (refer to 4.6 REMOTERECEIVER/KEY in this Section).NOTE:Due to the fact that the screen changes when the remotecoded key is depressed, is confirmation that there is an RFoutput from the remote coded key and that it is recognisedby the BCM either as correct or invalid.

-

REMOTE KEYNUMBER

Depressing a button on the remote coded key enables theBCM to read the key’s security code information. If theremote coded key has been programmed to the BCM, thescreen displays the remote coded key user number that hasbeen assigned to it during the programming process.A BCM can have up to 31 different remote coded keysprogrammed into it.

-

SERIAL DATA BUSISOLATION

Displays serial data bus isolation internal switch status.During normal operations (ignition on, cranking or enginerunning) the serial data bus isolation switch will be closedand screen displays NORMAL. If engine will not start within0.5 seconds of being cranked, the serial data bus isolationswitch will open (isolating auxiliary serial data bus) for amaximum period of 5 seconds, during this time, screendisplay will change to DATA CUTOFFIf screen displays are not as described, refer to 4.2 SERIALDATA COMMUNICATION in this Section.

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LOW FAN DRIVE This checks the BCM’s ability to turn on it’s internal driver toearth, thus enabling the engine cooling low speed fan.With the low speed fan not operating, screen displays OFF.With fan operating, screen displays ON.

DTC STATUS Display will advise if any BCM DTC's are set.Screen will display No DTC’s if there are no DTC’s or DTC’sSet if there are any BCM DTC’s set.

-

PART NUMBERSCREEN DISPLAY DESCRIPTION TERMINAL AFFECTEDPART NUMBER With the theft deterrent system disarmed, TECH 2 displays

the last two digits of the Holden part number for the BCMfitted to the vehicle (ie. 86).This information can be checked against the part numberlabel attached to the BCM case, refer Fig. 12J-1-1 in thisSection.

F3: SNAPSHOTIn this mode, TECH 2 captures data before and after a forced manual trigger.The purpose of the SNAPSHOT test mode is to help isolate an intermittent or transient problem by storing BCMdata parameters just before and just after a problem occurs.

F4: MISCELLANEOUS TESTSIn this test mode, Tech 2 performs various functional tests to assist in problem isolation during trouble shooting.If a vehicle component is commanded by TECH 2 to operate and the TECH 2 screen display changes as per thiscommand, yet the component does not operate, check for a faulty circuit between the BCM and the component (ie.If low speed cooling fan is commanded ON, TECH 2 screen displays LOW SPEED COOLING FAN ON yet the lowspeed cooling fan is physically not ON, then check cooling fan wiring between the BCM and the low speed coolingfan, including cooling fan, for open or short circuit).To operate any of the miscellaneous tests, simply select the appropriate functional test from the miscellaneous testapplication menu and follow the instructions as per TECH 2.When the Miscellaneous Tests option is selected, the following options will become available.NOTE:additional application menu screens will be displayed for Lamps, Wiper Tests, and Security Systems.• Lamps: If lamps are selected, an additional application menu will be displayed offering additional functional tests

of the vehicles lighting system.• Dome: In this mode, TECH 2 commands the BCM to switch on and off the interior lighting.

If the interior lighting does not operate, refer to 4.12 DOME LAMP DELAY CONTROL diagnosis in thisSection.

• Lamp Delay Drive: In this mode with the ignition OFF and the headlamps and park lamps turned ON, TECH2 commands the BCM to switch OFF and ON the vehicle park lamps and headlamps.If lamps do not switch off when commanded, refer to 4.10 AUTOMATIC LIGHTS OFF CONTROL diagnosisin this Section.

• Indicators: In this mode, TECH 2 commands the BCM to switch ON and OFF the turn signal indicator lamps,including the warning lamps in the instrument cluster.If the turn signal lamps do not operate when commanded by TECH 2, refer to 4.5 THEFT DETERRENTdiagnosis in this Section.

• A/C Test: In this mode, TECH 2 commands the BCM to switch the A/C on/off switch LED on and off.If LED status does not change when commanded, refer to 4.13 AIR CONDITIONING INTERFACE in thisSection.

• Low Fan: In this mode, TECH 2 commands the BCM to switch ON and then OFF, (will switch OFF automaticallyafter a short period provided the PCM is not commanding the low fan on) the engine cooling low speed fan relay.If the engine cooling low speed fan does not operate in this mode, refer to 4.9 ENGINE COOLING LOWSPEED FAN CONTROL diagnosis in this Section.

• Data Bus Isolator: In this mode, the BCM data bus isolator switch can be opened or closed.To check if the data bus isolator is operating, start engine, command the data bus isolator switch open withTECH 2 and hold the right arrow key down for 10 seconds. When the data bus isolator switch is opened for morethan 10 seconds with the engine running, the engine check light in the instrument cluster will illuminate (noDTC’s will be set).If the data bus isolator will not change state, refer to 4.2 SERIAL DATA COMMUNICATION diagnosis, in thisSection.NOTE:The Data Bus Isolator will only be held open for 5 seconds unless the right arrow key is held down.

• Central Locking: In this mode, TECH 2 commands the BCM to operate all door lock actuators.If door locks do not operate, refer to 4.3 CENTRAL DOOR LOCKING diagnosis in this Section.

• Heated Rear Window : In this mode, the rear window demister can be turned on and off.When switched on, the heated rear window switch LED is illuminated and the relay can be heard to operate.If the LED does not illuminate or the relay does not click when operated, refer to 4.7 HEATED REAR WINDOWin this Section.

• Wiper Tests: If Wipers are selected, an additional application menu will be displayed offering extra functionaltests of the vehicles wiper system.• Front Wipers: In this mode, the front windshield wipers can be driven ON and OFF.• Rear Wipers: In this mode, the rear screen wipers can be driven ON and OFF.If the wipers to not operate when commanded by TECH 2, refer to 4.11 WIPER CONTROL SYSTEM in thisSection.

• Window Down: In this mode, the driver’s window can be driven down.

NOTE:Before entering and conducting this test, ensure that driver's side power window is fully up.If the power window auto down function does not operate when commanded by TECH 2, refer to 4.8 POWERWINDOW SYSTEMS diagnosis in this Section.

• Power Window Relay: In this mode, TECH 2 commands the BCM to turn off the power window relay.If the power relay is disabled, the power window will not function. If power windows still function while disabled,refer to 4.8 POWER WINDOW SYSTEM diagnosis in this Section.

• Security System: If the security system mode is selected, an additional application menu will be displayedoffering additional functional tests of the vehicles security system.• Security LED: In this mode, TECH 2 commands the BCM to turn the theft deterrent alert indicator LED ON

and OFF.If the theft deterrent LED does not operate in this mode, refer to 4.5 THEFT DETERRENT diagnosis in thisSection.

• Boot Release: In this mode, TECH 2 commands the BCM to activate the sedan rear compartment lockactuator.If the boot release does not work in this mode, refer to 4.4 BOOT RELEASE diagnosis in this Section.

• Alarm Output: In this mode, the alarm status output can be switched on or off (this feature is for an aftermarket alarm system).

F5: PROGRAMIn this test mode, TECH 2 allows the programming of various features by turning the feature OFF or ON, oradjusting settings to suit individual owner requests.To operate any of the programming features, simply select the appropriate function to be changed from theProgram Application Menu and follow the instructions as per TECH 2.When the Program option is selected, the following choices will become available.• Rear Wiper Control: In this mode, the rear wiper control can be disabled. By disabling this feature, it will change

the rear wiper continuously sweeping the tailgate screen when the rear intermittent wiper is activated andreverse gear is selected to, continuously sweeping the tailgate screen when the front wiper is activated andreverse gear is selected.

• Two Stage Unlocking: In this mode, the two stage door unlock feature (one press of remote coded key unlockbutton will unlock the driver’s door only, a second press will open all doors)” can be disabled, thus enablingsingle stage unlock (one press of remote coded key unlock button will unlock all doors).

F6: SECURITYIn this test mode, Tech 2 provides the user with the capability of: linking the PCM to the BCM, reading securityinformation (ie. radio pin numbers), and programming security features (ie. keys).NOTE:A precondition to all security features is: the theft deterrent system must be disarmed and the ignition must beswitched ON with a programmed remote coded key.When the Security option is selected, the following choices will become available.• BCM Link to PCM: If the BCM is replaced, the new BCM must be linked to the PCM otherwise, the vehicle will

not crank. Likewise, if the PCM is replaced, the new PCM must be security linked to the BCM.By selecting this mode, after the new BCM or PCM has been installed, TECH 2 will security link thesecomponents. Once BCM link to PCM is selected, simply follow the instructions of TECH 2.

• Security Information: If this mode is selected, the following vehicle security information is displayed.• Radio PIN• Mechanical Key Number• Glove Box Key

• ProgramNOTE:Programming features are only available to Authorised Holden Dealers. Consult separate literature for furtherdetails.

4. DIAGNOSIS

4.1 PREREQUISITES TO DIAGNOSIS AND TROUBLESHOOTING

PRELIMINARY SYSTEM REQUIREMENTSThe prerequisites before proceeding with system checks are:• Ensure no moisture is present in the wiring harness connections in either A-pillar.• Ensure that sound earth connections are available for all functioning components, particularly at the body earth

connection (fender panel inner stud, adjacent to the battery).• Ensure the battery is in good condition and adequately charged (above 11.5 volts) before carrying out any

electrical checks.

SAFETY REQUIREMENTSDisconnect the battery when carrying out work which involves the risk of an electrical short circuit.Do not touch mechanical components during function checks, to avoid the risk of a hand being caught in themechanism.

CHECKING EQUIPMENTTECH 2 diagnostic tool.A digital multimeter, with a minimum 20 Megohm impedance MUST be used when undertaking any electricalchecks on these systems.Exercise care when taking readings from wiring harness connectors. It is preferred that the back probing methodwith individual connectors is employed wherever possible, to avoid terminal damage and subsequent connectionfailure.When carrying out wiring checks as directed to by the diagnostic charts, rather than probe terminals and connectorswith incorrect sized multimeter connections, use the adaptors contained in connector test adaptor kit KM-609. Thiswill prevent any possibility of spreading or damaging wiring harness terminals.IMPORTANT:• ENSURE THAT THE IGNITION IS TURNED OFF AND THE BATTERY EARTH LEAD IS DISCONNECTED

BEFORE ANY TEST THAT REQUIRES DISCONNECTION OR RECONNECTION OF ANY OF THE BCMCONNECTORS.

• When checking the complete system, the exact order of the test steps should be observed.• If the required nominal value is not achieved in any stage, then the problem must be rectified before proceeding

further.• Unless the multimeter being used has an auto ranging function, check that the correct range, as specified, is

selected before the test is carried out.• It will be necessary to lower the BCM down to gain access to BCM wiring harness connectors, refer to

2.2 LOW SERIES BCM in this Section.• Testing of the various systems will involve gaining access to specific wiring harness connectors. For the location

of these connectors, refer to Section 12N FUSES AND WIRING HARNESSES.

KEY READER CIRCUIT DIAGNOSIS

INTERMITTENT OPERATION Preliminary Checks • Check for loose key shaft. • Check for correct screws. • Correct length of remote key shaft. (Check shaft against a known good key). • Remove the key shaft, clean the earth contact, key shaft and reinstall the key shaft. If screws won’t retain or if

the screw threads are deformed, then replace the screws.

STEP ACTION YES NO 1. • Is the case cracked along the weld line, or are there

visible gaps (at the sides only)? Refer to Figure12J-1-89A.

Replace Key. Go to step 2.

2. • Are any of the buttons collapsed , depressed or damaged? Replace Key. Go to step 3.

3. • With the Theft Deterrent LED flashing, insert the remote key into the ignition switch and slowly turn to the ‘ON’ position.

• Does the Theft Deterrent LED stop flashing?

Go to step 4. Go to step 6.

4. • With the Theft Deterrent LED off, turn the remote key to the ‘START’ position.

• Does the vehicle start? Go to step 5

Refer to 4.5 Theft Deterrent

diagnosis in this Section.

5 • Does the customer complain that occasionally the Traction Control Light remains ‘ON’ or Theft Deterrent LED continues to flash at a quicker rate after starting?


6. • Connect a multimeter between a known good earth and one of the reader slip rings.

• Apply a thick tape over the remote key contact pin and insert into the ignition switch.

• Is there on the slip ring 4 - 6V AC constantly when the remote key is turned to the ‘ON’ position?

• At end of test, remove tape from the remote key.


7. • Check integrity of ignition barrel earth by-: Visually inspecting earth strap on ignition lock housing. Checking tightness of earth strap. Checking for continuity to known good earth. • Is ignition barrel earth OK?

Vehicle built prior to 15/8/01,

Go to Step 10.

Vehicle built after 15/8/01 Go to Step 11.

Repair or replace faulty components.

Recheck circuit to verify repair.

8. • With a multimeter check for continuity between BCM and remote key reader.

• Is there continuity? Go to step 9.

Repair open circuit.

Recheck circuit to verify repair.

9. • Disconnect appropriate BCM connector (Refer to Wiring Diagrams)

• With the ignition switch in the ‘OFF’ position check for a short to B+/Earth on the slip ring.

• Is there a short?

Repair short circuit.

Recheck circuit to verify

repair.

Call Australian Arrow on

03 9785 0792

10. • Align Key reader - Remove key reader and align the locating rib on the

Reader with the ignition barrel. • Does the vehicle start?

Verify repair. Return vehicle

to customer and monitor.

Go to step 11.

STEP ACTION YES NO 11. • Check for a slip ring contact as per following procedure -:

- Remove starter relay from the engine bay to prevent the vehicle from cranking.

- Disconnect Remote key reader connector by access from under steering column cover.

- Ensure the Theft Deterrent LED is flashing, and slowly turn key and hold in crank position.

- While holding in crank position, reconnect the reader connector.

- Does the Theft Deterrent LED switch off (has key been read)?

- Remove ignition key, rotate it 180 degrees, insert into the ignition switch and check contact with the second slip ring with the same method.

• Did the or Theft Deterrent LED stop flashing in both first and second slip ring tests?


03 9785 0792 Go to step 12.

12. • Check for worn or relaxed key reader contacts as per following procedure -: - With or Theft Deterrent LED flashing, turn key to

Accessories position. - Apply outward pre-load to key, by pulling on key

gently away from reader. - While monitoring or Theft Deterrent LED, quickly turn

key from Accessory to crank position. - Visually inspect for the key contact pin making

contact with the slip ring., - Remove ignition key, rotate it 180 degrees, insert into

the ignition switch and check contact with the second slip ring with the same method.

• Did the Theft Deterrent LED stop flashing?

Vehicle built prior to May 98, Replace Remote Key.

Vehicle built post May 98,


03 9785 0792

Replace with full circle slip

ring assembly.

REMOTE OPERATION

Diagnostic Aids: Prior to further diagnosis, technicians should be aware of the following system functions:

• There is a 2 second delay on the remote boot release • The central locking system will time-out as a result of multiple activation of the lock or unlock remote

buttons. • Loss of rolling code synchronisation can be rectified by cycling the key in ignition. • Metal objects such as other keys on the key ring or key tags can effect range if folded over the remote key

head. • If the reported problem is specific to one area, radio or TV towers can effect key range and performance. • Damaged key casing may cause moisture ingress resulting in premature key failure.

STEP ACTION YES NO

1. • Is the case cracked along the weld line, or are there visible gaps (at the sides only)? Refer to Figure 12J-1-89A.

Replace Key. Go to step 2.

2. • Are any of the buttons collapsed , depressed or damaged? Replace Key. Go to step 3.

STEP ACTION YES NO 3. • With all doors closed and unlocked, insert the remote into

the driver’s door lock barrel and turn anti-clockwise. • Do all doors lock?


4. • Does the Dome lamp remain on with the ignition in the ‘ON’ position and all the doors closed?

Inspect door jamb switches or circuit for

short to earth.

Refer to 4.3 Central Door

Locking diagnosis in this

Section. 5 • With all doors closed and unlocked, operate the

DOOR/LOCK button on the remote key within 4 metres of the driver’s side ‘B’ pillar.

• Do all doors lock?


6. • Vehicles with remote boot operation, - Operate the BOOT button on the remote key for at

least 2 seconds within 2 metres of the rear of the vehicle.

• Does the boot solenoid activate?

Refer diagnostic aids above then Go to step 10.

Go to step 8

7. • Does the remote key operate intermittently while tapping it? Replace Key. Go to step 8.

8. • Connect TECH 2 to the DLC. • Proceed to the BCM Data List mode and select REMOTE

DOOR and REMOTE BOOT signals. • Operate the UNLOCK/LOCK/BOOT button on the remote

key. • Does the Screen Display change to show either

‘UNLOCK’ or ‘LOCK’ or ‘OPEN’?

For Door unlocking

problems, call Australian Arrow on

03 9785 0792. For boot release problems refer

to 4.4 Boot Release

diagnosis in this Section.

Go to Step 9.

9. • Connect TECH 2 to the DLC of another fully functional VT/WH vehicle.

• Proceed to the BCM Data List mode and select REMOTE DOOR and REMOTE BOOT signals.

• Operate the UNLOCK/LOCK/BOOT button on the remote key.

• Does the Screen Display change to show ‘INVALID KEY’?

Go to Step 10. Replace Remote Key.

10. • Test receiver/sunsensor - Confirm normal 4 metre remote range is achievable

with passenger compartment cool. - Use a 150 Watt lamp applied to the remote receiver

for 5 minutes maximum. Recheck remote range – is it less than 4 metres from the drivers side door when hot but more than 4 metres range when cold?

Replace receiver or sunsensor

Call Australian Arrow Customer

Service on 03 9785 0792

Figure 12J-1-89A

4.2 SERIAL DATA COMMUNICATION

Figure 12J-1-90

GENERAL INFORMATIONThe VT Series Model uses a Bus Master communication system where the BCM is the Bus Master.The BCM periodically polls (surveys) each device on the bus and requests status data.The devices connected to the bus are:

• Body Control Module (BCM).• Powertrain Control Module (PCM).• Instrument cluster (INS).• Antilock Brake System / Electronic Traction Control (ABS/ETC).• Supplemental Restraint System (SRS).• External diagnostic scan tool (TECH 2).

The data provided by each device may be utilised by any device connected to the bus.Each device has a unique response “MessageIdentifier Word” (MIW) for ease of identification.The bus master (BCM) polls each device with a serial data message which includes that devices MIW. The deviceresponds by putting a serial data message back onto the bus. The devices message includes its MIW and data, ofwhich is retrieved and utilised by any device on the bus requiring it.

Excluding the PCM, the BCM polls each device for a status update once every 300 milliseconds. The BCM polls thePCM twice every 300 milliseconds.When the ignition is switched from OFF to ON, the BCM will communicate with the PCM, via the main serial dataline (circuit 1221), for antitheft purposes and TECH 2 will be able to communicate with any module via the ALDLmode. If the BCM does not receive an OK TO START message from the PCM within 0.5 seconds of the ignitionbeing switched on, the auxiliary serial data line (circuit 1220) is isolated via switching within the BCM.The isolation of the auxiliary serial data line during this period eliminates any possibility of a device failure other thanthe PCM or BCM, causing a problem on the bus, inhibiting antitheft communications. This period (know as shortloop time) continues until the PCM responds with an acknowledgment or a maximum of five seconds after which theBCM will switch to the standard polling sequence.Following successful antitheft communications, the BCM begins sequential polling of devices on the bus and normalsystem operation is established.When the ignition is switched OFF, the BCM continues to poll, allowing for TECH 2 communications and externalcontrol of the bus prior to the ignition being switched ON.

TEST DESCRIPTIONThe numbers below refer to step numbers diagnostic chart.1. Ensures TECH 2 is functioning correctly.2. Checks if TECH 2 can communicate with the BCM.3. Checks if TECH 2 can communicate with the PCM.4. Checks if TECH 2 can communicate with all the devices (SRS, ABS/ETC, INS) on the auxiliary serial data line.5. Determines if there is a fault in the serial data circuit (1221) between the BCM and PCM by starting the engine.

If serial data was lost while the engine was running, the engine will restart but there will be a one second delay.6. Checks continuity of circuit 1221 between the BCM and the DLC.7. Checks if main serial data line crash is cause by control module interference connected to the auxiliary serial

data line, or a short battery + or earth on the auxiliary data line.8. Checks for correct voltage on the serial data line.9. Checks if the PCM is causing interface on the serial data line.10. Checks integrity of circuit 1221 between the BCM and PCM, and if there is a problem with the PCM.11. Checks to establish whether lost communication between modules on the auxiliary serial data line and TECH 2

is due to an open in circuit 1221 or the module itself.12. Checks to establish whether loss of communication on the auxiliary serial data line is due to an open in circuit

1221 or the BCM.

Figure 12J-1-91

SERIAL DATA COMMUNICATION

STEP ACTION VALUE YES NO1. • Connect TECH 2 to DLC.

• Turn ignition ON.• Push power button on TECH 2.• Does TECH 2 power up (screen

will illuminate display TECH 2)?

Go to Step 2. Go to TECH 2diagnosis, refer to

Section 0CTECH 2.

2. • With TECH 2 still connected andignition ON, select Diagnostics /Body / Body Control Module.

• Does TECH 2 display BCMsystem identification information(BCM level and type)?

Go to Step 3. Go to Step 5.

3. • With TECH 2 still connected,ignition ON, exit BODY and selectDiagnostics / Engine / EngineType (ie V6, V8).

• Does TECH 2 display PCMsystem identification information(ie. prom identification)?


4. • With TECH 2 still connected,ignition ON, exit EngineDiagnostics and select Body /DTC Check / DTC Check.

• Can TECH 2 communicate withall control modules fitted to thevehicle (if NO DATA is displayednext to a control module, thenthere is no communicationbetween TECH 2 and that controlmodule)?

NOTE:If vehicle is not equipped with aparticular feature, ie. ECC, No Datawill be displayed next to this modulein the TECH 2 display.

System OK. Go to Step 13.

5. • Will the engine crank and startimmediately the key is turnedfrom off to start (no delay)?


6. • Turn ignition OFF.• Back probe DLC connector

YB128, terminal 9, circuit 1221(Red/Black wire) and BCMconnector YB164, terminal D2,circuit 1221 (Red/Black wire) withan Ohmmeter.

• Is value as specified?

Below1 ohm

Go to Step 7. Check and repairopen in circuit1221 betweenDLC and BCM.Recheck andverify repair.

7. • Disconnect control modules onauxiliary serial data line (ABS,ABS/ETC, SRS, INS) one at atime checking each time if TECH2 can communicate with the BCM(refer to Step 2).

• Does communication between theBCM and TECH 2 resume afterdisconnecting any of the controlmodules?

Go to suspectcontrol module

diagnosis inthe relevant

Section.

Check and repairshort to B+ orearth in circuit

1220.Recheck andverify repair.

STEP ACTION VALUE YES NO8. • Turn ignition ON.

• Back probe DLC connectorYB128, terminal 9, circuit 1221(Red/Black wire) with a Voltmeterto earth.

• Is voltage as specified?

Fluctuatesbetween3 and 5

volts


9. • Disconnect PCM.• Can TECH 2 communicate with

the BCM (refer to Step 2)?

Go to PCMdiagnostics inSection 6C1

POWERTRAINMANAGEMENT

- V6 ENGINEor

Section 6C2POWERTRAINMANAGEMENT- V8 ENGINE.

Go to theftdeterrent

diagnosis, refer4.4 THEFT

DETERRENT inthis Section.

10. • Disconnect PCM.• Can TECH 2 communicate with

the BCM (refer to Step 2)?



- V6 ENGINEor


Go to Step 11.

11. • Disconnect BCM and TECH 2.• Check integrity (ie. Short to B+,

short to earth, and continuity) ofcircuit 1221 (Red/Black wire)between BCM and DLC, andPCM and DLC.

• Is circuit 1221 OK?

Go to theftdeterrent

diagnosis, referto 4.4 THEFT


Repair circuit 1221as necessary.Recheck andverify repair.

12. • Turn ignition OFF.• Back probe BCM connector

YB164, terminal D2, circuit 1221(Red/Black wire) and PCMconnector YB188, terminal A3,circuit 1221 (Red/Black wire) withan Ohmmeter.


Below1 ohm



- V6 ENGINEor


Check and repairopen in circuit1221 between

PCM and BCM.

13. • In Step 4, was TECH 2 able tocommunicate with at least one ofthe control modules on theauxiliary serial data line (ABS,ABS/ETC, INS, SRS)?

NOTE:TECH 2 will display No Data next toa control module that it can notcommunicate with in the DTC Checkmode.


STEP ACTION VALUE YES NO14. • Check continuity between BCM

and suspect control module incircuit 1220 (Green/White wire).

• Does continuity exist?

Go to suspectcontrol modulediagnosis in therelevant Section.

Repair open incircuit 1220

between suspectcontrol moduleand the BCM.Recheck andverify repair.

15. • Check continuity between BCMand all control modules on theauxiliary serial data line.

• Does continuity exist?

Replace BCM,refer to 2.2 LOWSERIES BCM in

this Section.Recheck andverify repair.

Repair open incircuit 1220.Recheck andverify repair.

4.3 CENTRAL DOOR LOCKING

Figure 12J-1-92

GENERAL INFORMATIONThe central door locking system provides for locking and unlocking of all doors and tailgate (station wagon models)as well as enhanced locking or 'deadlock' (doors only).The system incorporates the following functions:1. Door and tailgate locking activated via:

Driver's door lock actuator (mechanically linked to door interior snib and door latch).Left hand front passenger’s door lock actuator (mechanically linked to interior snib button).Driver’s door lock cylinder microswitches, which are also mechanically linked to the door latch, and thereforelinked to the actuators. VT Series Models require microswitch activation to force lock (and unlock) withoutmoving the actuator.Pressing the lock button on remote coded key (provided all doors are closed).

2. Door and tailgate unlocking via:All door lock actuators (mechanically linked to door interior snib).Pressing the unlock button on remote coded key.The driver’s door lock cylinder can also be moved independently of the actuator, allowing unlocking of thedriver’s door latch in the case where the actuator is struck down, ie. deadlock when the battery is discharged.

3. Single and Two Stage UnlockingThe BCM is capable of operating in either of two unlock modes, either two or single stage unlock. The BCM, asfitted to the vehicle is programmed to operate the central door locking system in the two stage unlock mode.

TWO STAGE UNLOCKIn the two stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds, the BCM,on receiving the unlock request from the remote coded key via the remote receiver, will unlock the driver’s dooronly. If the remote coded key unlock button is depressed again for 0.25 seconds the BCM, on receiving the secondunlock request from the remote coded key, will unlock all passenger doors.Or alternatively, if the remote coded key is depressed continuously for 0.5 seconds, the BCM, on receiving theunlock request from the remote coded key, will unlock all doors; first the driver’s door, then all passenger doors.

SINGLE STAGE UNLOCKIn single stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds or longer,the BCM on receiving the unlock request from the remote coded key, will unlock all doors simultaneously.With TECH 2, the BCM can be programmed to operate in either two stage or single stage unlock (depending on thevehicle’s owner or operator requirements).If a short circuit exists on either the lock or unlock signal inputs, the opposing input is still able to perform itsfunction. This enables the doors to be unlocked when a short circuit exists on the lock input or vice-versa.To protect the motors used in the door and tailgate lock actuators, in the event of multiple activations within adefined time period, the system will time-out and protect the motors from damage. After a fixed time delay, thesystem will re-activate as normal.The deadlock feature provides for mechanical jamming of the door lock actuators. This is achieved electrically viathe driver's door lock cylinder microswitch.NOTE:Deadlock is inhibited whilst the ignition is on.

SYSTEM CHECKThe operation of the Central Door Locking System is independent of the ignition being switched ON or OFF.Deadlock refers to the electrical means that can be activated to ensure vehicle security by inhibiting door lockoperation.Even though the electronic theft deterrent system, via the remote coded key, can activate the doors locks, it doesnot engage the electrical 'blocking' of the doors (deadlocking).

CENTRAL LOCKING AND UNLOCKINGOperation of this system can be effected as follows;1. Driver’s door, outside key and inside locking (snib) button (locking and unlocking).2. Left hand front passenger door inside locking (snib) button (locking and unlocking)3. Rear passenger doors inside locking (snib) button (only unlocking is possible).

DEADLOCKThe deadlocking feature applies to all four doors, but not to the luggage compartment lid or tailgate.After the deadlocking feature device has been engaged, unlocking is possible at the driver’s door from outside, byinserting the key into the driver’s door lock cylinder and turning the key to the unlock position or by activating the

unlock button on the remote key unlocks the deadlocks on all doors. Either method only unlocks the driver’s doorwhen two stage unlocking is enabled.To ensure access to the vehicle if the electrical system should fail (discharged battery), after the system has beenengaged, the driver’s door lock cylinder can be moved independently of the actuator and therefore allowingunlocking of the driver’s door latch.The rear compartment lid or tailgate can be locked/unlocked when the mechanical deadlocking feature is actuated,while leaving the doors secured.

NOTE:Deadlocking is not possible with the ignition in the ON position.

OVERHEATING PREVENTIONIn the event of multiple activations within a defined time period, the central door locking system will be deactivatedand remain inoperative for a defined time period to prevent the door actuators from overheating. After a fixed timedelay, the system will re-activate and operate as normal.

DIAGNOSTICS

NOTE:When investigating a complaint of a central door system locking problem or malfunction, always start the diagnosiswith the functional check in this Section.The functional check is a quick check of the central door locking system that will refer the reader to the appropriatediagnostic chart in this Section.When conducting the central door locking diagnostic tests, some procedures require locking and unlocking of thedoor lock mechanism. Therefore, as an aid in testing, leave the appropriate door open and use a screw driver torotate the door lock mechanism to the locked position.

Figure 12J-1-93

FUNCTIONAL CHECK - CENTRAL DOOR LOCKING

STEP ACTION VALUE YES NO1. • All doors locked.

• Operate unlock button onremote coded key within 4metres of driver’s side B pillar.

• Does driver’s door unlock (2stage unlocking) or all doors(single stage unlocking)?


2. • All doors locked.• Insert ignition key into driver’s

door lock cylinder and operatedoor unlock microswitch (turnkey to unlock position).

• Do all doors unlock?

Go to remotereceiver

diagnosis, referto 4.6 REMOTERECEIVER/KEYin this Section.

Go to Part AUNLOCKING

DOORS,DRIVER’S DOORLOCK CYLINDERMICROSWITCH

3. • All doors unlocked.• Ignition off.• All doors closed.• Operate lock button on remote

coded key within 4 metres ofdriver’s side B pillar.



4. • All doors unlocked.• All doors closed.• Insert ignition key into driver’s

door lock cylinder and operatedoor lock microswitch (turn keyto lock position).


Go to remotereceiver


Go to Part BLOCK DOORS,

DRIVER’S DOORLOCK CYLINDERMICROSWITCH

5. • All doors locked.• All doors closed.• Insert ignition key into driver’s



Go to Step 6. Go to Part AUNLOCKING

DOORS,DRIVER’S DOORLOCK CYLINDERMICROSWITCH

6. • All doors closed.• Insert ignition key into driver’s



Go to Step 7. Go to Part BLOCK DOORS,

DRIVER’S DOORLOCK CYLINDERMICROSWITCH

7. • All doors locked (notdeadlocked).

• Activate driver’s door snib(unlock).


Go to Step 8. Go to Part CUNLOCKDOORS,

DRIVER’S DOORACTUATOR

(SNIB).8. • All doors closed.

• All doors unlocked.• Activate driver’s door snib (lock).• Do all doors lock?

Go to Step 9. Go to Part DLOCK DOORS,

DRIVER’S DOORACTUATOR

(SNIB).

STEP ACTION VALUE YES NO9. • All doors locked (not

deadlocked).• Activate each passenger’s door

snib (unlock).• Do all doors unlock (each snib)?

Go to Step 10. Go to Part EUNLOCKDOORS,

PASSENGER’SDOOR

ACTUATOR(SNIB).

10. • All doors closed.• All doors unlocked.• Activate left hand front

passenger’s door snib (lock).• Do all doors lock?

Go toStep 11 (wagon)

orGo to

Step 13 (sedan).

Go to Part FLOCK DOORS,PASSENGER’S

LHF DOORACTUATOR

(SNIB).

11. • Tailgate locked.• Insert ignition key into driver’s


• Does tailgate unlock?

Go to Step 12. Go to Part GUNLOCK

TAILGATE.

12. • Tailgate unlocked.• Insert ignition key into driver’s


• Does tailgate lock?

Go to Step 13. Replace tailgatelock actuator,

refer toSection 1A4

REARCOMPARTMENT

LID ANDTAILGATE.

13. • Doors unlocked.• Insert ignition key into driver’s

door lock cylinder and deadlockdoors (turn key to lock twicesequentially).

• Are all doors deadlocked?

Go to Step 14. Go to Part HDEADLOCKING

DOORS.

14. • Doors deadlocked.• Insert ignition key into driver’s



System OK. Go to Part IUNLOCKING

DOORS FROMDEADLOCK.

PART A - UNLOCKING DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Uses TECH 2 to unlock all doors (establish whether problem is with the output or the input of the BCM.2. Uses TECH 2 to check for false DRIVERS UNLOCK signal.3. Checks if false DRIVERS DOOR UNLOCK signal initiated by BCM.5. Checks for battery voltage at input to BCM.6. Checks for earth to door actuators at output of BCM.7. Checks circuit 394.8. Checks for driver’s door unlock drive when commanded by TECH 2.9. Checks for passenger doors unlock drive when commanded by TECH 2.10. Checks circuits 293 and 294 / actuators.11. Checks for high current earth at BCM.12. Uses TECH 2 to check for DRIVERS DOOR UNLOCK SWITCH UNLOCK signal at microprocessor of BCM.13. Checks DRIVER’S UNLOCK SWITCH UNLOCK signal at input to BCM.14. Checks circuit 193.15. Checks circuit 156 / microswitch.16. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door actuator.17. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door lock cylinder microswitch / short to

earth, circuit 193.

UNLOCKING DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

STEP ACTION VALUE YES NO1. • Doors locked.

• Connect TECH 2 to the DLC.• Select Body / Body Control

Module / Miscellaneous Tests /Central Locking and conduct testas instructed by TECH 2 (bothdriver and all).



2. • Doors locked (driver’s door snibdown).

• With TECH 2 still connected,exit Miscellaneous Test andselect Data Display.

• Scroll to Driver’s Door UnlockSwitch.

• Does screen display Driver’sDoor Unlock Switch Unlock?


3. • With TECH 2 still connected andDriver’s Unlock Switchdisplayed, disconnect BCMconnector YB162.

• Does screen display DriversDoor Unlock Switch Unlock?


this Section.Recheck andverify repair

Go to Step 16.

4. • While conducting test in Step 1,did at least one passenger doorunlock?


5. • Back probe BCM connectorYB163, terminal B10, circuit 440(Orange/Violet wire) with aVoltmeter to earth.


12 volts Go to Step 6. Check and repaircircuit 440(includingfuse F20).

Recheck andverify repair.

STEP ACTION VALUE YES NO6. • Disconnect BCM connector

YB162.• Back probe BCM, terminal C12,

circuit 394 (Violet/White wire)with an Ohmmeter to earth.

• Is reading as specified?

Below1 ohm


7. • Reconnect BCM connectorYB162 and back probe all dooractuator connectors YB57/YB90,terminal 1, circuit 394(Violet/White wire) with anOhmmeter to earth.


Below1 ohm

Go to Step 8. Repair open incircuit 394.


8. • Doors locked.• Back probe BCM connector

YB162, terminal C3, circuit 293(Blue/Black wire) with aVoltmeter to earth

• Connect TECH 2 to DLC.• Select Body / Body Control

Module / Miscellaneous Tests /Central Lock.

• Conduct test as instructed byTECH 2 and unlock doors (bothdriver and all).


12 voltsfor 0.7

seconds

Go to Step 9. Replace BCM,refer to 2.2 LOWSERIES BCM in


9. • Door locked.• Back probe BCM connector

YB162, terminal C26, circuit 294(Black/Red wire) with aVoltmeter to earth.

• Repeat TECH 2 Central LockTest and unlock doors (bothdriver and all).


12 voltsfor 0.7

seconds



10. • Back probe all door actuatorconnectors YB57/YB90, terminal2, circuit 293 (Blue/Black wire)and circuit 294 (Black/Red wire)with a Voltmeter to earth.

• Repeat TECH 2 Central LockTest and unlock doors (bothdriver and all).


12 voltsfor 0.7

seconds

Go to door lockactuator

adjustmentprocedure inSection 1A5

FRONT & REARDOOR ASM.

Repair open incircuit 293 or 294.


11. • Back probe BCM connectorYB163, terminal B11, circuit 151(Black/Green wire) with anOhmmeter to earth.


Below1 ohm



Repair open incircuit 151.

Recheck andverify repair


• Select Body / Body ControlModule / Data Display and scrollto Driver’s Door Unlock Switch.

• Insert ignition key into driver’sdoor lock cylinder and operatedoor unlock microswitch (turnkey to unlock position).

• Does screen display Driver’sUnlock Switch Unlock?



Go to Step 13.

13. • Back probe BCM connectorYB162, terminal C20, circuit 193(Light Green/Yellow wire) withan Ohmmeter to earth.



Below1 ohm



Go to Step 14.

14. • Back probe driver’s door lockcylinder switch connector YB29,circuit 193 (Light Green/Yellowwire) with an ohmmeter to earth.

• Operate driver’s door lockswitch.

• Is vale as specified?

Below1 ohm



Go to step 15.

15. • Back probe driver’s door cylinderswitch connector YB29, circuit156 (Black/Blue wire) with anOhmmeter to earth.


Below1 ohm

Replace driver’sdoor exterior

handleassembly, referto Section 1A5




16. • With TECH 2 still connected andDriver’s Unlock Switchdisplayed, reconnect BCMconnector YB162.

• Disconnect Driver’s dooractuator connector YB57.


Go to Step 17. Go to door lockactuator

adjustmentprocedure inSection 1A5


17. • With TECH 2 still connected andDriver’s Door Unlock Switchdisplayed, disconnect driver’sdoor lock cylinder switchconnector YB29.


Check andrepair short in

circuit 193(Light Green/Yellow wire).


handle assembly,refer Section 1A5FRONT & REAR

DOOR ASM.

PART B - LOCK DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Uses TECH 2 to lock all doors (establish whether problem is with the output or the input of the BCM.2. Uses TECH 2 to check for false DEADLOCK SWITCH signal.3. Checks if false DEADLOCK SWITCH signal initiated by BCM.4. Uses TECH 2 to check for DRIVERS DOOR CLOSED signal at microprocessor of BCM.5. Checks for earth to driver’s door actuators at output of BCM.6. Checks for earth to passenger’s door actuators at output of BCM.7. Checks for door lock drive when commanded by TECH 2.8. Checks circuit 295 / actuators.10. Uses TECH 2 to check for DEADLOCK SWITCH LOCK signal at microprocessor of BCM.11. Checks DRIVER’S DEADLOCK SWITCH LOCK signal at input to BCM.12. Checks circuit 197.13. Checks circuit 156 / microswitch.14. Checks if false DEADLOCK SWITCH LOCK signal initiated by driver’s door lock cylinder microswitch / short to

earth, circuit 197.

LOCK DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

STEP ACTION VALUE YES NO1. • All doors closed.


Module / Miscellaneous Tests /Central Lock and conduct test asinstructed by TECH 2.



2. • Doors unlocked.• With TECH 2 still connected,

exit Miscellaneous Test andselect Data Display.

• Scroll to Deadlock Switch.• Does screen display Deadlock

Switch Deadlock?


3. • With TECH 2 still connected andDriver’s Lock Switch displayed,disconnect BCM connectorYB162.

• Does screen display DriversLock Switch Lock?



Go to Step 14.

4. • All doors closed.• With TECH 2 still connected,

exit Miscellaneous Test andselect Data Display.

• Scroll to DriversDoor/Passenger’s Door.

• All doors closed• Does screen display both

Driver’s Door Closed andPassenger’s Door Closed?

Go to Step 5 Go to Step 9.


YB162.• Back probe BCM terminal C3,

circuit 293 (Blue/Black wire) withan Ohmmeter to earth.


Below1 ohm



6. • Back probe BCM terminal C26,circuit 294 (Black/Red wire) withan Ohmmeter to earth.


Below1 ohm



7. • Reconnect BCM connectorYB162.

• All doors closed.• Connect TECH 2 to the DLC.• Select Body / Body Control


• Back probe BCM connectorYB162, terminal C13, circuit 295(Black/Yellow wire) with a Referto 2.2 to earth.

• Conduct door lock test asinstructed by TECH 2 and lockall doors.


12 voltsfor 0.7

seconds



8. • With TECH 2 still connected andMiscellaneous Tests / CentralLocking selected, back probe alldoor actuator connectorsYB90/YB57, terminal 6, circuit295 (Black/Yellow wire) with aVoltmeter to earth.

• Conduct door lock actuator testas instructed by TECH 2.


12 voltsfor 0.7

seconds


adjustmentprocedure inSection 1A5FRONT ANDREAR DOORASSEMBLIES.

Check and repairopen in circuit 295


9. • With TECH 2 still connected andData Display Selected, scroll toDriver’s Door and PassengerDoor display.

• Disconnect BCM connectorYB162.

• Does screen display bothDriver’s Door Closed andPassenger’s Door Closed?

Check andrepair faulty doorjamb switches,

or short toground in circuit

125/126.Recheck andverify repair.



10. • With TECH 2 still connected andData Display selected, scroll toDeadlock Switch.

• Insert ignition key into driver’sdoor lock cylinder and operatedoor lock microswitch (turn keyto lock position).

• Does screen display DeadlockSwitch Deadlock?



Go to Step 11.

STEP ACTION VALUE YES NO11. • Back probe BCM connector

YB162, terminal C22, circuit 197(Brown/White wire) with anOhmmeter to earth.



Below1 ohm



Go to Step 12.

12. • Back probe driver’s door lockcylinder switch connector YB29,circuit 197 (Brown/White wire)with an Ohmmeter to earth.



Below1 ohm



Go to Step 13.

13. • Back probe driver’s door lockcylinder switch connector YB29,circuit 156 (Blue/Black wire) withan Ohmmeter to earth.


Below1 ohm


handleassembly, refer

Section 1A5FRONT ANDREAR DOORASSEMBLIES.



14. • With TECH 2 still connected andDriver’s Lock Switch displayed,reconnect BCM connectorYB162.

• Disconnect Driver’s door lockcylinder switch connector YB29.

• Does screen display DeadlockSwitch Deadlock?

Repair short toearth in

circuit 197.Recheck andverify repair.


handle assembly,refer Section 1A5

FRONT ANDREAR DOORASSEMBLIES.

PART C - UNLOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Checks driver’s door snib unlock signal (earth) at driver’s door actuator when operating driver’s door snib

UNLOCK.2. Checks circuit 156 / driver’s door actuator.

UNLOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)


• Back probe driver’s dooractuator connector YB57,terminal 3, circuit 193 (LGreen/Yellow wire) with anOhmmeter to a sound earth.

• Unlock doors using driver’s snibbutton.


Below1 ohm

Check andrepair open in


Go to Step 2.

2. • Back probe driver’s dooractuator connector YB57,terminal 5, circuit 156(Black/Blue wire) with anOhmmeter to earth.


Below1 ohm



Check and repairopen in circuit

156. Recheck andverify repair.

PART D - LOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Uses TECH 2 to check for false LOCK SWITCH STATUS LOCK signal.2. Checks if false LOCK SWITCH STATUS LOCK signal initiated by BCM.3. Uses TECH 2 to check for LOCK SWITCH STATUS LOCK signal at microprocessor of BCM.4. Checks for LOCK SWITCH STATUS LOCK signal at input to BCM.5. Checks circuit 195 / driver’s door actuator.6. Checks if false LOCK SWITCH STATUS LOCK signal initiated by driver’s door actuator.7. Checks if false LOCK SWITCH STATUS LOCK signal initiated by LHF passenger door / short to earth in circuit

195.

LOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)



Module / Data Display and scrollto Lock Switch Status.

• Does screen display LockSwitch Status Lock?


2. • With TECH 2 still connected andLock Switch Status displayed,disconnect BCM connectorYB162.




Go to Step 6.

STEP ACTION VALUE YES NO3. • Lock doors using driver’s snib

button.• Does screen display Lock

Switch Status Lock?



Go to Step 4.

4. • Back probe BCM connectorYB162, terminal C21, circuit 195(Brown/Red wire) with anOhmmeter to earth.

• Lock doors using driver’s snibbutton.


Below1 ohm



Go to Step 5.

5. • Back probe driver’s dooractuator connector YB57,terminal 4, circuit 195(Brown/Red wire) with anOhmmeter to earth.

• lock doors using driver’s snibbutton.


Below1 ohm





6. • With TECH 2 still connected andLock Switch Status displayed,reconnect BCM connectorYB162.





7. • With TECH 2 still connected andLock Switch Status displayed,disconnect LHF passenger dooractuator connector YB57.


Check andrepair short to

earth incircuit 195.




PART E - UNLOCK DOOR, PASSENGER DOOR ACTUATORS (SNIB)

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.2. Checks non operating passenger door snib unlock signal (earth) at non operating actuator when operating it’s

snib UNLOCK3. Uses TECH 2 to check for false PASSENGER UNLOCK SWITCH UNLOCK (passenger doors) signal.4. Checks if false PASSENGER UNLOCK SWITCH UNLOCK signal initiated by BCM.5. Uses TECH 2 to check for PASSENGER UNLOCK SWITCH UNLOCK signal at microprocessor of BCM while

operating each of the passenger door snibs.6. Checks for PASSENGER UNLOCK SWITCH UNLOCK signal at input to BCM while operating each of the

passenger door snibs.7. Checks circuit 194.8. Checks circuit 156 / each passenger door actuator9. Checks if false PASSENGER UNLOCK SWITCH UNLOCK signal initiated by any of the passenger door

actuators / short to earth in circuit 194.10. Checks circuit 156 / passenger door actuator (non operating door actuator).

UNLOCK DOOR, PASSENGER DOOR ACTUATORS (SNIB)


• Unlock each passengerdoor using each snibbutton.

• Does at least onepassenger door snibunlock all doors?


2. • All door lock snibs down.• Back probe actuator

connector, terminal 3 ofsuspect door actuator(unlock switch), circuit 194(Brown/Orange wire) withan Ohmmeter to earth.

• Operate suspect door locksnib button.


Below1 ohm



Go to Step 10.

3. • All doors locked.• Connect TECH 2 to DLC.• Select Body / Body

Control Module / DataDisplay.

• Scroll to Passenger DoorUnlock Switch.

• Does screen displayPassenger Door UnlockSwitch Unlock?


4. • With TECH 2 stillconnected and PassengerDoor Unlock Switchdisplayed, disconnectBCM connector YB162.

• Does screen displayPassenger Door UnlockSwitch Unlock?




• With TECH 2 stillconnected and PassengerDoor Unlock Switchdisplayed unlock eachpassenger door usingeach snib button.

• Does the screen displayPassenger Door UnlockSwitch Unlock for at leastone of the passengerdoors?



Go to Step 6.

6. • All doors locked.• Back probe BCM

connector YB162,terminal C9, circuit 194(Brown/Orange wire) withan Ohmmeter to earth.

• Unlock each doors usingeach snib button.

• Is value as specified for atleast one of theactuators?

NOTE:Lock each door lock actuatorafter each test.

Below1 ohm



Go to Step 7.

7. • Back probe eachpassenger door actuatorconnector, terminal 3,circuit 194 (Brown/Orangewire) with an Ohmmeter toearth.

• Unlock each passengerdoors using each snibbutton.

• Is the reading as specifiedfor all actuators?

NOTE:Lock each door lock actuatorafter each test.

Below1 ohm



Go to Step 8.

8. • Back probe eachpassenger door actuatorconnector, terminal 5,circuit 156 (Black/Bluewire) with an Ohmmeter toearth.

• Is the reading as specifiedfor all actuators?

Below 1ohm





STEP ACTION VALUE YES NO9. • Reconnect BCM

connector YB162.• With TECH 2 still

connected and PassengerDoor Unlock Switchdisplayed, disconnecteach passenger dooractuator connector one ata time.

• Does screen displaychange from PassengerDoor Unlock SwitchUnlock to Passenger DoorUnlock Switch Off whendisconnecting any of thepassenger door actuatorconnectors?


adjustmentprocedure inSection 1A5FRONT ANDREAR DOORASSEMBLIES.Check actuatorwhich caused

display tochange fromUNLOCK to

OFF.

Check and repairshort to earth in


10. • Back probe actuatorconnector, terminal 5 ofsuspect door actuator/s,circuit 156 (Black/Bluewire) with an Ohmmeter toearth.


Below1 ohm


adjustmentprocedure inSection 1A5FRONT ANDREAR DOORASSEMBLIES.Check suspect

actuator/s.



PART F - LOCK DOORS, LHF PASSENGER DOOR ACTUATOR (SNIB)

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Checks LHF passenger door snib lock signal (earth) when operating it’s snib button.

LOCK DOOR, LHF PASSENGER DOOR ACTUATOR (SNIB)

STEP ACTION VALUE YES NO

1. • All doors closed.

• All door lock snibs up.

• Back probe LHF passenger dooractuator connector YB57,terminal 4, circuit 195(Brown/Red wire) with anOhmmeter to earth.

• Lock LHF passenger door usingit’s snib button.

• Is the reading as specified?

Below1 ohm





Check LHFpassenger door

actuator.

PART G - UNLOCK TAILGATE

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Checks for unlock drive at rear compartment lock actuator when commanded by TECH 2.2. Checks for earth at rear compartment lock actuator.

UNLOCK TAILGATE


1. • Doors and tailgate locked.

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROLMODULE / MISCELLANEOUSTEST / CENTRAL LOCK.

• Back probe tailgate lock actuatorconnector YR35, terminal 1,circuit 294 (Black/Red wire) with aVoltmeter to earth.

• Conduct door unlock test asinstructed by TECH 2.

• Is the voltage as specified?

12 voltsfor 0.7

seconds



2. • Back probe tailgate lock actuatorconnector YR35, terminal 2,circuit 295 (Black/Yellow wire)with an Ohmmeter to earth.


Below1 ohm

Replace tailgatelock actuator,

refer toSection 1A4

REARCOMPARTMENT

LID ANDTAILGATE.

Check and repairopen in


PART H - DEADLOCKING DOORS

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Uses TECH 2 to check for false IGNITION ON signal at microprocessor of BCM.2. Checks for correct IGNITION SIGNAL at input of BCM.3. Checks for deadlock drive at output of BCM when commanded by TECH 2.

DEADLOCKING DOORS


1. • Turn ignition OFF.

• Connect TECH 2 to DLC.

• Select BODY / BODYCONTROL MODULE / DATADISPLAY and scroll toIGNITION SWITCH.

• Does screen display IGNITIONSWITCH ON?


2. • Back probe BCM connectorYB164, terminal D6, circuit 39(Pink/Black wire) with aVoltmeter to earth.


TurnignitionOFF.

0 volts

Turnignition

ON.12 volts



Check and repairshort to battery

positive, circuit 39/ ignition switch.


3. • All doors unlocked / closed.

• With TECH 2 still connected,exit Data Display and selectmiscellaneous tests / centrallock.

• Back probe BCM connectorYB162, terminal C12, circuit 394(Violet/White wire) with aVoltmeter to earth.

• Conduct test and instructed byTECH 2 and deadlock doors.


12 voltsfor 0.7

seconds


adjustmentprocedure inSection 1A5FRONT ANDREAR DOORASSEMBLIES



PART I - UNLOCKING DOORS FROM DEADLOCK

TEST DESCRIPTIONThe numbers below refer to step numbers in the following diagnostic chart.1. Uses TECH 2 to unlock all doors (establish whether problem is with the output or the input of the BCM.2. Uses TECH 2 to check for false DRIVER’S DOOR UNLOCK signal.3. Checks if false DRIVER’S DOOR UNLOCK signal initiated by BCM.5. Checks for battery voltage at input to BCM.6. Checks for high current earth at BCM.7. Checks for earth to door actuators at output of BCM.8. Checks for earth to door actuators at output of BCM.9. Checks circuit 394.10. Checks circuit 295.11. Checks for drivers door unlock drive at output of BCM when commanded by TECH 2.12. Checks for passenger doors unlock drive at output of BCM when commanded by TECH 2.13. Checks circuits 294 and 293 / all door actuators by commanding unlock via TECH 2.14. Uses TECH 2 to check for DRIVER’S DOOR UNLOCK SWITCH UNLOCK signal at microprocessor of BCM.15. Checks DRIVER’S DOOR UNLOCK SWITCH UNLOCK signal at input to BCM.16. Checks circuit 193.17. Checks circuit 156 / microswitch.18. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door actuator.19. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door lock cylinder microswitch / short to

earth, circuit 193.

UNLOCKING DOORS FROM DEADLOCK

STEP ACTION VALUE YES NO1. • Doors deadlocked.



• Conduct all doors unlock test asinstructed by TECH 2.



STEP ACTION VALUE YES NO2. • Doors unlocked.

• With TECH 2 still connected,exit Miscellaneous Test andselect Data Display.

• Scroll to Driver’s Door UnlockSwitch.



3. • With TECH 2 still connected andDriver’s Unlock Switchdisplayed, disconnect BCMconnector YB162.




Go to Step 18.

4. • While conducting test in Step 1,did at least one passenger doorunlock?


5. • Back probe BCM connectorYB163, terminal B10, circuit 440(Orange/Violet wire) with aVoltmeter to earth.


12 volts Go to Step 6. Check and repaircircuit 440(includingfuse F20).


6. • Back probe BCM connectorYB163, terminal B11, circuit 151(Black/Green wire) with anOhmmeter to earth.


Below1 ohm

Go to Step 7. Check and repaircircuit 151.


7. • Disconnect BCM connectorYB162.

• Back probe terminal C12, circuit394 (Violet/White wire) with anOhmmeter to earth.


Below1 ohm



8. • Back probe BCM terminal 13,circuit 295 (Black/Yellow wire)with an Ohmmeter to earth.


Below1 ohm



9. • Back probe all door actuatorconnectors YB57/YB90, terminal1, circuit 394 (Violet/White wire)and BCM terminal C12 with anOhmmeter.


Below1 ohm



10. • Back probe all door actuatorconnectors YB57/YB90, terminal6, circuit 295 (Black/Yellow wire)and BCM terminal C13 with anOhmmeter.


Below1 ohm




YB162.• Back probe BCM connector

YB162, terminal C3, circuit 293(Blue/Black wire) with aVoltmeter to earth.

• Select Body / Body ControlModule / Miscellaneous Test /Central Lock.

• Conduct test as instructed byTECH 2.


12 voltsfor 0.7

seconds



12. • Back probe BCM connectorYB162, terminal C26, circuit 294(Black/Red wire) with aVoltmeter to earth.

• Repeat TECH 2 Central Locktest and lock doors.


12 voltsfor 0.7

seconds



13. • Back probe all door actuatorconnectors YB57/YB90, terminal2, circuit 293 (Blue/Black wire)and circuit 294 (Black/Red wire)with a Voltmeter to earth.

• Repeat TECH 2 Central Locktest and lock doors.


12 voltsfor 0.7

seconds



Repair open incircuit 293 or 294.


14. • With TECH 2 still connected andDriver’s Door Unlock Switchdisplayed, insert ignition key intodriver’s door lock cylinder andoperate door unlock microswitch(turn key to unlock position).




Go to Step 15.

15. • Back probe BCM connectorYB162, terminal C20, circuit 193(Light Green/Yellow wire) withan Ohmmeter to earth.



Below1 ohm



Go to Step 16.

16. • Back probe driver’s door lockcylinder switch connector YB29,circuit 193 (Light Green/Yellowwire) with an Ohmmeter to earth.



Below1 ohm



Go to Step 17.

STEP ACTION VALUE YES NO17. • Back probe driver’s door lock

cylinder switch connector YB29,circuit 156 Black(/Blue wire) withan Ohmmeter to earth.


Below1 ohm






18. • With TECH 2 still connected andDriver’s Door Unlock Switchdisplayed, reconnect BCMconnector YB162.




adjustmentprocedure inSection 1A5FRONT ANDREAR DOORASSEMBLIES

19. • With TECH 2 still connected andDriver’s Door Unlock Switchdisplayed, disconnect driver’sdoor lock cylinder switchconnector YB29.


Check and repairshort in circuit 193

(Light Green/Yellow wire).




4.4 BOOT RELEASE

Figure 12J-1-94

CIRCUIT DESCRIPTION:The rear compartment lock actuator is controlled by pressing the rear compartment lock switch located in the glovecompartment. The BCM will monitor the rear compartment lock switch and inhibit the boot release if the vehiclespeed is above 15 km/h.

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-2 Functional check to determine if system is functioning correctly or if faulty, determines if fault is with remote

receiver/key or with boot release system.3. Uses TECH 2 to operate the rear compartment lock actuator to establish whether problem is with the input or

output of BCM.4. Uses TECH 2 to check BOOT RELEASE SWITCH ON signal at microprocessor of BCM.5. Checks for rear compartment lock actuator drive signal at the output of the BCM when commanded by TECH

2.6. Checks circuit 142.7. Checks circuit 156 and rear compartment lock actuator.8. Checks for battery voltage supply at BCM (turn signal / boot solenoid supply).9. Checks for BOOT SWITCH signal at input of BCM.10. Checks circuit 1144.11. Checks circuit 155 and rear compartment lock switch.

Figure 12J-1-95

BOOT RELEASE

STEP ACTION VALUE YES NO1. • Activate boot release lock switch

in glove compartment with vehiclespeed below 15 km/h.

• Does the rear compartment lidopen?


2. • Close rear compartment lid.• Press the boot release button on

the remote coded key (within twometres of the rear of the vehicle).

• Does rear compartment lid open?

System OK. Go to remotereceiver

diagnosis, referto 4.6 REMOTE

RECEIVER/KEY in this

Section.3. • Connect TECH 2, ignition ON.

• Select Body / Body ControlModule / Miscellaneous Tests /Security System / Boot Release.


• Does boot lid open?


4. • With TECH 2 still connected, exitMiscellaneous Tests, select DataDisplay and scroll to BootRelease Switch.

• Press boot release button in glovecompartment.

• Does the screen display changeto Boot Release Switch On?



Go to Step 9.

5. • Back probe BCM connectorYB162, terminal C25, circuit 142(Red/Green wire) with a Voltmeterto earth.

• Repeat TECH 2 Boot Releasetest and press release button inglove compartment.

• Are voltages as specified?

Test notconducted

0 voltsTest

conducted12 volts


6. • Back probe actuator connectorYR6, circuit 142 (Red/Green wire)with Voltmeter to earth.

• Repeat TECH 2 Boot Releasetest and press release button inglove compartment.


Test notconducted

0 voltsTest

conducted12 volts

Go to Step 7. Repair open orshort in


7. • Back probe actuator connectorYR6 circuit 156 (Black/Blue wire)with an Ohmmeter to earth.


Below1 ohm

Replace rearcompartment lockactuator, refer to

Section 1A4 REARCOMPARTMENT

LID ANDTAILGATE.



8. • Back probe BCM connectorYB163, terminal B5, circuit 140(Orange/Red wire) with aVoltmeter to earth.


battery + Replace BCM,refer to 2.2 LOWSERIES BCM in


Check andrepair open orshort in circuit140 (including

fuse F7).Recheck andverify repair.


YB164, terminal D16, circuit 1144(Black/Red wire) with anOhmmeter to earth.

• Activate the rear compartmentlock switch.


Below1 ohm



Go to Step 10.

10. • Back probe rear compartmentlock switch connector YB13,circuit 1144 (Black/Red wire) witha Ohmmeter to earth.

• Activate the rear compartmentlock switch.


Below1 ohm

Repair open orshort in circuit1144. Recheckcircuit to verify

repair.

Go to Step 11.

11. • Back probe rear compartmentlock switch connector, YB13,circuit 155 (black/Yellow wire)with an Ohmmeter to earth.


Below1 ohms

Replace rearcompartment lock

switch, refer toSection 1A4 REARCOMPARTMENT

LID ANDTAILGATE.



4.5 THEFT DETERRENT

Figure 12J-1-96

CIRCUIT DESCRIPTION:The theft deterrent system can be armed by pressing the lock button on the remote coded key when the driver’sdoor is closed or passively armed automatically by the BCM 30 seconds after the ignition is switched off. When thesystem is armed, the Powertrain Control Module (PCM) prevents the engine from starting.The theft deterrent system can be disarmed in three ways:-By pressing the unlock button on the remote coded key. This will unlock doors, turn the interior light on and disarmthe system for 30 seconds.By inserting the remote coded key into the ignition switch cylinder and turning the ignition to the ON position. Thiscauses the BCM to read a security code serial data output from the remote coded key contact pin, via the remotecoded key reader assembly.The system can also be disarmed by turning the ignition on for approximately two hours (timed override).Should the system not disarm (theft deterrent LED off) when the ignition switch is turned to the ON position (ie. dueto a misaligned or faulty remote coded key reader or faulty remote coded key), then press the button on the remotekey to disarm the theft deterrent system.The remote coded key is powered by it’s own internal battery. If the battery fails, the remote coded key can bepowered by the remote coded key reader once the key is inserted into the ignition cylinder and turned to either theON or START positions.When pressing the lock button on the remote coded key to arm the system, the indicators will flash once and thetheft deterrent alert indicator (LED) will begin to flash.When pressing the unlock button on the remote coded key to disarm the system, the indicators will flash twice andthe theft deterrent alert indicator (LED) will go out.When the ignition is turned on, the BCM polls the PCM and sends an encrypted BCM remote coded key securitycode.The PCM compares the received security code with it’s stored security code (configured in production or via TECH2) and if the codes match, the PCM will enable injector fuelling and engine crank.The PCM will return an OK TO START message which tells the BCM to jump from the SHORT LOOP mode to theLONG LOOP mode.

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-10 Functional check of system.11. Checks if doors are not locking due to central door locking system or remote receiver/remote key.12. Re-synchronisation of remote key rolling code in event of rolling code misalignment.14. Uses TECH 2 to operate indicators (establish whether problem is with the BCM or other external problem).15. Checks turn signal input at input to BCM.16. Checks turn signal output at output of BCM when commanded by TECH 2.17. Uses TECH 2 to operate the theft deterrent LED (establish whether problem is with the BCM or other external

problem).18. Checks for theft deterrent LED output drive form the BCM when commanded by TECH 2.19. Checks for short to earth in circuit 263 causing LED to be faulty.20. Checks circuit 263.21. Checks circuit 156 for open to establish if circuit is faulty or theft deterrent LED is faulty.22. Checks if problem is confined to the key reader or remote serial data transfer.23. Checks for poor remote coded key shaft earth contact.24. Checks for poor contact of remote coded key pin with remote coded key reader.25. Checks if problem is with remote coded key by trying a known good remote coded key.26. Checks for BCM signal at remote key reader.27. Checks ignition switch/cylinder earth.28. Uses TECH 2 to check IGNITION ON signal at microprocessor of BCM.29. Checks circuit 229 for open to establish if circuit is faulty or BCM is faulty.30. Checks for short to earth in circuit 229.31. Checks ignition ON signal at input to BCM.32. Uses TECH 2 to check for PASSIVE MODE OFF signal at microprocessor of BCM to establish if fault is with

the BCM or PCM.

Figure 12J-1-97

THEFT DETERRENT

STEP ACTION VALUE YES NO1. • Close and lock all doors.

• Operate remote key UNLOCKbutton within 4 meters of thedriver’s side B pillar.

• Does the driver’s door unlock (2stage unlocking programmed) orall doors unlock (single stageunlocking programmed)?


2. • In Step 1, did all indicator lightsflash twice (both left and righthand sides)?


3. • In Step 1, did the dome lampilluminate?

Go to Step 4. Go to dome lampdelay diagnosis,refer 4.12 DOME

LAMP DELAYCONTROL in this

Section.4. • In Step 1, did the theft deterrent

LED go out immediately andbegin flashing 30 seconds latter?


5. • Close all doors.• Arm theft deterrent system by

operating the LOCK button onthe remote coded key within 4metres of the driver’s side Bpillar.

• Did all doors lock?

Go to Step 6. Go to centraldoor locking

diagnosis, referto 4.3 CENTRALDOOR LOCKING

in this Section.

STEP ACTION VALUE YES NO6. • In Step 5, did the dome lamp go

out immediately upon activatingthe lock button?

Go to Step 7. Go to dome lampdelay diagnosis,refer 4.12 DOME

LAMP DELAYCONTROL in this

Section.7. • In Step 5, did all indicator lights

flash once (both left and righthand sides)?



8. • Is the theft deterrent LEDflashing?



9. • Unlock vehicle with remotecoded key and wait for thevehicle to passively arm (theftdeterrent LED flashing).

• With vehicle passively armed),insert the ignition key into ignitionswitch and turn to the ONposition.

• Does the theft deterrent LEDextinguish?


10. • Turn the ignition key to theSTART position.

• Does the vehicle crank andstart?


11. • Insert ignition key into driver’sdoor lock cylinder and operatedoor unlock microswitch (turnkey to unlock position).


Go to Step 12. Go to centraldoor locking

diagnosis, referto 4.3 CENTRALDOOR LOCKING

in this Section.12. • Insert ignition key into ignition

switch and cycle from OFF - ON- OFF.

• Remove key and lock doors withdriver’s door lock cylinder switch.

• Operate UNLOCK button onremote key within 4 metres ofdriver’s door B pillar.

• Does the driver’s door unlock (2stage unlocking programmed) orall doors unlock (single stageunlocking programmed)?

Go to Step 2. Go to remotereceiver


13. • In Step 2, did at least one side ofvehicle’s indicators flash twice(either left or right hand side)?


STEP ACTION VALUE YES NO14. • Driver’s door closed.


Module / Miscellaneous Tests /Lamps / Indicators.


• Do all indicator lights illuminate?

Go to CentralDoor Locking

diagnosis. Referto 4.3 CENTRALDOOR LOCKINGin this Section..

Go to Step 15.

15. • Back probe BCM connectorYB163, terminal B5, circuit 140(Orange/Red wire) with aVoltmeter to earth.


Approx.12 volts

Go to Step 16. Check and repairopen in circuit140 (including

fuse F7),recheck andverify repair.

16. • Back probe BCM connectorYB163, terminals B12 and B4,circuits 14 & 15 (Light Blue wireand Blue wire respectively) witha Voltmeter to earth.

• Repeat Tech 2 IndicatorIllumination test as per Step 14.


Approx.12 volts

Check andrepair circuits

14 (LH indicator)and/or

15 (RH indicator).Recheck andverify repair



17. • Connect TECH 2 to DLC.• Select Body / Body Control

Module / Miscellaneous Tests /Security System / Security LED.


• Does theft deterrent LEDilluminate?



Go to Step 18.

18. • Back probe BCM connectorYB165, terminal A8, circuit 263(Light Blue wire) with a Voltmeterto earth.

• Repeat Security LED test as perStep 17.


Approx5 voltsLED onApprox 0 voltsLED off


19. • Back probe BCM connectorYB165, terminal A8, circuit 263(Light Blue wire) with anohmmeter to earth.


Below1 ohm.

Repair short incircuit 263.




20. • Back probe theft deterrent LEDconnector YB56, circuit 263(Light Blue wire) with a Voltmeterto earth.

• Repeat Security LED test as perStep 17.


Approx5 voltsLED onApprox0 voltsLED off

Go to Step 21. Check and repairopen in circuit263. Recheck

and verify repair.

21. • Back probe theft deterrent LEDconnector YB56, circuit 156(Black/Yellow wire) with aOhmmeter to earth.


Below1 ohm

Replace theftdeterrent LED,

refer to 12CINSTRUMENTS,

WIPERS /WASHER &



HORN.

STEP ACTION VALUE YES NO22. • With the ignition key in the ON

position, operate the unlockbutton on the remote coded key.

• Does the theft deterrent LED goout?

Go to Step 23. Go to remotereceiver


23. • Remove remote key, key shaftand clean earth contact (shaftearth).

• Reinstall key shaft and tightenscrews to the correct torquespecification (0.7 - 0.9 Nm).

• With system passively armed(theft deterrent LED flashing),insert key into ignition switch andturn key to the ON position.

• Does the theft deterrent LED goout?


24. • Turn ignition key to the ONposition.

• Visually check to see if remotecoded key contact pin is makinggood contact with remote keyreader (slip ring).

• Is remote coded key contact pinmaking good contact?

Go to Step 25. Check andrepair: remotekey reader or

align. of remotekey reader (referstep 12) or length

of key shaft orremote keycontact pin

25. • Check function of second remotekey.

• Is second key OK?

Replace remotecoded key, referto 2.3 REMOTECODED KEY in

this Section.

Go to Step 26

26. • Isolate remote coded key contactpin (use a thick piece of paper tocover pin).

• Insert key into ignition switch andturn key to the ON position.

• Measure voltage at the remotecoded key reader (slip ring) to asound earth.


Fluctuatesbetween

4 - 6 voltsAC


27. • Check ignition switch earth usingan Ohmmeter connectedbetween the ignition switchhousing a sound earth point.


Below100 ohms



Check and repairopen or poor

earth connectionat ignition switch.



Module / Data Display.• Turn ignition ON as instructed by

TECH 2.• Scroll to Ignition Switch display.• Does screen display Ignition

Switch On?



YB164, terminal D12, circuit 229(Violet/Red wire) with aVoltmeter to earth.

• With remote coded key contactpin isolated (covered with thickpaper), insert ignition key intoignition switch and turn ignitionswitch to the ON position.


Fluctuatesbetween

4 - 6 voltsAC

Check and repairopen in circuit229 or remote

key reader,Recheck andverify repair.

Go to Step 30.

30. • Check circuit 229 (Violet/Redwire) for short to earth.


Check and repairshort in circuit229. Recheck

and verify repair.




• Turn ignition ON.• Is voltage as specified?

Approx.12 volts




(includingfuse F14).



Module / Data Display and scrollto Passive Mode.

• With system disarmed (theftdeterrent LED off), does thescreen display Passive ModeOFF?


POWERTRAINMANAGEMENT -

V6 ENGINEor

Section 6C2POWERTRAIN

MANAGEMENT -V8 ENGINE



4.6 REMOTE RECEIVER/KEY

Figure 12J-1-98

CIRCUIT DESCRIPTION:When operating the UNLOCK button on the remote coded key within four metres of the driver’s side B pillar for 0.25seconds, a Radio Frequency (RF) signal is transmitted. The BCM receives this unlock request from the remotecoded key via the remote receiver, located in the instrument panel between the demist grille. The BCM thenproceeds to unlock all the doors (single stage unlock) or just the driver’s door (two stage unlock), disarm the theftdeterrent system, turn on the dome lamp and flash the indicators twice.When operating the LOCK button on the remote coded key within four meters of the driver’s door B pillar for 0.25seconds, an RF signal is again transmitted. The RF signal (lock request) is received by the BCM via the remotereceiver. The BCM then proceeds to lock all doors, arm the theft deterrent system, turn the dome lamp off (ifilluminated) and flash the indicators once.When operating the boot release button on the remote coded key within two meters of the boot for 0.5 seconds, anRF signal is transmitted to the BCM via the remote receiver. The BCM then proceeds to activate the rearcompartment lock actuator (provided the vehicle speed is less than 15 km/h).The remote coded key is powered by it’s own internal battery. If this battery fails, no RF signal will be transmittedwhen operating the lock, unlock and boot release buttons. However, if the battery does lose power, the remotecoded key reader has the ability to power the key once it is inserted into the ignition switch key cylinder and turnedto the IGN or START positions. This will then enable theft deterrent disarming.

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-7. Functional check to determine if system is functioning correctly or if faulty, determines if fault is with remote

receiver/key, central locking system or theft deterrent system.8. Uses TECH 2 to check remote key signal - establish whether problem is with BCM or if further diagnosis is

required.9. Uses TECH 2 to check for a remote key signal from a fully functional VT Series vehicle to establish whether

problem is with remote key or if further diagnosis is required.10. Checks for power supply to remote receiver.11. Checks circuit 271.12. Checks circuit 266.13. Checks if problem is due to faulty BCM or remote receiver by swapping remote receiver with a fully functional

unit.

Figure 12J-1-99

REMOTE RECEIVER/KEY

STEP ACTION VALUE YES NO1. • Close and lock all doors.

• Insert ignition key into driver’sdoor lock cylinder switch.

• Operate unlock / lock.• Do all doors unlock and lock?

Go to Step 2. Go to central doorlocking diagnosis,

refer to 4.3CENTRAL DOORLOCKING in this

Section.

2. • Insert ignition key into driver’sdoor lock cylinder switch andunlock door.

• With theft deterrent LEDflashing, insert ignition key intoignition switch and turn key tothe ON position.

• Does the theft deterrent LEDturn off?

Go to Step 3. Go to theftdeterrent

diagnosis, refer to4.5 THEFT


STEP ACTION VALUE YES NO3. • Insert ignition key into driver’s

door lock cylinder switch andlock all doors.

• Operate the UNLOCK button onthe remote coded key within 2metres of the driver’s door Bpillar.

• Does the driver’s door only (twostage unlock) or all doors (singlestage unlock) unlock?


4. • When performing Step 3, did allof the following occur when theUNLOCK button on the remotecoded key was pressed?

Indicators flash twice.Dome lamp illuminate (domelamp switch in doors position).Theft deterrent LED go out.




5. • Close all doors.• Operate LOCK button on remote

coded key within 2 metres ofdriver’s door B pillar.



6. • When performing Step 5, did allof the following occur when theLOCK button on the remotecoded key was pressed?

Theft deterrent LED beganflashing.Indicators flashed once.Dome lamp went out (ifilluminated & with switch in thedoors position).




7. • Press the boot release button onthe remote coded key (within twometres of the rear of the vehicle)for two seconds.

• Does rear compartment lid lockactuator solenoid activate?


8. • Connect TECH 2 to the DLC.• Select Body / Body Control

Module / Data Display.• Scroll to Remote Door Signal

and Remote Boot Signal screendisplay.

• Operate UNLOCK, LOCK andBOOT buttons on the remotecoded key.

• Does the screen display changefor the remote door signalchange from Off to Unlock /Lock to Off and the remote bootsignal change from Off to Opento Off?



Go to Step 9.

STEP ACTION VALUE YES NO9. • On a VT Series vehicle with a

fully functional remote coded keyand receiver, connect TECH 2 tothe DLC.

• Select Body / Body ControlModule / Data Display.

• Scroll to Remote Door Signaland Remote Boot Signal screendisplay.

• Operate UNLOCK, LOCK andBOOT buttons on the remotecoded key.

• Does the screen display changefor the remote door signalchange from Off to Unlock /Lock and the remote boot signalchange from Off to Invalid toOff?

Go to Step 10. Programme anew remote

coded key, referto 2.3 REMOTECODED KEY in


10. • Return to original vehicle withsuspected faulty remote codedkey/receiver.

• Back probe remote receiverconnector YB95, circuit 740(Orange/Black wire) with aVoltmeter to earth.


battery + Go to Step 11. Check and repairopen or short in

circuit 740.recheck and verify

repair.

11. • Check integrity of circuit 271(Brown/Green wire).


Below1 ohm

Go to Step 12. Repair circuit 271as necessary.Recheck andverify repair.

12. • Check integrity of circuit 266(Yellow wire).


Below1 ohm

Go to Step 13. Repair circuit 266as necessary.Recheck andverify repair.

13. • Replace remote receiver with aknown functional one andconnect TECH 2 to the DLC.

• Select Body / Body ControlModule / Data Display.

• Scroll to Remote Door Signalscreen display.

• Operate UNLOCK and LOCKbutton on the remote coded key.

• Does the screen display changefrom Off to Unlock / Lock Off?

Replace remotereceiver, refer to

2.5 REMOTERECEIVER

MODULE in thisSection.




4.7 HEATED REAR WINDOW

Figure 12J-1-100

CIRCUIT DESCRIPTION:Driver control of the rear window demister is from the heated rear window switch located in the instrument facia.Pressing this momentary type contact switch will toggle the heating element in the rear window ON and OFF. Theheating is allowed to continue for 15 minutes and each new activation of the switch resets the delay timer. Thedemisting of the rear window is only allowed when the ignition is ON and defaults to the OFF state when the ignitionis cycled from OFF to ON.

TEST DESCRIPTION:The numbers below refer to step numbers in thefollowing diagnostic chart.1 & 2 Functional check of heated rear window

system.3. Uses TECH 2 to check for the heated rear

window switch input at the microprocessor ofthe BCM when the switch is activated.

4. Checks the heated rear window drive signal atthe output of the BCM when connected toTECH 2.

5. Checks circuit 292 (Black/Red wire).6. Checks the heated rear window LED (in the

momentary switch).8. Checks the heated rear window switch input,

at input of BCM.9. Checks circuit 291 (Orange wire).10. Checks heated rear window switch.11. Checks circuit 44 (Pink/Blue wire).13. Checks for B+ at relay.14. Checks heated rear window relay.15. Checks circuit 192.16. Checks circuit 185.17. Checks circuit 40/fuse F22.18. Checks circuit 44.19. Checks circuit 292. Figure 12J-1-101

HEATED REAR WINDOW


• Operate the heated rear windowswitch.

• Does the LED illuminate?


2. • Does the rear window demist? System OK. Go to Step 12.

3. • Turn ignition ON.• Connect TECH 2 to DLC.• Select Body / Body Control

Module / data Display and scrollto heated Rear Window Switch.

• Depress and hold the heatedrear window switch.

• Does TECH 2 display HeatedRear Window Switch On?


4. • Ignition ON.• Back probe BCM connector

YB165, terminal A1, circuit 292(Black/Red wire) with jumperlead connected to earth.

• Does heated rear window LEDilluminate?



Go to Step 5.

5. • Back probe heated rear windowswitch connector YB54, circuit292 (Black/Red wire) withjumper lead connected to earth.

• Repeat TECH 2 Heated RearWindow test and turn heatedrear window On.


0 volts Repair open incircuit 292.

Recheck circuitand verify repair.

Go to Step 6.

6. • Turn ignition ON.• Back probe heated rear window

switch connector YB54, circuit44 (Pink/Blue wire) withVoltmeter to earth.


12 volts Replace heatedrear window

switch.Recheck circuitto verify repair.

Go to Step 7.

7. • Check fuse F13.• Is fuse OK?



Replace fuse F13.Recheck circuit to

verify repair.

8. • Turn ignition ON.• Back probe BCM connector

YB164, terminal D20, circuit 291(Orange wire) with a Voltmeterto earth.



12 volts Replace BCM,refer to 2.2 LOWSERIES BCM in


Go to Step 9.


• Back probe heated rear windowswitch connector YE54, circuit291 (Orange wire) with anVoltmeter to earth.





Go to Step 10.

10. • Turn ignition ON.• Back probe heated rear window

switch connector YB54, circuit44 (Pink/Blue wire) with aVoltmeter to earth.


12 volts Replace heatedrear window

switch.Recheck andverify repair.

Go to Step 11.




Replace fuse F13.Recheck circuit to

verify repair.

12. • Operate heated rear windowswitch.

• Can relay be heard to operate?


13. • Back probe heated rear windowrelay connector YB41, terminal30, circuit 40 (Orange wire) witha Voltmeter to earth.


12 volts Go to Step 14. Go to Step 17.

14. • Back probe heated rear windowrelay connector YB41, terminal87, circuit 192 (Violet/Red wire)with a Voltmeter to earth.

• Operate heated rear windowswitch.


12 volts Go to Step 15. Replace heatedrear window relay.


15. • Back probe heated rear windowconnector YR1, circuit 192(Violet/Red wire) with aVoltmeter to earth.

• Operate headed rear windowswitch.


12 volts Go to Step 16. Repair open incircuit 192.


16. • Back probe heated rear windowconnector YR1, circuit 185(Black wire) with an Ohmmeterto earth.


Below1 ohm

Replace or repairheated rear

window.






Replace fuse F22.Recheck andverify repair.

STEP ACTION VALUE YES NO18. • Back probe heated rear window

relay connector YB41, terminal86, circuit 44 (Pink/Blue wire)with a Voltmeter to earth.


12 volts Go to Step 19 Repair open incircuit 44.


19. • Back probe heated rear windowrelay connector YB41, terminal85, circuit 292 (Black/red wire)with a jumper lead connected toearth.

• Ignition On.• Can the relay be heard to

operate?



Replace heatedrear window relay.


4.8 POWER WINDOW SYSTEM

Figure 12J-1-102

CIRCUIT DESCRIPTION:The BCM controls the positive power supply to all window motors and the automatic down of the driver’s doorwindow (via driver’s window down relay) which is activated when the driver’s power window down button isdepressed for more than 0.4 seconds.Once activated, the automatic down feature is cancelled by pulling the driver’s power window switch upwards andreleasing it. In this case, the window will remain stationary until another activation takes place (up or down buttonactivated).With the ignition ON, power is supplied to the window system continuously. When the ignition is switched OFF andno door has been opened, power is supplied to the window system for a maximum of one hour. In the event of anydoor being opened, power is supplied to the system for 45 seconds maximum, timed from when the first door wasopened.When the doors are remotely unlocked (using the remote coded key) power is supplied to the system for 45seconds. The delay is cancelled when the doors are locked by the remote coded key.

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-17. Functional check of system.20. Checks for driver’s window down input signal at input of BCM/circuit 167.21. Checks driver’s window relay output drive signal at the BCM.22. Checks circuit 674.23. Checks circuit 440.24. Checks circuit 1240.25. Checks driver’s window relay.26. Checks circuit 673.27. Checks driver’s window motor.28. Checks circuit 167 (front and rear door power window switch assembly).29. Checks circuit 672 (front and rear door power window switch assembly).30. Uses TECH 2 to check the ignition input at the microprocessor of the BCM.31. Checks the power window relay output drive signal at the BCM.33. Checks circuit 1240.34. Checks circuit 156 (front and rear door power window switch assembly).35. Checks for ignition signal at input of BCM.36. Checks circuit 173.37. Checks circuit 440 / fuse F20.38. Checks circuit 340 / fuse F1.39. Checks driver’s window up signal at output of front and rear door power window switch assembly.40. Checks circuit 150.41. Checks driver’s power window relay / correct output drive from BCM.42. Checks driver’s window up signal at input of BCM.43. Checks front and rear door power window switch assembly (LHF window down).44. Checks circuit 667.45. Checks front and rear door power window switch assembly (LHF window down, earth).46. Checks circuit 666.47. Checks front and rear door power window switch assembly (RHR window down).48. Checks circuit 170 (RHR window system).49. Checks RHR power window switch (RHR door).50. Checks circuit 671 (RHR window system).51. Checks front and rear door power window switch assembly (RHR window down, earth).52. Checks circuit 171 (RHR window system).53. Checks RHR power window switch (RHR door).54. 54.Checks circuit 670 (RHR window system).55. Checks front and rear door power window switch assembly (LHR window down).56. Checks circuit 168 (LHR window system).57. Checks LHR power window switch (LHR door).58. Checks circuit 671 (RHR window system).59. Checks front and rear door power window switch assembly (LHR window down, earth).

60. Checks circuit 169 (LHR window system).61. Checks LHR power window switch (LHR door).62. Checks circuit 670 (LHR window system).64. Checks override switch (front and rear door power window switch assembly).65. Checks circuit 172 (RHR window system).67. Checks circuit 172 (LHR window system).68. Uses TECH 2 to check the DRIVER’S DOOR OPEN signal input at the microprocessor of the BCM.69. Checks for DRIVER’S DOOR OPEN signal at the input of the BCM.70. 70.Checks circuit 126 (driver’s door jamb switch).71. Uses TECH 2 to check PASSENGER DOOR OPEN signal input at the microprocessor of the BCM.73. Checks for PASSENGER DOOR OPEN signal at the input of the BCM.74. Checks for false output drive from the BCM or fault in wiring / relay problem, causing the window system to be

on constantly.NOTE:The following diagnostic chart assumes that the power windows are free from mechanical faults, ie. damagedwindow regulator or badly worn guide channel rubbers.

Figure 12J-1-103

POWER WINDOW SYSTEM


• Operate driver’s window downbutton for one second andrelease.

• Does the window travel all theway down automatically?


2. • Turn ignition ON.• Operate the driver’s window up

button.• Does the window travel up

when activating the button?



• Operate driver’s window downbutton for one second andrelease.

• As the window is travellingdown automatically, operate thedriver’s up button momentarilyand release.

• Does the window stop?


4. • All doors closed.• Turn ignition OFF.• Remotely lock doors.• Is power supply to window

system interrupted (greenindicator lights in front and rearpower window switchextinguished)?


5. • Remotely unlock doors.• Is power supplied to the window

system (green indicator lights infront and rear power windowswitch illuminated)?



6. • Doors closed.• Turn ignition ON.• Turn ignition OFF.• Open driver’s door.• Is power to the window system

interrupted after 45 seconds(green indicator lights in frontand rear power window switchextinguished)?


7. • Doors closed.• Turn ignition ON.• Turn ignition OFF.• Open any passenger door.• Is power to the window system

interrupted after 45 seconds(green indicator lights in frontand rear power window switchextinguished)?


8. • Turn ignition ON.• Operate LHF power window

down button (front and reardoor power window switch).

• Does LHF window travel down?


9. • Turn ignition ON.• Operate LHF power window up

button (front and rear doorpower window switch).

• Does LHF window travel up?

Go to Step 10. Replace front andrear door powerwindow switch,

refer to 2.18FRONT ANDREAR DOOR

POWERWINDOW

SWITCH, in thisSection.


• Operate RHR power windowdown button on front and reardoor power window switch.

• Does RHR window traveldown?


11. • Turn ignition ON.• Operate RHR power window up

button on front and rear doorpower window switch.

• Does RHR window travel up?



POWERWINDOW


12. • Turn ignition ON.• Operate LHR power window

down button on front and reardoor power window switch.

• Does LHR window travel down?


13. • Turn ignition ON.• Operate LHR power window up

button on front and rear doorpower window switch.

• Does LHR window travel up?



POWERWINDOW


14. • Ensure power window overrideswitch is off.

• Turn ignition ON.• Operate RHR window down

button on RHR door.• Does RHR window travel

down?


15. • Ensure power window overrideswitch is off.

• Turn ignition ON.• Operate RHR window up button

on RHR door.• Does RHR window travel up?

Go to Step 16. Replace RHRpower windowswitch, refer to

2.19 REARDOOR POWER

WINDOWSWITCHES, in

this Section.16. • Ensure power window override

switch is off.• Turn ignition ON.• Operate LHR power window

down button on LHR door.• Does LHR window travel down?


STEP ACTION VALUE YES NO17. • Ensure power window override

switch is off.• Turn ignition ON.• Operate LHR power window up

button on LHR door.• Does LHR window travel up?

System OK. Replace LHRpower windowswitch, refer to

2.19 REARDOOR POWER

WINDOWSWITCH, in this

Section.18. • Turn ignition ON.

• Are green indicator lightsilluminated in the front and reardoor power window switch?


19. • Turn ignition ON.• Operate the driver’s window

button• Does the driver’s window travel

down whilst holding the buttondown?



Go to Step 20.

20. • Back probe BCM connectorYB162, terminal C14, circuit167 (Green/Black wire) with aVoltmeter to earth.

• Turn ignition ON.• Operate the driver’s window

down button.• Is voltage as specified


21. • Back probe BCM connectorYB163, terminal B2, circuit 673(Green/Orange wire) withvoltage to earth.


down button.• Is voltage as specified?

0 volts Go to Step 22. Replace BCM,refer to 2.2 LOWSERIES BCM in


22. • Back probe driver’s windowrelay connector, YB197,terminal 1, circuit 674(Green/White wire) with aVoltmeter to earth.





23. • Back probe driver’s windowrelay connector, YB197,terminal 2, circuit 440(Orange/Violet wire) with aVoltmeter to earth.




STEP ACTION VALUE YES NO24. • Back probe driver’s window

relay connector YB197, terminal5, circuit 1240 (Orange/Yellowwire) with a Voltmeter to earth.


12 volts Go to Step 25. Repair open incircuit 1240.Recheck andverify repair.

25. • Back probe driver’s windowrelay connector YB197, terminal3, circuit 673 (Green/Orangewire) with a Voltmeter to earth.



12 volts Go to Step 26. Replace driver’swindow relay

26. • Back probe driver’s windowmotor connector, YB18, circuit673 (Green/Orange wire) with aVoltmeter to earth.

• Turn ignition ON.• Operate driver’s window down

button.• Is voltage as specified?



27. • Back probe driver’s windowmotor connector, YB18, circuit672 (Blue/White wire) with anOhmmeter to earth.


Below1 ohm

Replace driver’swindow motor,refer to Section1A5 FRONT &REAR DOORS

Go to Step 29.

28. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 8circuit 167 (Green/Black wire)with a Voltmeter to earth.





Replace front andrear door powerwindow switch,


POWERWINDOW


29. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 9circuit 672 (Blue/White wire)with an Ohmmeter to earth.


Below1 ohm



Replace front andrear door powerwindow switch,


POWERWINDOW



Module / Data Display andscroll to Ignition Switch.

• Cycle ignition switch ON andOFF.

• Does screen Ignition Switchdisplay change status form Onto Off as ignition is cycled?



YB165, terminal A3 circuit 173(Yellow wire) with a Voltmeter toearth.


0 volts Go to Step 32. Replace BCM,refer to 2.2 LOWSERIES BCM in


32. • Back probe power window relayconnector YB120, terminal 30circuit 1240 (Orange/Yellowwire) with a Voltmeter to earth.



33. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 4circuit 1240 (Orange/Yellowwire) with a Voltmeter to earth.


12 volts Go to Step 34. Repair open incircuit 1240.Recheck andverify repair

34. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 5circuit 156 (Black/Blue wire)with an Ohmmeter to earth.


Below1 ohm

Replace frontand rear doorpower windowswitch, refer to2.18 FRONTAND REAR

DOOR POWERWINDOW




35. • Back probe BCM connectorYB164, terminal D6 circuit 39(Pink/Black wire) with aVoltmeter to earth.




Check and repairfault in circuit 39(including fuseF14). Recheck

and verify repair.

36. • Back probe power window relayconnector YB120, terminal 85circuit 173 (Yellow wire) with aVoltmeter to earth.




37. • Back probe power window relayconnector YB120, terminal 86circuit 440 (Orange/Violet wire)with a Voltmeter to earth.


12 volts Go to Step 38. Check and repairfault in circuit 440

(including fuseF20). Recheck

and verify repair.

38. • Back probe power window relayconnector YB120, terminal 87circuit 340 (Orange/Green wire)with a Voltmeter to earth.


12 volts Replace powerwindow relay.

Check and repairfault in circuit 340(including fuse F1

- check forexcessive currentin circuit if fuse istripped). Recheckand verify repair.

STEP ACTION VALUE YES NO39. • Back probe front and rear door

power window switch assemblyconnector YB98, terminal 9,circuit 672 (Blue/White wire)with a Voltmeter to earth.

• Turn ignition ON.• Operate the driver’s window up

button.• Is voltage as specified?

12 volts Go to Step 40. Replace front andrear door powerwindow switch,


POWERWINDOW


40. • Back probe driver’s windowrelay connector YB193, terminal4, circuit 150 (Black wire) withan Ohmmeter to earth.


Below1 ohm



41. • Back probe BCM connectorYB163, terminal B2, circuit 674(Green/White wire) with aVoltmeter to earth.


12 volts Replace driver’swindow relay.


this Section.recheck and verify

repair

42. • Back probe BCM connectorYB162, terminal C16, circuit672 (Blue/White wire) with aVoltmeter to earth.

• Operate driver’s window upbutton.



this Section.recheck andverify repair.



43. • Back probe front and rear doorpower window switch connectorYB98, terminal 1, circuit 667(Green wire) with a Voltmeter toearth.

• Operate LHF window downbutton.

• is voltage as specified?



POWERWINDOW


44. • Back probe LHF window motorconnector YB19, circuit 667(Green wire) with a Voltmeter toearth.

• Open any passenger door.• Operate LHF window down

button.• is voltage as specified?


45. • Back probe front and rear doorpower window switch connectorYB98, terminal 13 circuit 667(Green wire) with an Ohmmeterto earth.


Below1 ohm



POWERWINDOW


STEP ACTION VALUE YES NO46. • Back probe LHF window motor

connector YB19, circuit 666(Blue wire) with an Ohmmeterto earth.


Below1 ohm

Replace LHFwindow motor,refer to Section1A5 FRONT &REAR DOORS



47. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 1circuit 170 (Blue/Yellow wire)with a Voltmeter to earth.


switch at the front and rear doorpower window switch assembly.




POWERWINDOW


48. • Back probe RHR power windowswitch assembly connectorYB37(at RHR door) terminal 3circuit 170 (Blue/Yellow wire)with a Voltmeter to earth.


switch at the front and rear doorpower window switch assembly.




49. • Back probe RHR window switchconnector YB37 (at RHR door),terminal 4, circuit 671 (Bluewire) with a Voltmeter to earth.

• Turn ignition ON.• Operate RHR power window

down button on the front andrear door power window switch


12 volts Go to Step 50. Replace RHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.

50. • Back probe RHR window motorconnector YB21, circuit 671(Blue wire) with a Voltmeter toearth.

• Turn ignition ON.• Operate RHR power window

down button on the front andrear door power window switch




51. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 7,circuit 171 (Green/Yellow wire)with an Ohmmeter to earth.


Below1 ohm



POWERWINDOW


STEP ACTION VALUE YES NO52. • Back probe RHR power window

switch connector YB37 (at RHRdoor), circuit 171 (Green/Yellowwire) with an Ohmmeter toearth.


Below1 ohm



53. • Back probe RHR power windowswitch connector YB37 (at RHRdoor), terminal 2, circuit 670(Green wire) with an Ohmmeterto earth.


Below1 ohm

Go to Step 54. Replace RHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.54. • Back probe RHR window motor

connector YB21, circuit 670(Green wire) with an Ohmmeterto earth.


Below1 ohm

Replace RHRwindow motor,

refer to 1A5FRONT & REAR

DOORASSEMBLIES.



55. • Back probe front and rear doorpower window switch assemblyconnector YB98 terminal 2,circuit 168 (Blue/Red wire) witha Voltmeter to earth.

• Turn ignition ON.• Operate LHR power window

down switch on front and reardoor power window switch.




POWERWINDOW


56. • Back probe LHR power windowswitch connector YB37 (at LHRdoor), circuit 168 (Blue/Redwire) with a Voltmeter to earth.






57. • Back probe LHR power windowswitch connector YB37 (at LHRdoor), terminal 4, circuit 671(Blue wire) with a Voltmeter toearth.




12 volts Go to Step 58. Replace LHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.

STEP ACTION VALUE YES NO58. • Back probe LHR window motor

connector YB21, circuit 671(Blue wire) with a Voltmeter toearth.

• Turn ignition ON.• Operate LHR window button on

front and rear door powerwindow switch.




59. • Back probe front and rear doorpower window switch assemblyconnector YB98, terminal 3,circuit 169 (Green/Red wire)with an Ohmmeter to earth.


Below1 ohm



POWERWINDOW


60. • Back probe LHR window switchconnector (at LHR door) YB37,circuit 169 (Green/Red wire withan Ohmmeter to earth.


Below1 ohm



61. • Back probe LHR window switchconnector (at LHR door) YB37,terminal 2, circuit 670 (Greenwire) with an Ohmmeter toearth.

• Is the value as specified?

Below1 ohm

Go to Step 62. Replace LHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.62. • Back probe LHR window motor

connector YB21, circuit 670(Green wire) with an Ohmmeterto earth.


Below1 ohm

Replace LHRwindow motor,

refer to 1A5FRONT & REAR

DOORASSEMBLIES.



63. • Turn ignition ON.• Is the green indicator light

illuminated the RHR door powerwindow switch?

Replace RHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.

Go to Step 64.

64. • Turn ignition ON.• Ensure power window override

switch is off.• Back probe front and rear door

power window switch connectorYB98, terminal 12, circuit 172(White/Black wire) with aVoltmeter to earth.




POWERWINDOW


STEP ACTION VALUE YES NO65. • Back probe RHR power window

switch connector (at RHR door)YB37, terminal 1, circuit 172(White/Black wire) with aVoltmeter to earth.


12 volts Replace RHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.



66. • Turn ignition ON.• Is the green indicator light

illuminated the LHR door powerwindow switch?

Replace LHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.

Go to Step 67.

67. • Back probe LHR power windowswitch connector (at LHR door)YB37, terminal 1, circuit 172(White/Black wire) with aVoltmeter to earth.


12 volts Replace LHRpower windowswitch, refer to

2.19 REARDOOR POWER


Section.



68. • Driver’s door closed.• Connect TECH 2 to DLC.• Select Body / Body Control

Module / Data Display andscroll to Drivers Door.

• Open driver’s door.• Does screen display Drivers

Door Open?


this Section.recheck andverify repair.

Go to Step 69.

69. • Back probe BCM connectorYB162, terminal C8, circuit 126(Grey/White wire) with aVoltmeter to earth.

• Turn ignition ON.• Driver’s door open.• Is voltage as specified?



Go to Step 70.

70. • Back probe driver’s door jambswitch connector YB1, circuit126 (Grey/White wire) and BCMconnector YB162, terminal C8,circuit 126 (Grey/White wire)with an Ohmmeter.


Below1 ohm

Replace driversdoor jamb

switch, refer2.10 DOOR

JAMBSWITCHES inthis Section.



71. • Passenger doors closed.• Connect TECH 2 to DLC.• Select Body / Body Control

Module / Data Display andscroll to Passenger Doors.

• Open and close eachpassenger door while watchingTECH 2 screen display.

• Does screen display PassengerDoor Open for every door as itis opened?



Go to Step 72.

STEP ACTION VALUE YES NO72. • In Step 71, did screen display

change from Passenger DoorsClosed to Open when a t leastone of the passenger doors wasopened?

Check andreplace faulty

door jambswitch. Recheckand verify repair.

Go to Step 73.

73. • Back probe BCM connectorYB162, terminal C7, circuit 125(White wire) with a Voltmeter toearth.

• Open any passenger door.• Is voltage as specified?




74. • Disconnect BCM connectorYB165 from BCM.

• Is the power supply to thewindow system interrupted(indicator lights in powerwindow switch turn off)?



Check for short toearth, circuit 173or short to B+,

circuit 1240and power

window relay.Recheck andverify repair.

4.9 ENGINE COOLING FAN, LOW SPEED CONTROL

Figure 12J-1-104

CIRCUIT DESCRIPTION:The two speed electric engine cooling fan’s lowspeed is enabled when the low speed enginecooling fan micro relay (located in the enginecompartment relay housing) is energised by theBCM via a request from the Powertrain ControlModule (PCM). The PCM will request low speedfan enable and disable via the serial datacommunications - main bus.When the ignition switch is turned from ON to OFFand the fan run on bit has been set by the PCM(engine coolant temperature above 117°C. TheBCM will continue to energise the low speed enginecooling fan micro relay for four minutes 15 seconds(fan run on).

TEST DESCRIPTION:The numbers below refer to step numbers in thefollowing diagnostic chart.2. Uses TECH 2 to command the BCM to turn

the low speed fan on.3. Checks for 12 volt supply to the engine cooling

fan low speed fan (coil).4. Checks for low speed fan drive signal at output

of BCM.5. Checks circuit 473 (Orange/Black wire).6. Checks circuit 1040 (Orange/Blue wire).7. Checks circuit 157 (Black/Pink wire).8. Checks engine cooling fan for low speed relay.9. Checks circuit 533 (Blue/Yellow & Black wires)

/ and engine cooling fan motor.

Figure 12J-1-105

ENGINE COOLING FAN, LOW SPEED CONTROL

STEP ACTION VALUE YES NO1. • With the engine coolant

temperature greater than 104ºC, is the low speed fanenabled?


2. • Connect TECH 2 to the DLC.• Select Body / Body Control

Module / Miscellaneous Tests /Low Fan.

• Conduct Low Speed Fan test asinstructed by TECH 2 andenable the low speed fan.

• Is the low speed fan enabled?

Go to PCM /Temperature

sensordiagnosis inSection 6C1


- V6 ENGINEor


Go to Step 3.

3. • Back probe engine cooling fanmotor connector YE119, circuit208 (Green wire) with aVoltmeter to earth.


12 volts Go to Step 4. Check and repairopen in circuit 208(including fusible

link F7).Recheck andverify repair.

4. • Back probe BCM connectorYB163, terminal B7, circuit 473(Orange/Black wire) with ajumper lead connected to earth.

• Does the low speed fan turnon?



Go to Step 5.

STEP ACTION VALUE YES NO5. • Back probe engine cooling fan

low speed relay connectorYE103, terminal 86, circuit 473(Orange/Black wire) with ajumper lead connected to earth.

• Does the low speed fan turnon?



Go to Step 6.

6. • Back probe engine cooling fanlow speed relay connectorYE103, terminal 85, circuit 1040(Orange/Blue wire) with aVoltmeter to earth.


12 volts Go to Step 7. Repair open incircuit 1040.Recheck andverify repair.

7. • Back probe engine cooling fanlow speed relay connectorYE103, terminal 87, circuit 157(Black/Pink wire) with anOhmmeter to earth.


Below1 ohm



8. • Back probe engine cooling fanlow speed relay connectorYE103, terminal 30, circuit 533(Blue/Yellow wire) with anOhmmeter to earth.





Below1 ohm

Go to Step 9. Replace enginecooling fan low

speed relay.Recheck andverify repair.

9. • Back probe engine cooling fanmotor connector YE119, circuit533 (Black wire) with anOhmmeter to earth.





12 volts Replace enginecooling fan

motor, refer toeither Section6B1 ENGINE

COOLING - V6ENGINE

orSection 6B2

ENGINECOOLING - V8

ENGINE.Recheck andverify repair.



4.10 AUTOMATIC LIGHTS OFF CONTROL

Figure 12J-1-106

CIRCUIT DESCRIPTION:The automatic lights off control feature is designedto automatically switch the headlights and parkinglights off when the driver leaves the vehicle.In the event of a system failure, the default statusof the BCM light control output is in the ON statewhen the ignition is in the ON position. This will givedirect control of the lights to the headlamp switch.The sequence of events required to switch thelights off automatically is as follows:1. The vehicle road speed input to the BCM

indicates the vehicle speed is less than 10km/h and there has not been a sudden loss ofspeed (ignition being switched off with thevehicle travelling above 10 km/h).

2. The BCM senses that the ignition switch isturned from ON to OFF and remains in theOFF position.

3. The headlamp switch has not been turned onafter the ignition switch was turned off.

4. The BCM senses the driver’s door has beenopened and turns the lights off.

When the ignition switch is turned back to the IGNposition, the lights will turn back on to the positionselected by the headlamp switch and mode ofheadlamp operation.Turning the headlamp switch off, deactivates theauto lights off system.TEST DESCRIPTION:The numbers below refer to step numbers in thefollowing diagnostic chart.1-6. Functional check of headlamp and park lamp

system.7. Tests fail safe function.8. Tests to establish whether problem is due to

no output drive from the BCM or circuitproblem beyond the BCM.

9. Checks circuit 1150.10. Uses TECH 2 to check for DRIVER’S DOOR

OPEN signal at microprocessor of BCM.11. Uses TECH 2 to for false IGNITION ON signal

at microprocessor of BCM.12. Checks for correct ignition signal level.13. Checks DRIVER’S DOOR OPEN signal at

input of BCM.14. Checks circuit 126.15. Tests for false output drive from BCM or short

circuit in lamp circuits.

Figure 12J-1-107

Figure 12J-1-108

AUTOMATIC LIGHTS OFF CONTROL

STEP ACTION VALUE YES NO1. • Turn ignition OFF.

• Turn headlamp switch fromOFF position to PARKLAMPposition.

• Are the park lamps on?


2. • Turn ignition OFF.• Turn headlamp switch from

PARKLAMP position toHEADLAMP position.

• Are the headlamps on?

Go to Step 3. Check and repairheadlamp switchassembly, fault inwiring harness toheadlamp relayand headlamp

circuits (includingfuses and

headlamp relay).Recheck andverify repair.

3. • Turn ignition ON.• Driver’s door closed.• Headlamp switch in

HEADLAMP position.• Turn ignition OFF.• Open driver’s door.• Do the headlamps turn off?


4. • After headlamps haveautomatically be turned off fromtest Step No. 3, turn the ignitionON.

• Open driver’s door.• Do headlamps turn ON?



5. • Driver’s door open.• Following on from test Step 4,

turn ignition OFF (headlampswill turn OFF).

• Turn headlamp switch from theHEADLAMP position to theOFF position.

• Turn headlamp switch from theOFF position to theHEADLAMP position.

• Do headlamps turn on?

System OK. Replace BCM,refer to 2.2 LOWSERIES BCM in


6. • Turn ignition OFF.• Turn headlamp switch to the

HEADLAMP position.• Are the headlamps on?

Check andrepair headlamp

switchassembly, fault

in wiringharness to parklamp relay andparking lamps

(including fusesand park

lamp relay).Recheck andverify repair.

Go to Step 7.


• Turn headlamp switch toHEADLAMP position.

• Are the headlamps on?



Go to Step 8.

8. • Disconnect BCM connectorYB164 and back probe terminalD14 (harness earth) circuit1150 (Black wire) with a jumperwire and connect to a soundearth point.

• Turn headlamp switch toPARKLAMP position.

• Do park lamps turn on?



Go to Step 9.

9. • Reconnect BCM connectorYB164 and back probe terminalD14 circuit 1150 (Black wire)and headlamp switch connectorYB33 circuit 1150 (Black wire)with an Ohmmeter.


Below1 ohm

Check andrepair headlamp

switchassembly, fault

in wiringharness to parklamp relay andparking lamps

(including fusesand park lamp

relay), andheadlampcircuits.


Repair open incircuit 1150.Recheck andverify repair.


Module / Data Display andscroll to Driver’s Door.

• Open driver’s door.• Does screen display Driver’s

Door Open?


11. • With TECH 2 still connectedand Data Display selected,scroll to Ignition Switch.

• Turn ignition OFF.• Does screen display Ignition

On?


12. • Turn ignition OFF.• Back probe BCM connector

YB165, terminal D6, circuit 39(Pink/Black wire) with aVoltmeter to earth.


IgnitionOFF

0 volts



Check and repairfault in wiring

(particularly shortto B+) in circuit 39

or faulty Ignition switch.Recheck andverify repair.

13. • Driver’s door open.• Back probe BCM connector

YB162, terminal C8, circuit 126(Grey/White wire) with aVoltmeter to earth.


Below0.5 volts



Go to Step 14.


YB162.• Back probe BCM connector

YB162, harness end, terminalC8, circuit 126 (Grey/Whitewire) and driver’s door jambswitch connector YB1, circuit126 (Grey/White wire) with anOhmmeter.

• Is Value as specified?

Below1 ohm

Replace driver’sdoor jamb

switch, refer2.10 DOOR

JAMBSWITCHES inthis Section.Recheck andverify repair.



15. • Turn ignition OFF.• Headlamp switch in the

HEADLAMP position.• Driver’s door open.• Disconnect BCM connector

YB164.• Do headlamps turn off?



Check and repairshort circuit inwiring to relays

and earth end oflamps, faulty

relays (beyondterminal D14).Recheck andverify repair.

4.11 WIPER CONTROL SYSTEM

Figure 12J-1-109

CIRCUIT DESCRIPTION:This system controls the front intermittent and rearwiper function. The wiper dwell on vehicles with alow series BCM has a fixed dwell period ofapproximately eight seconds and is non-adjustable.The rear wipers (on wagon models) aresynchronised to the front wipers when the frontwipers are in intermittent mode. Due to the differentwiper action between front and rear wipers, thewipers will start one quarter of a second before thefront wipers. If the option is set, the rear wiper(wagon models with automatic transmission only)has the added function of wiping continuously whenthe vehicle is in reverse gear (communicationbetween the PCM and BCM via the serial data bus)and the rear wiper/washer switch is turned on.The front and rear wipers employ a “wipe afterwash” function where, if the relevant washer pumpswitch has been pressed for more than 0.5seconds, the wipers start sweeping at a low speedcontinuously until the washer pump has beendisengaged. Following which, the wiper will be heldon for a calculated time period so that the followingnumber of sweeps can be completed:• One additional sweep if washer switch pressed

for less than 1 second.• Two additional sweeps if washer switch is

pressed for less than 1.5 seconds.• Three additional sweeps if washer switch is

pressed for more than 1.5 secondsIn order to correctly perform the number ofadditional sweeps, the wiper motor park switch ismonitored. This allows the wiper supply power tobe transferred to the park switch at the optimumtime.

Figure 12J-1-110

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-11. Functional check of wiper control system.12. Uses TECH 2 to operate front wiper (establishes whether problem is with input or output of BCM).13 Uses TECH 2 to check for INTERMITTENT WIPER/WASHER SWITCH ON signal at microprocessor of BCM.14. Checks for 12 volt supply to terminals 1 and 5 of intermittent relay.15. Checks for BCM output drive of intermittent wiper relay when commanded by TECH 2.16. Checks circuit 90.17. Checks intermittent wiper relay.18. Checks for 12 volts at wiper motor when commanded by TECH 2.19. 19.Checks circuit 152 / wiper motor.20. Checks circuit 95.21. Checks circuit 91 / wiper/washer switch.22. Checks INTERMITTENT WIPER/WASHER SWITCH ON signal at input to BCM.23. Checks circuit 97.24. Checks circuit 41 / wiper/washer switch.25. Uses TECH 2 to check for WIPER PARK SW signal at microprocessor of BCM.26. Checks if continuous wiper operation is due to faulty wiper/washer switch / continuous drive from intermittent

relay.27. Checks WIPER PARK SW signal at input to BCM.28. Checks circuit 41.29. Checks circuit 196 / wiper motor assembly (internal park switch).30 Checks for short in circuit 90, causing relay to be always driven.31. Checks intermittent wiper relay.

32. Checks FRONT WASHER SW signal at input to BCM.33 Checks circuit 94 / wiper/washer switch.34 Uses TECH 2 to operate rear wiper (establish whether problem is with input or output of BCM).35 Uses TECH 2 to check REAR WIPE SWITCH ON signal at microprocessor of BCM.36 Checks for 12 volt supply to terminal 2 and 5 of rear wiper relay.37. Checks for BCM output drive of rear wiper relay when commanded by TECH 2 at rear wiper relay.38. Checks rear wiper relay.39. Checks circuit 391.40. Checks rear wiper motor, circuit 156.41. Checks for BCM output drive of rear wiper relay at BCM when commanded by TECH 2.42. Checks REAR WIPER SW signal to BCM.43. Checks circuit 139 / wiper/washer switch.44. Checks for short in circuit 492, causing relay to be always driven.45. Checks rear wiper relay.46. Checks REAR WASHER SWITCH signal at input to BCM.47. Checks circuit 494 / wiper/washer switch.

Uses TECH 2 to check REVERSE GEAR signal at microprocessor of PCM.Uses TECH2 to check reverse gear signal on the serial data bus.

Figure 12J-1-111

WIPER CONTROL SYSTEM

STEP ACTION VALUE YES NO1. • Turn ignition to ACC.

• Turn the wiper/washer switch toINTERMITTENT position.

• Does the front wiper sweep?


2. • In Step 1, did the front wiperonly sweep once?


3. • While carrying out Step 1, timethe period between eachsweep.

• Is the delay period asspecified?

8seconds



4. • Turn ignition to ACC.• Operate the front wash switch

for 2 seconds.• Does the front wiper commence

continuous operation?


5. • In Step 4, did the front wiperscontinue for three additionalsweeps after the front washswitch was released?

Sedan - SystemOK.

Wagon - Go toStep 6.




• Turn the wiper/washer switch toREAR WIPE position.

• Does the rear wiper sweep?


7. • In Step 6, did the rear wiperonly sweep once?


8. • While carrying out Step 6, timethe period between eachsweep.

• Is the delay period asspecified?

8seconds



9. • Turn ignition to ACC.• Operate the rear wash switch

for 2 seconds.• Does the rear wiper commence

continuous operation?


10. • Turn ignition to ACC.• Turn the wiper/washer switch to

INTERMITTENT position andREAR WIPER position.

• Are the front and rear wiperssynchronised?



11. • Using TECH 2, ensue the “rearwipe continuous operation”option is active (Body / BodyControl Module / Program /Rear Wiper Control).

• Turn ignition ON.• Turn the front intermittent

wipers on.• Do the rear wipers operate

continuously when reverse gearis selected?


12. • Connect TECH to DLC.• Select Body / Body Control

Module / Miscellaneous Tests /Wiper Tests / Front Wipers.

• Turn Ignition to the ACCposition and conduct test asinstructed by TECH 2.

• Do front wipers sweepcontinuously?

Go to Step 13. Go to Step14.

13. • With TECH 2 still connected,exit Miscellaneous Tests andselect Data Display.

• Scroll to Front WiperIntermittent Switch.

• Turn ignition to the ACCposition.


• Does screen display FrontWiper Intermittent Switch On?



Go to Step 22.

STEP ACTION VALUE YES NO14. • Turn ignition to the ACC

position.• Back probe intermittent wiper

relay connector YE76, terminal5 and 1, circuit 41(Brown/Green wire) with aVoltmeter tot earth.


12 volts Go to Step 15. Check and repairopen in circuit 41(including fuse

F18 andignition switch).Recheck andverify repair.

15. • Back probe BCM connectorYB165, terminal A2, circuit 90(Brown wire) with a jumper leadconnected to earth.

• Do wipers sweep?



Go to Step 16.

16. • Back probe intermittent wiperrelay connector YE76, terminal2, circuit 90 (Brown wire) with ajumper lead connected to earth.

• Do wipers sweep?

0 volts Check andrepair open in


Go to Step 17.

17. • Back probe intermittent wiperrelay connector YE76, terminal3, circuit 95 (Green wire) with aVoltmeter to earth.

• Turn ignition to the ACCposition and conduct TECH 2Front Wiper test.


12 volts Go to Step 18. Replaceintermittentwiper relay.


18. • Back probe wiper motorconnector YE93, circuit 91(Grey/Red wire) with aVoltmeter to earth.

• Turn ignition to the ACCposition and repeat TECH 2Front Wiper test.



19. • Back probe front wiper motorconnector YE93, circuit 152(Black/White wire) with anOhmmeter to earth.


Below1 ohm

Replace frontwiper motor

assembly, referto Section 12C

INSTRUMENTS, WIPERS /

WASHERS &HORN.



20. • Back probe wiper/washerswitch connector YB52,terminal 8, circuit 95 (Greenwire) with a Voltmeter to earth.



12 volts Go to Step 21. Check and repairopen in circuit 95.


STEP ACTION VALUE YES NO21. • Back probe wiper/washer

switch connector YB52,terminal 5, circuit 91 (Grey/Redwire) with a Voltmeter to earth.





Replacewiper/washer

switch, refer toSection 12C

INSTRUMENTS,WIPERS /

WASHERS &HORN.

22. • Turn ignition to ACC.• Back probe BCM connector

YB164, terminal D10, circuit 97(Blue/White wire) with aVoltmeter to earth.





Go to Step 23.

23. • Turn ignition to ACC.• Back probe wiper/washer

switch connector YB52,terminal 9, circuit 97(Blue/White wire) with aVoltmeter to earth.





Go to Step 24.


switch connector YB52,terminal 4, circuit 41(Brown/White wire) with aVoltmeter to earth.


12 volts Replacewiper/washer



WASHERS &HORN.





Module / Data Display andscroll to Wiper Park Switch.


• Does screen display WiperPark Switch On when wiper isin the park position and WiperPark Switch Off when wiper isoperating?



INTERMITTENT position.• Remove intermittent wiper

relay.• Do wipers operate

continuously?

Replacewiper/washer



WASHERS &HORN.

Go to Step 30.



• Back probe BCM connectorYB163, terminal B9, circuit 196(Yellow wire) with a Voltmeter toearth.


12 voltswhile

operating

0 voltsin park



Go to Step 28.

28. • Turn ignition to ACC.• Back probe wiper motor

connector YE93, circuit 41(Brown/White wire) with aVoltmeter to earth.





INTERMITTENT position.• Back probe wiper motor

connector YE93, circuit 196(Yellow wire) with a Voltmeter toearth.

• Are values as specified?

12 voltswhile

operating

0 voltsin park



Replace frontwiper motor, refer

to Section 12CINSTRUMENTS,

WIPERS /WASHERS &

HORN.

30. • Turn ignition to ACC.• Remove intermittent relay.• Disconnect BCM connector

YB165.• Back probe intermittent wiper

relay connector YE76, circuit 90(Brown wire) with an Ohmmeterto earth.


Below1 ohm


earth incircuit 90.


Go to Step 31


• Swap intermittent wiper relaywith a known good relay.

• Turn ignition to ACC.• Turn the wiper/washer switch to

INTERMITTENT position.• Does only one sweep occur?

Replaceintermittentwiper relay.





YB164, terminal D18, circuit 94(Light Blue wire) with aVoltmeter to earth.

• Operate front wash switch.• Is voltage as specified?



Go to Step 33.


switch connector YB52,terminal 3, circuit 94 (L Bluewire) with a Voltmeter to earth.

• Operate front wash switch.• Is voltage as specified?

12 volts check and repairopen in circuit94. Recheck

and verify repair.

Replacewiper/washer



WASHERS &HORN.


• Select Body / Body ControlModule / Miscellaneous Tests /Wiper Tests / Rear Wiper.

• Turn ignition to the ACCposition and conduct test asinstructed by TECH 2.

• Does rear wiper operatecontinuously?


35. • Turn ignition to ACC.• With TECH 2 still connected,

exit Miscellaneous Tests andselect Data Display.

• Scroll to Rear Wiper Switch.• Turn wiper/washer switch to

REAR WIPE position.• Does screen display Rear

Wiper Switch On?



Go to Step 42.

36. • Turn ignition to ACC.• Back probe rear wiper relay

connector YB36, terminals 2and 5, circuit 41 (Brown/Greenwire) with a Voltmeter to earth.




37. • Back probe rear wiper relayconnector YB36, terminal 1,circuit 492 (Grey/Blue wire) witha jumper lead connected toearth.

• Does rear wiper operate?


38. • Back probe rear wiper relayconnector YB36, terminal 3,circuit 391 (Green/Yellow wire)with a Voltmeter to earth.

• Connect a jumper lead betweenwiper relay connector, terminal1 and earth.



12 volts Go to Step 39. Replace rearwiper relay.


39. • Back probe rear wiper motorconnector YR21, circuit 391(Green/Yellow wire) with aVoltmeter to earth

• Connect a jumper lead betweenwiper relay connector, terminal1 and earth.



12 volts Go to Step 40. Check and repairopen in


40. • Back probe rear wiper motorearth connection with anOhmmeter to earth.


Below1 ohm

Replace rearwiper motor,refer Section12C INST,WIPERS/

WASHERS &HORN.

Check and repairrear wiper motorearth connection.



YB165, terminal A4, circuit 492(Grey/Blue wire) with a jumperlead connected to earth.


• Does the rear wiper operate?



Check and repaircircuit 492 asnecessary.



YB164, terminal D7, circuit 139(Grey/Red wire) with aVoltmeter to earth.

• Turn wiper/washer switch toREAR WIPE position.




Go to Step 43.

43. • Turn ignition to ACC.• Back probe wiper washer

switch connector YB52,terminal 1, circuit 1391(Grey/Red wire) with aVoltmeter to earth.

• Turn wiper/washer switch toREAR WIPE position.


12 volts Check andrepair open incircuit 1391.Recheck andverify repair.

Replacewiper/washer


INST., WIPERS /WASHERS &

HORN

44. • Remove rear wiper relay.• Disconnect BCM connector

YB165.• Back probe rear relay connector

YB36, terminal 1, circuit 492(Grey/Blue wire) with anOhmmeter to earth.


Below1 ohm


earth incircuit 492.


Go to Step 45.


• Replace rear wiper relay with aknown good relay.

• Turn ignition to ACC.• Turn wiper/washer switch to

REAR WIPE position.• Does only one rear wipe sweep

occur?

Replace rearwiper relay.


Go to Step 49.


YB164, terminal D19, circuit494 (White/Blue wire) with aVoltmeter to earth.

• Operate rear wash switch.• Is voltage as specified?



Go to Step 47


• Back probe wiper/washerswitch connector YB52,terminal 7, circuit 494(White/Blue wire) with aVoltmeter to earth.

• Operate rear washer switch.• Is voltage as specified?

12 volts Check andrepair open incircuit 494,.


Replacewiper/washer


INST., WIPERS /WASHERS &

HORN.

48. • Connect TECH 2 to DLC.• Turn ignition to ACC.• Vehicle in reverse gear.• Select ENGINE / NORMAL

MODE.• Scroll to COMMANDED GEAR

display.• Does screen display R?





V6 ENGINEor


MANAGEMENT -V8 ENGINE.

49. • Connect TECH 2 to DLC.• Turn ignition to ACC.• Vehicle in neutral gear.• Select ENGINE / NORMAL

MODE.• Scroll to COMMANDED GEAR

display.• Does screen display R?



- V6 ENGINEor




4.12 DOME LAMP DELAY CONTROL

Figure 12J-1-112

CIRCUIT DESCRIPTION:The interior lighting is controlled by the BCM, or thedome lamp switch (incorporated in the overheaddome lamp and switch assembly). The interiorlighting is activated when any door is opened, thedoors are unlocked with the remote coded key orwhen the dome lamp switch is operated.The interior lighting operates continuously whilstany door is open. After all doors have been closed,the lamp will remain activated for an additional 30seconds.If the interior lighting has been activated by a BCMcontrol system action, the dome lamp switch willturn the interior lighting off when it is switched fromthe DOOR to the OFF position. This means thatthe switch can curtail any delay time indicated aswell as switch the lighting off whilst a door is open.With the dome lamp switch in the ON position,BCM control of the interior lighting is overridden.The interior lighting is switched on upon centraldoor unlocking for 30 seconds. If the ignition isturned on during this period, the interior lighting willbe switched off immediately. Interior lighting is alsoswitched off upon central door locking, except if thedome lamp switch is turned on.

TEST DESCRIPTION:The numbers below refer to step numbers in thefollowing diagnostic chart.1-6. Functional check of dome lamp system.7. Checks dome lamp globe.8. Checks circuit 1140/fuse F6.9. Checks circuit 156 and dome lamp and switch

assembly.10. Checks dome lamp drive output at BCM.11. Checks circuit 174 and dome lamp and switch

assembly.12. Uses TECH 2 to check for passenger door

signal at microprocessor of BCM.13. Checks BCM for false output drive, circuit 174

and dome lamp and switch assembly.14. Checks passenger door jamb circuit and

switches.15. Checks driver’s door jamb switch signal at

input of BCM.16. Checks circuit 126.17 & 18. Checks passenger door jamb switch

signal at input of BCM.19. Checks ignition signal at input of BCM.

Figure 12J-1-113

Figure 12J-1-114

DOME LAMP DELAY CONTROL

STEP ACTION VALUE YES NO1. • Switch the dome lamp switch to

the ON position.• Does the dome lamp

illuminate?


2. • Dome lamp switch in DOORposition.

• All doors locked.• Unlock doors with remote key.• Does dome lamp turn on?



• Dome lamp on (doors open).• Close doors and lock with

remote key.• Does dome lamp turn off

immediately?



• Doors closed but unlocked(dome lamp off).

• Open driver’s door.• Does dome lamp illuminate



• Doors closed but unlocked(dome lamp off).

• Open any passenger door.• Does dome lamp illuminate?



• With doors closed, lock thenunlock doors with remote key.

• Within 30 seconds, turn ignitionto the ON position.

• Does the dome lamp turn offimmediately?


7. • Check dome lamp globe.• Is globe OK?

Go to Step 8. Replace globe.Recheck andverify repair.

8. • Back probe dome lamp andswitch assembly connectorYB6, circuit 1140 (Orange/Blackwire) with a Voltmeter to earth.


12 volts Go to Step 9. Check and repairfault in

circuit 1140(includingfuse F6).


9. • Back probe dome lamp andswitch assembly connectorYB6, circuit 156 (Black/Bluewire) with an Ohmmeter toearth.


Below1 ohm

Replace domelamp and switchassembly, refer12B LIGHTING

SYSTEM.Recheck andverify repair.



STEP ACTION VALUE YES NO10. • Turn ignition OFF.

• Back probe BCM connectorYB162, terminal C24, circuit174 (White/Green wire) with anOhmmeter to earth.

• With doors closed, lock andunlock doors using remote key.

• Within 30 seconds of unlockingdoors, is reading as specified?

Below1 ohm

Go to Step 11 Replace BCM,refer to 2.2 LOWSERIES BCM in


11. • Back probe BCM connectorYB162, terminal C24, circuit174 (White/Green wire) anddome lamp and switchassembly connector YB6, circuit174 (White/Green wire) with anOhmmeter.


Below1 ohm

Replace domelamp and switchassembly, refer12B LIGHTING

SYSTEM.Recheck andverify repair.



12. • Passenger doors closed.• Connect TECH 2 to DLC.• Select Body / Body Control

Module / Data Display andscroll to Passenger Doors.

• Does the screen displayPassengers Doors Closed?




• Does dome lamp turn off?



Check and repaireither short incircuit 174 or

faulty dome lampand switchassembly.


14. • TECH 2 still connected andData Display selected, scroll toPassenger Doors.


• Does screen display PassengerDoors Closed?

Check andrepair either

short in circuit125 or faulty

passenger doorjamb switchassembly.




15. • Driver’s door open.• Back probe BCM connector

YB162, terminal C8, circuit 126(Grey/White wire) with aVoltmeter to earth.


Below0.5 volts



Go to Step 16.

16. • Back probe BCM connectorYB162, terminal C8, circuit 126(Grey/White wire) and driver’sdoor jamb switch connectorYB1, circuit 126 (Grey/Whitewire) with an Ohmmeter.

• Is reading as specified.

Below1 ohm

Replace driver’sdoor jamb

switch, refer to2.10 DOOR

JAMBSWITCHES inthis Section.Recheck andverify repair.




YB162, terminal C7, circuit 125(White wire) with a Voltmeter toearth.

• Open and close eachpassenger door.

• Is voltage as specified whenopening each of the passengerdoors?

Below0.5 volts



Go to Step 18.

18. • While performing test in Step17, was voltage as specified atleast one of the passengerdoors?

Check andrepair either

open in relevantpassenger doorjamb circuit orfault door jamb

switch.



19. • Back probe BCM connectorYB164 terminal D6, circuit 39(Pink/Black wire) with aVoltmeter to earth.




Repair open incircuit 39

(including fuse F4and

ignition switch).Recheck andverify repair.

4.13 AIR CONDITIONING INTERFACE

Figure 12J-1-115

CIRCUIT DESCRIPTION:The air-conditioning interface is used to turn the airconditioning system on and off. The BCM reads themomentary air conditioning switch signal, monitorsfan speed and if the ignition is on the BCM requeststhe PCM to turn on the air conditioning compressor.The air conditioning status LED is turned on by theBCM when the air conditioning system is active (ifthe ignition is turned on) and will toggle with the airconditioning select switch. The status will beremembered when the ignition is switched from ONto OFF or when the blower is off but will reset to offwhen the battery is disconnected. If the blower is offand the air conditioning select button is pressed,then the next time the blower is switched on, the airconditioning status will also come on. Turning theignition off will cancel this button press function.

Figure 12J-1-116

The blower fan is controlled by the blower fan inhibit relay, which suspends blower fan operation duringcranking (via the accessories feed to this control relay). The BCM blower inhibit relay control output will onlyallow operation with the ignition in the ON position and therefore, inhibit the operation of this relay while theignition switch is in the ACC position.

NOTE:The BCM has provision for an air conditioning thermostat to prevent the evaporator from icing up. In theabsence of this thermostat, the input is connected to ignition.

TEST DESCRIPTION:The numbers below refer to step numbers in the following diagnostic chart.1-5. Functional check of air conditioning system.6. Checks blower inhibit relay output switch.7. Checks circuit 251.8. Checks heater and air conditioning control switch.9. Checks battery positive feed to blower motor.10. By-passes the resistor assembly (blower motor) to determine problem with blower motor assembly.11. Checks blower inhibit relay output from BCM.12. Checks battery positive at blower inhibit relay.13. Checks circuit 401.14. Checks circuit 150 including blower inhibit relay.15. Uses TECH 2 to check IGNITION ON signal at microprocessor of BCM.16. Checks ignition ON signal at input of BCM.17. Checks blower motor circuit 51.18. Uses TECH 2 to conduct air conditioning compressor/air conditioning status LED test.19. Uses TECH 2 to check air conditioning select ON/OFF signal at microprocessor of BCM.20. Uses TECH 2 to check BLOWER FAN ON signal at microprocessor of BCM.21. Test to determine if air conditioning status LED is not illuminated due to BCM or other circuits.22. Checks for battery positive supply to air conditioning master switch assembly.23. Checks circuit 962 and air conditioning master switch assembly.24. Checks AIR CONDITIONING SELECT signal at input to BCM.25. Checks circuit 248 and air conditioning master switch assembly.26. Checks BLOWER FAN ON signal at input to BCM.27. Checks if TECH 2 is able to communicate to driver’s via the serial data bus.28. Checks AIR CONDITIONING THERMOSTAT ON signal at input to BCM.29. Uses TECH 2 to command the PCM to switch the air conditioning compressor on.30. Checks blower relay drive signal.31. Checks battery positive feed to blower relay.32. Checks blower relay switch output.33. Checks circuit 52 and heater and air conditioning control switch34. Checks circuit 150 and blower relay.

Figure 12J-1-117

AIR CONDITIONING INTERFACE


• Heater and air conditioningcontrol switch speed 1.

• Does blower motor operate?


2. • Turn ignition ON.• Heater and air conditioning

control switch speed 1.• Toggle air conditioning select

switch.• Does air conditioning status

LED illuminate?




switch to ON.• Does air conditioning

compressor operate?



control switch speed 4.• Does blower motor operate?




switch to ON.• Does air conditioning

compressor operate?

System OK. Check blowermotor resistor

assembly,refer to 2 AIR

CONDITIONING.

6. • Turn ignition ON.• Back probe blower inhibit relay

connector YB48, terminal 87,circuit 251 (Orange/Green wire)with a Voltmeter to earth.


100mVolts


7. • Back probe heater and airconditioning control switchconnector YB50, circuit 251(Orange/Green wire) with aVoltmeter to earth.


100mVolts


Recheck circuit toverify repair.

STEP ACTION VALUE YES NO8. • Back probe heater and air

conditioning control switchconnector YB50, circuit 359(Dark Green/Yellow wire) withan Voltmeter to earth.


100mVolts

Go to Step 9. Replace heaterand air

conditioningcontrol switch,refer to 2 AIR

CONDITIONING.

9. • Back probe blower motorconnector YB14, circuit 2 (Redwire) with a Voltmeter to earth.


12 Volts Go to Step 10. Check and repairfault in circuit 2

(including fusiblelink FY).


10. • Disconnect blower motorresister connector YB2.

• Back probe blower resistorconnector YB2 (harness end)circuit 51 (Yellow wire) with ajumper lead and connect toearth.

• Does the blower motoroperate?

Check blowermotor resistor.

Go to Step 17.


YB163, terminal B1, circuit 401(Green wire) with a jumper leadconnected to earth.

• Does the blower motoroperate?


12. • Turn ignition ON.• Back probe blower inhibit relay

connector YB48, terminal 86,circuit 4 (Brown wire) with aVoltmeter to earth.


12 Volts Go to Step 13. Check and repairfault in circuit 4.Recheck andverify repair

13. • Back probe blower inhibit relayconnector YB48, terminal 85,circuit 401 (Green wire) with ajumper lead connected to earth.

• Turn ignition ON.• Does the blower motor

operate?

Check andrepair fault incircuit 401.


Go to Step 14.

14. • Back probe blower inhibit relayconnector YB48, terminal 30,circuit 150 (Black wire) with anOhmmeter to earth.


Below1 ohm

Replace blowerinhibit relay.




15. • Connect TECH2 to DLC.• Select Body / Body Control

Module / Data Display andscroll to Ignition Switch.

• With ignition on, does screendisplay Ignition On?



Go to Step 16.


• Back probe BCM connectorYB164, terminal D6, circuit 39(Pink/Black wire) with aVoltmeter to earth.


IGN ON,12 Volts

IGNOFF

0 Volts



Check and repairfault in circuit 39



17. • Back probe blower motorconnector YB14, circuit 51(Yellow wire) with a jumper leadand connect to earth.

• Does blower motor operate?



Replace blowermotor, refer to

2 AIRCONDITIONING.


Module / Miscellaneous Tests /Lamps / A/C Test.

• Conduct test as instructed byTECH 2 and switch the A/Ccompressor status LED on.

• Does Air conditioning statusLED illuminate?


19. • With TECH 2 connected, exitMiscellaneous Test and selectData Display.

• Scroll to A/C Switch.• Does screen display AC Switch

On / Off when toggling airconditioning select switch?


20. • With TECH 2 connected andData Display selected, scroll toA/C Blower Switch.

• Switch heater and airconditioning control switch tospeed 1.

• Does screen display A/C BlowerSwitch On?



Go to Step 26.


YB163, terminal B8, circuit 962(Red/Brown wire) with a jumperlead and connect to earth.

• Does air conditioning statusLED illuminate?



Go to Step 22.

22. • Back probe air conditioningmaster switch connector YB54,circuit 44 (Pink/Blue wire) with aVoltmeter to earth.


12 Volts Go to Step 23. Check and repairfault in circuit 44




• Back probe air conditioningmaster switch connector YB54,circuit 962 (Red/Brown wire)with a jumper lead andconnector to earth.

• Does air conditioning statusLED illuminate?



Replace heaterand air


CONDITIONING.


YB164, terminal D9, circuit 248(Red wire) with a Voltmeter toearth.

• Is voltage as specified whenactivation air conditioningswitch?

Switchclosed

(held in)12 VoltsSwitchopen(rest

position)0 volts



Go to Step 25.

25. • Turn ignition ON.• Back probe air conditioning

master switch connector YB54,circuit 248 (Red/White wire)with a Voltmeter to earth.

• Is voltage as specified whenactivation air conditioningswitch?

Switchclosed

(held in)12 VoltsSwitchopen(rest

position)0 volts





CONDITIONING.


YB163, terminal B3, circuit 359(Dark Green/Yellow wire) with aVoltmeter to earth.


100mVolts



Check and repairopen in circuit

359. Recheck andverify repair.


Module.• Does TECH 2 display system

identification information (BCMtype)?

Go to Step 28 Go to serial datacommunications

diagnosis, refer to4.1 SERIAL DATA

COM. in thisSection.


YB164, terminal D4, circuit 53(Green wire) with a Voltmeter toearth.


Go to Step 29. Check and repairopen in circuit 53



29. • With TECH 2 connected, exitBody and select Engine /appropriate engine / DataDisplay / Miscellaneous Testsand command AC CompressorOn.

• Does air conditioningcompressor operate?



Go to PCMdiagnosis, inSections 6C1


V6 ENGINEor


MANAGEMENT -V8 ENGINE.

12 Volts


• Switch heater and airconditioning control switch tospeed 4.

• Back probe blower relayconnector YB64, terminal 85,circuit 52 (Yellow/Black wire)with a Voltmeter to earth.


100mVolts


31. • Turn ignition ON.• Back probe blower relay

connector YB64, terminal 86,circuit 44 (Pink/Blue wire) with aVoltmeter to earth.


12 Volts Go to Step 32. Check and repairopen in circuit 44.


32. • Turn ignition ON.• Switch heater and air

conditioning control switch tospeed 4.

• Back probe blower relayconnector YB64, terminal 87,circuit 51 (Yellow wire) with aVoltmeter to earth


100mVolts


circuit 51.Recheck andverify repair

Go to Step 34.

33. • Turn ignition ON.• Switch heater and air

conditioning control switch tospeed 4.

• Back probe heater and airconditioning control switchconnector YB50, circuit 52(Yellow/Black wire) with aVoltmeter to earth.


100mVolts





CONDITIONING.

34. • Back probe blower relayconnector YB64, terminal 30,circuit 150 (Black wire) with aVoltmeter to earth.


100mVolts

Replace blowerrelay.




4.14 CRUISE CONTROL INTERFACE

Figure 12J-1-118

CIRCUIT DESCRIPTION:The cruise control module is powered up by theaction of the cruise control ON/OFF switch. It thenactivates an input of the BCM which in turn sends aserial data message, via the auxiliary serial dataline to the instrument cluster to turn the CRUISElamp ON. The ignition must be ON for the BCM tocommunicate with the instrument cluster.

TEST DESCRIPTION:The numbers below refer to step numbers in thefollowing diagnostic chart.5. Uses TECH 2 to command the CRUISE lamp

in the instrument cluster on.6. Checks for the ‘ignition’ signal at the input of

the BCM.7. Checks for the ‘cruise on’ signal at the input of

the BCM.8. Checks for the ‘cruise on’ signal at the output

of the cruise control module.

Figure 12J-1-119

CRUISE CONTROL INTERFACE


• Press the cruise controlON/OFF switch.

• Does the cruise controlCRUISE lamp change state?


2. • Connect TECH 2 to the DLC.• Turn ignition ON.• Select Diagnostics.• Select: Model Year.• Select: VT Commodore.• Does the SYSTEM

SELECTION menu appear onTECH 2 screen?

Go to Step 3. Go to serial datacommunications



3. • With TECH 2 still connectedand ignition on, select Body /Body Control Module / DataDisplay.

• Scroll to Ignition Switch.• Does screen display Ignition

Switch On?


4. • With TECH 2 connected andData Display selected, scroll toCruise Control Input Signal.

• Press the cruise controlON/OFF button.

• Does the screen change fromCruise Control Input Signal Offto On as the switch is pressed?


STEP ACTION VALUE YES NO5. • With TECH 2 still connected,

exit Body, select Instruments /Miscellaneous Tests / Lampsand command the CRUISElamp on.

• Does the CRUISE lamp in theinstrument cluster illuminate?



Go to Instrumentsdiagnosis inSection 12C


WASHERS &HORN



TurnignitionON.,

approx.12 volts

TurnignitionOFF.

0 volts



Repair open orshort in circuit 39(including fuse

F14 and switch).Recheck circuit to

verify repair.


YB164, terminal D8, circuit 83(Grey wire) with a Voltmeter toearth.

• Press cruise control ON/OFFswitch.

• Does the voltage toggle from12V - 0V - 12V?



Go to Step 8.

8. • Turn ignition ON.• Back probe cruise control

connector YE56, terminal H,circuit 83 (Grey wire) with aVoltmeter to earth.

• Press cruise control ON/OFFswitch.

• Does the voltage toggle from12V - 0V - 12V?

Repair open orshort in

circuit 83.Recheck circuitto verify repair.

Go to Cruisecontrol diagnosisin Section 12E

CRUISECONTROL.

4.15 SRS DEPLOYMENT VEHICLE SHUTDOWN

Figure 12J-1-120

CIRCUIT DESCRIPTION:In the event of SRS (Supplemental Restraint System) deployment, the Sensing Diagnostic Module (SDM) sets aflag and sends serial data via the SRS Serial Data (SDI) bus to the BCM. Within the BCM, the SRS SDI bus islinked to the auxiliary serial data via a wire link. The SDM advises various vehicle systems via the auxiliary bus totake appropriate shutdown action.The BCM will monitor this serial data and perform the following actions once the appropriate data is identified andthe vehicle speed is zero for 10 seconds:1. Turn the dome lamp ON continuously.2. Unlock all doors.The dome lamp will be switched OFF when the ignition switch is cycled from OFF to ON, or when the BCM is reset(ie. via battery disconnection)

TEST DESCRIPTION:The numbers below refer to step numbers in thediagnostic chart below.1. Checks the Main SDI bus communication.2 & 3. Checks Auxiliary SDI bus communication to

the SDM and instruments.4. Checks the BCM internal link, SRS SDI bus

connection to the SDI auxiliary bus.5. Checks circuit 1220 (Green/White wire) (BCM

to SDM).NOTE:This diagnostic chart assumes that the central doorlocking system, dome lamp and indicator functions(controlled by the BCM) are operating correctly.

Figure 12J-1-121

SRS DEPLOYMENT VEHICLE SHUTDOWN


1. • Connect TECH 2 to theDLC.

• Select Body / BodyControl Module.

• Turn ignition ON (asrequested by TECH 2).

• Does screen displayBCM systemidentification?




2. • With TECH 2 stillconnected, exit BodyControl Module selection.

• Select Body / SRS.


• After five seconds, isTECH 2 able tocommunicate with theSDM?

Go to SRSdiagnosis inSection 12M.

Go to Step 3.

3. • With TECH 2 stillconnected, exit SRSselection.

• Select Body /Instruments.


• After five seconds, isTECH 2 able tocommunicate with theinstruments?






• Back probe BCMconnector YB164,terminal D13, circuit 1220(Green/White wire) andBCM connector YB164,terminal D3, circuit 1220(Green/White wire) withan Ohmmeter.


Below1 ohm




• Back probe BCMconnector YB164,terminal D13, circuit 1220(Green/White wire) andSDM connector YB190,terminal 9, circuit 1220(Green/white wire) withan Ohmmeter.


Below1 ohm

Go to SRSdiagnosis inSection 12M,

SRS.


Recheck circuit toverify repair.

5. SPECIAL TOOLS

TOOL NO. REF IN TEXT TOOL DESCRIPTION COMMENTS

AU455 CONNECTOR BODY REMOVER MANDATORY TOOL USED TOREMOVE THE DOOR WIRING

HARNESS CONNECTORFROM THE A AND B PILLARS

J39200 DIGITAL MULTIMETER TOOL NO. J39200PREVIOUSLY RELEASED, OR

USE COMMERCIALLYAVAILABLE EQUIVALENT.MUST HAVE 10 MEG OHM

INPUT IMPEDANCE

KM-609 CONNECTOR TEST ADAPTOR KIT PREVIOUSLY RELEASEDFOR V CAR. USED IN

CONJUNCTION WITH AMULTIMETER FOR

MEASURING VOLTAGES ANDRESISTANCES WITHOUT

DAMAGING WIRINGHARNESS CONNECTORS

TECH 2 DIAGNOSTIC SCAN TOOL MANDATORY TOOL USEDFOR DIAGNOSIS OF VEHICLE

ELECTRICAL SYSTEMS

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