ssp 286 new data bus systems (2)

7/31/2019 SSP 286 New Data Bus Systems (2)

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Attenuation in optical bus

Assessment of the optical fibre condition

involves measuring the attenuation.

A reduction in the power of the light wavesduring transmission is referred to asattenuation.

Attenuation (A) is given in decibels (dB).

A decibel is not an absolute quantity, but ratherrepresents a ratio of two values.This also explains why the decibel is not definedfor specific physical quantities.The decibel is also used, for example as a unitfor expressing sound pressure or volume.

For attenuation measurement, this quantity iscalculated from the logarithm of the ratio oftransmission power to reception power.

Formula:

Attenuation ratio (A) = 10 * lg

Example:

10 * lg = 3 dB

This means that the light signal is reduced byhalf for an optical fibre with an attenuation ratioof 3 dB.

In other words, the higher the attenuation ratio,

the poorer the signal transmission.

If several components are involved in thetransmission of light signals, the attenuationratios of the components can be added up toform a total attenuation ratio in the same way asthe resistances of electrical componentsconnected in series.

20 W

10 W

Plug connection, e.g. 0.5 dB

Optical fibre, e.g. 0.6 dB

Plug connection, e.g. 0.3 dB

Totalattenuation ratio = 1.4 dB(in this example)

SSP286_045

Transmission power

Reception power

As in the MOST bus each control unitre-transmits the light waves, only the totalattenuation ratio between two controlunits is of significance.


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Causes of increased attenuation in the optical

data bus

1. Optical fibre bending radius too smallBending the optical fibre to a radius ofless than 5 mm (kinking) obscures thecore (comparable with bent perspex) atthe bending point.The optical fibre has to be replaced.

2. Damage to optical fibre cladding.

3. End face scratched.

4. End face dirty.

5. End faces offset(connector housing broken).

6. End faces not in line(angle error).

7. Gap between end face of optical fibreand contact surface of control unit(connector housing broken or notengaged).

8. Ferrule not properly crimped.

MOST bus

SSP286_069


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Avoid contaminating end face, e.g. with

fluids, dust or other media; prescribedprotective caps are only to be removed forconnection or test purposes employingextreme care

Avoid loops and knots when laying invehicle; pay attention to correct lengthwhen replacing optical fibre

Rules for handling optical fibres and their

components

Never employ thermal working and repair

methods such as soldering, hot bondingor welding

Never employ chemical and mechanicalmethods such as bonding and jointing

Never twist together two optical fibrecables or an optical fibre cable and acopper wire

Avoid cladding damage such as

perforation, cutting or crushing: Do notstand or place objects on cladding, etc.when fitting in vehicle

Optical fibre anti-kink sleeve

Fitting an anti-kink sleeve guarantees aminimum optical fibre radius of 25 mm.

SSP286_087


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MOST bus

This completes the ring.

MOST bus system diagnosis is implementedby way of the data bus diagnosis interfaceand the diagnosis CAN.

A distinguishing feature of the MOST bussystem is its ring configuration.

The control units transmit data in onedirection via an optical fibre to the nextcontrol unit in the ring.

This process continues until the data returnto the control unit which originallytransmitted them.

SSP286_047

Ring configuration of MOST bus

Navigation Amplifier

TV tuner

Map reader

Diagnosis interfacefor data bus J533

(gateway)

Control unit for frontinformation display

and operating unit

Telematics

Diagnosticconnection

Operating unit

Display

CD changer

Radiotuner

Voicecontrol


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Functions of system manager:

Control of system statuses Transmission of MOST bus messages Management of transmission capacities

System manager

Together with the diagnosis manager, thesystem manager is responsible for systemadministration in the MOST bus.

The diagnosis interface for data bus J533(gateway) assumes the diagnosis managerfunctions in the Audi A8 03 (refer to Page 41).

The control unit for front information displayand operating unit J523 implements thesystem manager functions.

MOST bus

system statuses

Sleep mode

There is no data exchange in the MOST bus.The units are switched to standby and canonly be activated by an optical start pulsefrom the system manager.

The closed-circuit current is reduced to aminimum.

Sleep mode activation conditions:

All control units in MOST bussystem indicate readiness to switchto sleep mode.

No requests from other bus

systems via the gateway.

Diagnosis not active.

At a higher ranking level, the MOST bussystem can be switched to sleep mode

by the battery manager via the gateway inthe event of starter battery discharge

by activation of transport mode via thediagnosis tester

SSP286_066


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Standby mode

No functions are available to the user, i.e. thesystem gives the impression of being switchedoff. The MOST bus system is active in thebackground, however all output media (display,radio amplifier etc.) are either inactive ormuted.

This mode is active on starting andduring system run-on.

Activation of standby mode

Activation by other data buses

via gateway, e.g. unlocking/opening of driver's door, ignition ON

Activation by control unit in MOST bus,e.g. incoming call (telephone)

Power ON

The control units are fully activated. Data areexchanged on the MOST bus. All functions areavailable to the user.

Prerequisites for Power ON mode:

MOST bus system in standby mode

Activation by other data buses viagateway e.g. S-contact,

display active

Activation by user functionselection, e.g. via multimediaoperating unit E380

Further information on system statusactivation can be found in the SelfStudy Programmes for the appropriatevehicle models.

SSP286_067

MOST bus

SSP286_068


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The asynchronous data are entered and thustransmitted to the receiver in packets of4 bytes (quadlets) on the basis of thetransmitter/receiver addresses (identifier) andthe available asynchronous volume.

The corresponding data transfer processesare described in more detail on Page 38

onwards.

Frame areas

The preamble marks the start of a frame.Each frame in a block has a separatepreamble.

A delimiter creates a clear distinctionbetween the preamble and the subsequentdata fields.

The data field is used by the MOST bus totransmit up to 60 bytes of user data to thecontrol units.

A distinction is made between two types ofdata:

Audio and video in the form of

synchronous data Images, information for calculationpurposes and messages in the form ofasynchronous data

The data field has a flexible structure. Theproportion of synchronous data in the datafield is between 24 and 60 bytes. Thetransmission of synchronous data haspriority.

MOST bus

SSP286_039

SSP286_040

SSP286_041

Asynchronous data

0 - 36 bytes

Synchronous data24 - 60 bytes


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The two check bytes are used to transmitinformation such as

Transmitter and receiver address(identifier)

Control commands to receiver(e.g. amplifier setting up/down)

The block check bytes are assembled in thecontrol units to form a check frame. One blockconsists of 16 frames. The check framecontains control and diagnosis data to betransferred from a transmitter to a receiver.This is referred to as address-oriented datatransfer.

Example:

Transmitter Control unit for frontinformation display andoperating unit

Receiver Amplifier

Control signal up/down

The status field of a frame contains frame

transmission information for thereceiver.

The parity field is used for a final check thatthe frame is complete. The content of thisfield governs whether a transmission processis repeated.

SSP286_042

SSP286_043

SSP286_044

Check bytes/frame 1

SSP286_038

Check bytes/frame 2


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This process continues right through to thesystem manager. In the incoming slave light

the manager recognises the prompt forsystem starting.

The system manager then transmits anotherspecially modulated light master light tothe next control unit. This master light isrelayed by all control units. Reception of themaster light in its FOT informs the systemmanager that the ring is complete and frametransmission commences.

System start (wake-up)

If the MOST bus is in sleep mode, the wake-up process initially switches the system to

standby mode.

If one of the control units, with the exceptionof the system manager, wakes the MOST bus,it transmits specially modulated light slavelight to the next control unit.

By way of the photodiode which is active insleep mode, the next control unit in the ringreceives the slave light and passes it on.

MOST bus

SSP286_046

Recognition of light signal Initiation of system start

System manager

Operating sequences in

MOST bus

Control unit forcentral lockingsystem

Remote control

Diagnosis interfacefor data bus

(gateway)

LED is switched toslave light


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The diagnosis manager compares thereported control units (actual configuration)to a stored list of control units fitted(specified configuration).

If the actual and specified configurations do

not coincide, the diagnosis manager storescorresponding fault memory entries.

This completes the wake-up process and datatransfer can commence.

In the first frames the control units in theMOST bus are requested to provideidentification.

Based on the identification, the systemmanager transmits the current sequence

(actual configuration) to all control units inthe ring. This permits address-oriented datatransfer.

SSP286_076

FOT recognisesclosed ring

System manager

SSP286_086

LED is switched tomaster light

System managertransmits frames

Frames


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Receiver address of data source:

- CD drive,position in ring (depends on equipment)

Control commands:

- Play track 10

- Assign transmission channels

The CD drive (data source) determines whichbytes in the data field are available for

transmitting its data.

It then inserts a block with the check data.

Transmitter address of data source:

- CD drive,position in ring (depends on equipment)

Receiver address of system manager:

- Control unit for front information displayand operating unit J523, position 1 in ring

Control command:

- Data transfer/music CD on channels01, 02, 03, 04 (stereo))

By way of explanation, synchronous datatransfer is described on the basis of the modeof operation involved in playing a music CD inthe Audi A8 '03.

With the aid of the multimedia operating unitE380 and the information display unit J685,the user selects the desired track on themusic CD.

By way of a data wire, the operating unit E380

transmits the control signals to the controlunit for front information display andoperating unit J523 (system manager).Corresponding information can be found inthe Self Study Programme 293 Audi A8 03Infotainment.

The system manager then inserts a messageblock (= 16 frames) with the check data intothe frames constantly transmitted.

Transmitter address:- Control unit for front information display

and operating unit J523, position 1 in ring

MOST bus

SSP286_077Digital sound packagecontrol unit J525(data receiver)

Frame withcheck data fromdigital sound package controlunit J525

System managerControl unit for front informationdisplay and operating unit J523

Frame toCD drive

Frame todigital sound packagecontrol unit J525

CD drive(data source)

Frame with check datafrom CD drive

Multimediaoperating unit E380

Audio and video transmission in the form of

synchronous data

Function

selection


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This permits use of the synchronous data byall output units (sound package, headphoneconnections) in the MOST bus.

The system manager determines which unit isto use the data by transmitting thecorresponding check data.

Transmission channels

Audio and video transmission requires severalbytes in each data field. The data sourcereserves a number of bytes in line with thetype of signal. The bytes reserved are referred

to as channels. One channel contains one byteof data.

Number of transmission channels

Signal Channels/bytes

Mono 2Stereo 4Surround 12

This reservation of channels permits the

simultaneous transmission of synchronousdata from several data sources.

The control unit for front information displayand operating unit J523 then uses a block withthe check data

Transmitter address:

- Control unit for front information displayand operating unit J523, position 1 in ring

Receiver address:

- Digital sound package control unit J525,position in ring (depends on equipment)

Control commands:

- Read out data channels 01, 02, 03, 04 andreproduce via speakers

- Current sound settings such as volume,fader, balance, bass, treble, middle

- Deactivate muting

to issue the instruction to the digital soundpackage control unit J525 (data receiver) toreproduce the music.

The music CD data are retained in the data

field until the frame reaches the CD drive(i.e. the data source) again via the ring.The data are then replaced by fresh data andthe cycle commences again.

SSP286_078

Data management

with synchronous transmission

Channel for voice output

(e.g. mono)

Channel for CD changer

(e.g. stereo)

Channel for DVD player

(e.g. surround)

Free bytes withindata field

Navigation control unit CD changer DVD player


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The source enters the data into the free bytesin the data fields of this message block.

This takes place in packets (quadlets) of4 bytes each.

The receiver reads the data packets in thedata fields and processes the information.

The asynchronous data are retained in thedata fields until the message block returns tothe data source.

The data source extracts the data from thedata fields and replaces them with fresh dataif applicable.

The data for

Navigation system map display Navigation calculations Internet sites Email

are transmitted in the form of asynchronousdata.The asynchronous data sources transmit atirregular intervals.

For this purpose, each source stores itsasynchronous data in a latch.

The data source then waits until it receives a

message block with the address of thereceiver.

MOST bus

Transmission of data for images, messages

and functions in the form of asynchronous

data

SSP286_079

Monitor(data receiver)

Frame with data fromnavigation control unit

Navigation control unit

with latch (data source)

Frame with data fromtelephone control unit

Map displayfrom CD/DVD

Internet sitesEmail

Telephone control unit

with latch (data source)

Check datafrom monitor


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Ring fault diagnosis must be performed tolocalise a break in the ring.Ring fault diagnosis is part of the final controldiagnosis routine of the diagnosis manager.

Consequences of break in ring:

No audio and video reproduction No control and adjustment by way of

multimedia operating unit Entry in diagnosis manager fault memory

("Break in optical data bus")

Diagnosis

Diagnosis manager

In addition to the system manager, the MOSTbus also has a diagnosis manager.

This is responsible for ring fault diagnosisand transmits the diagnosis data of thecontrol units in the MOST bus to thediagnosis unit.

In the Audi A8 03, the diagnosis interface fordata bus J533 implements the diagnosticfunctions.

System malfunction

On account of the ring configuration,interruption of data transfer at a given MOSTbus location is referred to as a ring break.

Possible causes of break in ring:

Break in optical fibre Fault in power supply of transmitter or

receiver control unit Defective transmitter or receiver control

unit

Ring fault diagnosis

Ring fault diagnosis wire

As a break in the ring prevents data transferin the MOST bus, ring fault diagnosis isimplemented with the aid of a diagnosis wire.

The diagnosis wire is linked by way of acentral wiring connection to each MOST buscontrol unit.

SSP286_057


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MOST bus

Content of response

Following start of ring fault diagnosis, the MOSTbus control units transmit two items ofinformation:

1. Control unit in proper electrical working order i.e. electrical functions of control unit(e.g. power supply) are OK

2. Control unit in proper optical working order its photodiode receives the light signal fromthe preceding control unit in the ring

These messages inform the diagnosis manager

of any electrical faults in the system (fault inpower supply)

or of the control units between which there isa break in optical data transfer.

After starting ring fault diagnosis, thediagnosis manager transmits a pulse via thediagnosis wire to the control units.

This pulse causes all control units to transmitlight signals with the aid of their transmissionunit in the FOT.

In this process, all control units check

their power supply and internal electricalfunctions.

Reception of light signals from precedingcontrol unit in ring.

Each MOST bus control unit respondsfollowing a time period stipulated in itssoftware.

The time period between start of ring fault

diagnosis and control unit response enablesthe diagnosis manager to recognise whichcontrol unit has transmitted the response.

SSP286_080

Diagnosis wire

Diagnosticconnection

Break in optical fibre


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Ring fault diagnosis with increased attenuation

Ring fault diagnosis only permits detectionof a break in data transfer.

The final control diagnosis function of thediagnosis manager additionally contains ringfault diagnosis with reduced light power fordetection of increased attenuation.

The ring fault diagnosis process with reduced

power corresponds to that described above.

However, the control units switch on theirLEDs in the FOT with an attenuation of 3 dB,i.e. with light power reduced by half.

If the optical fibre is subject to increasedattenuation, the light signal reaching thereceiver is of insufficient strength. Thereceiver signals "optical problem".

The diagnosis manager thus recognises thefault location and issues a correspondingmessage in the assisted fault-finding of thediagnosis tester.

SSP286_088

Increased

attenuation,e.g. constrictedoptical fibre


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Introduction

BluetoothTM

Mobile communication and information are

gaining in importance in both the modernbusiness world and the private sector.

For example, it is not unusual for one personto use several mobile systems such as mobilephone, Personal Digital Assistant (PDA) ornotebook.

In the past, the exchange of informationbetween mobile systems required the use of ahard wire or infrared techniques.

Such non-standardised links greatly restricted

mobility or were complicated to use.

BluetoothTM technology provides the solutionby creating a standardised radio link forconnecting mobile systems from differentmanufacturers.

This technique is to be introduced for the firsttime in the Audi A8 03 to provide a wirelesslink between the telephone handset and thecontrol unit for telephone/telematics.

SSP286_085

Cordless telephone handsetin Audi A8 03

Holder forcordless telephone handset

Mobile phone

Notebook

Control unitfor telephone

Futureapplications


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Additional applications for the vehicle user

are planned for the future:

Installation of second handset at rear ofvehicle

Connection of notebooks, smart phonesand notepads to the internet forinformation transmission andentertainment

Reception and transmission of emails viauser's notebook or PDA

Transmission of addresses and telephonenumbers from user's notebook or PDA toMultimedia Interface (MMI) system

Hands-free unit for mobile phones with noadditional cable adapters

Use of BluetoothTM technology in othervehicle systems(example: remote control for

auxiliary heating)

What is BluetoothTM?

The Swedish company Ericsson proposed thedevelopment of a standardised short-rangewireless system BluetoothTM technology.

Several other companies decided to join inwith this project and today the BluetoothSpecial Interest Group (SIG) includes some

2000 companies from the fields oftelecommunications, data processing andequipment and vehicle manufacturing.

The name "Bluetooth" originates from theViking king Harald Bltand, who unifiedDenmark and Norway in the tenth century andwas known by the nickname "Blue tooth".

As this system combines a wide range ofdifferent information, data processing andmobile phone systems it reflects thephilosophy of king Harald and thus came to beknown as BluetoothTM.


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Operation

Design

Short-range transceivers (transmitters andreceivers) are either installed directly inselected mobile units or integrated by way ofan adapter (e.g. PC card, USB).

Communication takes place in the 2.45 GHzfrequency band which is freely availableworldwide.

The extremely short wavelength of this

frequency permits integration of

Aerial Control and encoding Entire transmission and reception system

into the BluetoothTM module.

The compact design of the BluetoothTMmodule makes it suitable for installation evenin miniature electronic devices.

The data transfer rate is up to 1 Mbit/s. Theunits can transmit up to three voice channelssimultaneously.

BluetoothTM transmitters have a range of tenmetres. Up to 100 metres can be achievedwith an additional amplifier for specialapplications.

Data transfer does not require anycomplicated settings.

BluetoothTM

SSP286_082

A link is automatically established betweenany two BluetoothTM units entering intocontact with one another. Before this canoccur, once-only matching of the units has tobe implemented by entering a PIN.Information on the procedure involved can befound in SSP 293 Audi A8 Infotainment.

This involves the creation of miniaturewireless cells known as "Piconet" for

organisational purposes.

One piconet provides space for a maximum ofeight active BluetoothTM units, however eachunit may form part of several picocells at thesame time. In addition, up to 256 non-activeunits can be assigned to one piconet.

One unit assumes the master function in eachpiconet:

The master establishes the link. The other units are synchronised with the

master. Only the unit receiving a data packet from

the master can transmit a response.

Example:

In the Audi A8 03, the telephone/telematicscontrol unit is the BluetoothTM master.

To avoid chaos when creating a piconet,settings can be made on each unit todetermine the unit with which it is allowed tocommunicate or not.

Each unit has a unique worldwide addresswith a length of 48 bits, thus permittingunequivocal identification of more than281 billion units.


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The control module

Divides the data into short and flexibledata packets with a duration of approx.625 s.

Uses a 16-bit checksum to check that thedata packets are complete.

Automatically re-transmits data packetssubject to interference.

Makes use of stable language encoding inwhich the language is converted intodigital signals.

The radio module

changes the transmission and receptionfrequency 1600 times per second on a

random basis after each data packet. This isreferred to as frequency hopping.

Operation

Data transfer in the BluetoothTM systeminvolves the use of radio waves in a frequencyrange between 2.40 and 2.48 GHz.

This frequency range is also used for otherapplications.

Examples:

Garage door openers Microwave ovens Medical appliances

Interference immunity

Through the use of measures designed toenhance interference immunity, BluetoothTM

technology reduces the interference causedby such equipment.

SSP286_083

Master message (request)

Slave message (response)

Jamming by otherelectronic devices(e.g. microwave)

Time [t]min. 625 s

1 MHz

2.402 GHz

2.480 GHz

*

* Transmission range: 79 1 MHz channels

{


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As the range is restricted to 10 metres,manipulation can only take place within thisarea, thus additionally enhancing datasecurity.

The above-mentioned interference immunitymeasures also increase the level of protectionagainst manipulation of the data stream.

Data security can be further increased byequipment manufacturers through theadditional use of complex encoding methods,different security levels and network

protocols.

BluetoothTM

Data security

During the development of BluetoothTMtechnology, the manufacturers placed greatemphasis on the protection of the datatransmitted against manipulation andunauthorised monitoring.

A 128-bit code is used to encode the data.

The authenticity of the receiver is alsochecked with a 128-bit code. In this processthe units use a secret password for mutualidentification of the individual users.

A new code is generated for each link.


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The measured value blocks provide a display

of

The number The unit number The field strength of the radio link

of the portable units communicating with themaster control unit.

The BluetoothTM function can be activated ordeactivated in the BluetoothTM masteradaption process.

Examples:

Transportation of vehicle by air Use of vehicle in countries where

BluetoothTM frequencies are notauthorised

Diagnosis

The diagnostic procedure for the BluetoothTM

link is implemented with the aid of the mastercontrol unit address word.

Example:

In the Audi A8 03, the telephone/telematicscontrol unit J526 is the BluetoothTM master.

Address word Telephone 77Emergency call module 75

The BluetoothTM link between the telephonehandset and the telephone/telematics controlunit J526 is monitored by checking theBluetoothTM aerial.

An entry is made in the fault memory if thereis a break in the link with the aerial.

BluetoothTM aerial

No signal/no communication


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Introduction

The diagnosis CAN is used to exchange data

between the diagnosis unit and the controlunits fitted in the vehicle, thus obviating theneed for the K or L-wires previously required(exception: emission-specific control units).Diagnosis is implemented using the vehiclediagnostic, testing and information systemVAS 5051 or the vehicle diagnostic and serviceinformation system VAS 5052.

The control-unit diagnostic data aretransmitted by way of the respective data bus

system to the diagnosis interface for data busJ533 (gateway).

Thanks to the rapid data transfer via the CANand the high performance of the gateway, thediagnosis unit is able to display a list of thecomponents fitted and their fault statusimmediately after connection to the vehicle.

The diagnosis CAN uses a non-screenedtwisted pair of wires with a cross-section of0.35 mm2 each.

The CAN low wire is orange/brown and the

CAN high wire orange/violet.

Data are transferred at a rate of 500 kbit/s infull duplex mode. This means that data can betransmitted in both directions at once.

Diagnosis bus

SSP286_055

SSP286_012

Diagnosis CAN

MOST

Dash panel insert CAN

Drive system CAN

Convenience CAN

Adaptive cruise control CAN

CAN low

CAN high

Diagnosis interfacefor data bus(gateway)


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The current basic software version is alsorequired for diagnosis.

VAS 5051: Basic software 3.0 for diagnosisvia CAN

VAS 5052: Basic software

Basic software modification is accompaniedby the addition of new functions and

alterations to the tester user interface.

SSP286_051

VAS 5052Vehicle diagnostic and service information systemVersion -GB- / V01.02 20/08/2001

Vehicleself-diagnosis

Elsa Win

Administration

Help

Diagnosis can be implemented under thefollowing conditions:

No. Diagnosis Condition Remarks

1

2

3

Start

Implementation

End

With ignition on Yes

With ignition off Yes, but not

in sleep mode

With ignition on Yes

With ignition off Yes, but no

write functions

(e.g. control unit

encoding)

Termination by switching off Noignition

Wake-up ofcontrol unit viadiagnosis CAN

is notpossible

SSP286_056

Applications

Print

Implementation of diagnosis on the vehiclerequires use of the new diagnosis wires

VAS 5051/5A (3 m) or VAS 5051/6A (5 m).These new diagnosis wires can also beused with the familiar diagnosis systemsemploying K or L-wire.


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Diagnosis bus

Extension of forms of address

In addition to the direct addressing ofindividual control units, provision is now alsomade for group addressing, i.e. the faultmemory content of several control units canbe interrogated more or less simultaneously.

This considerably speeds up readout of thefault memory content.

Selective control element test

The selective control element test permits

direct activation of actuators without havingto adhere to a specified sequence.

In addition, it is possible to simultaneouslydisplay control-unit measured value blocks forchecking switches and sensors.

These new features offer additional options aspart of assisted fault-finding.

SSP286_089

SSP286_090

Assisted fault-finding

Functional test

Selective control element test, -J520 CU 2Vehicle electrical system

Audi V00.03 25/04/2002Audi A8 2003>2003 (3)

SaloonBFL 3.7l Motronic / 206 kW

Test sequence

The control element routine permits selectiveactuation of individual control elements of vehiclevoltage control unit 2 if fitted/encoded.

Ready

1. Functional

description

Measurement Vehicle self-

diagnosis

Jump Print Help


Functional test

Selective control element test, -J520 CU 2

Vehicle electrical system

Audi V00.03 25/04/2002Audi A8 2003>2003 (3)SaloonBFL 3.7l Motronic / 206 kW

Control element interrogation 1 to 6

Which control element is to be actuated?(control element selection 1 to 6)

1. Retract MMI display rotation mechanism2. Extend MMI display rotation mechanism3. KI58D 90% interior light dimming4. Servotronic/full power assistance5. Servotronic/no power assistance6. Extend right headlight washer system nozzle

- 1 -

1. Functional

description

Measurement Vehicle self-

diagnosis

Jump Print Help

- 2 -

- 3 -

- 4 -

- 5 -

- 6 -

- Return -


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Pin assignment at diagnostic connector

Pin Wire

1 Terminal 154 Earth5 Earth6 Diagnosis CAN (high)7 K-wire14 Diagnosis CAN (low)15 L-wire16 Terminal 30

Pins not listed are not used at present.SSP286_052

Example:

The illustration shows the selective controlelement test for vehicle voltage control unit 2J520 in the Audi A8 03 for checking thedisplay mechanism.

SSP286_091


Functional test

Selective control element test, -J520 CU 2

Vehicle electrical system

Audi V00.03 25/04/2002Audi A8 2003>2003 (3)

SaloonBFL 3.7l Motronic / 206 kW

With measured values/messages

Active control element: Extend MMI display rotationmechanism

Measured values/messages:

MMI limit switch open: Not actuatedMMI limit switch closed: ActuatedMMI motor : Inactive

Continue with

1. Functionaldescription

Measurement Jump Print Help


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Notes


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ssp 286 new data bus systems (2)

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