ProCarManuals.com288Service.AUDI A8 ´03 - Distributed FunctionsSelf Study Programme 288For internal use onlyThis Self Study Programme contains information on data bus networking (topology) and distributed functions in the Audi A8 ´03. An understanding of the interaction of the components and distributed functions forms the necessary basis for successful fault-finding.This introduction contains explanatory notes to clarify the meanings of certain terms, designations and symbols used in this Self Study Programme. More detailed information can be found in the following Self Study Programmes: – SSP 282 – Audi A8 ´03 Technical Features – SSP 286 – New Data Bus Systems – LIN, MOST, BluetoothTM – SSP 287 – Audi A8 ´03 Electrical Components – SSP 289 – Adaptive cruise control in the Audi A8 ´03 – SSP 293 – Audi A8 ´03 InfotainmentDefinition of terms Data bus network (topology) The topology provides a general outline of the way in which control units fitted in the vehicle are interlinked by way of data bus systems. It thus becomes clear which bus systems are used by the control units to exchange data. Distributed functions This term indicates that several control units are required to exchange information in order to implement a function. Function master With distributed functions, one control unit is always responsible for the entire sequence of operations. The function master control unit gathers all input information. The requests resulting from this are then transmitted in the form of a message on the data bus system and read into the control units concerned for corresponding actuation of the appropriate connected components. Substitute master In the event of function master failure affecting major functions, the task of the function master is assumed by a control unit provided for this purpose and designed to maintain the sequence of operations (possibly with certain restrictions). Example: Wiper speed 1 functionWiring Convenience CAN Drive system CAN Adaptive cruise control CAN1Components and symbolsProCarManuals.comDash panel insert CAN MOST bus LIN busA number is used to designate the information sequence described in the corresponding text. The green circle symbolises the start of an information sequence.J400Diagnosis CAN Bidirectional wire Reception wire Transmission wire Discrete wire Wireless transmission – transmission signal Wireless transmission – reception signal Follow-up function PrerequisiteThe green arrow indicates input information.J519 E22The blue arrow indicates output information.J527Ignition ONThe layout of the individual components such as control units, switches or control elements as illustrated corresponds to the actual arrangement in the vehicle. Component designations are explained on the basis of their identifiers in the relevant text.J518 SSP288_013Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 transmits terminal 15 and 75x – information – to convenience CAN. 1 The intermittent wiper switch E22 transmits the information "Wiper speed 1" to the steering column electronics control unit J527. 2 The steering column electronics transmits the information "Wiper speed 1" to the onboard power supply control unit J519. 3 The onboard power supply control unit transmits the information "Wiper speed 1" via the LIN to the wiper motor control unit J400. The wiper motor control unit actuates the integrated motor.Components marked in red indicate the function master within a sequence of operations.Components marked in yellow indicate the substitute master(s).ContentsPage Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Distributed FunctionsSwitch/display illumination dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Right turn signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Crash signalling (without airbag triggering) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Hazard warning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Anti-theft alarm flashing function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Advanced Key unlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Advanced Key locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Automatic boot lid release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Left parking light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Dipped beam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Dipped beam (automatic) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Reversing lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Wiper speed 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Flick wipe with headlight washing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Interior light actuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Driver identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29ProCarManuals.comThe Self Study Programme contains information on design features and functions. The Self Study Programme is not intended as a Workshop Manual. Values given are only intended to help explain the subject matter and relate to the software version applicable at the time of SSP compilation. Use should always be made of the latest technical publications when performing maintenance and repair work.NewAttention Note3IntroductionBus topologyControl unit with display in dash panel insert J285Distance regulation control unit -J428Diagnostic connection T16Dash panel insert CANDiagnosis CAN Drive system CANSteering angle sender G85 Seat adjustment control unit, front passenger J521ProCarManuals.comElectric park and handbrake control unit J540Headlight range control unit J431Airbag control unit J234ABS with EDL control unit J104Engine electronics 1 J623Engine electronics 2 J624Adaptive suspension control unit J197Automatic gearbox control unit J217Internal bus linkAnti-theft/tilt system control unit J529Boot lid control unit J605Wiper motor control unit J400Garage door operation control unit J530Multifunction steering wheel E221LINConvenenience system central control unit J393 Onboard power supply control unit J519 Onboard power supply control unit 2 J520 Steering column electronics control unit J527Door control unit, driver side J386Door control unit, front passenger side J387Door control unit, rear left J388Door control unit, rear right J389Seat adjustment control unit J1364BluetoothTMRear DVD changer R162 Control unit for rear right information display and operating unit J649 Telephone/ telematics control unit J526 Telephone handset R37Control unit for rear left information display and operating unit J648Adaptive cruise control CANFront information display and operating unit control unit J523DSP control unit J525Data bus diagnostic interface J533MOST busNavigation control unit J401ProCarManuals.comCD ROM drive R92TV tuner R78Convenience CANCD changer R41Digital radio R147Chip card reader control unit J676Radio module RFresh-air blower control unit J126Heated windscreen control unit J505Rear left footwell heater element Z42Rear right footwell heater element Z43Driver seat ventilation control unit J672Front passenger seat ventilation control unit J673LINClimatronic control unit J255 Rear seat adjustment with memory control unit J522 Trailer detector control unit J345 Energy management control unit J644 Entry and start authorisation control unit J518 Parking aid control unit J446Rear Climatronic control and display unit E265Tyre pressure monitor control unit J502Sunroof electronics control unit J528Additional heater control unit J364Driver identification control unit J589LINDriver side rear seat ventilation control unit J674 Front passenger side rear seat ventilation control unit J675 Sliding sunroof motor V1 Auxiliary heating radio controlled receiver R64SSP288_015 5Distributed FunctionsSwitch/display illumination dimmingE1J519 Ignition ON J518Control units connected to convenience CANProCarManuals.comJ285 J533Control units connected to MOST bus SSP288_018Prerequisite Ignition switched on by way of electric ignition/ 4 The dash panel insert transmits the starter switch or Advanced Key, so that entry information "Term. 58s" via the dash panel and start authorisation control unit J518 insert CAN to the data bus diagnostic connects terminals 15 and 75 to convenience interface. CAN. 5 The data bus diagnostic interface transmits 1 The driver sets the light switch E1 to this signal to the convenience CAN and "Dipped beam ON" position. the MOST bus. Each connected control unit The light switch transmits a voltageuses this message to generate a PWM signal encoded signal to the onboard power for actuation of the connected illumination supply control unit J519. systems with the set level of dimming. 2 The onboard power supply control unit transmits the information "Dipped beam ON" to the convenience CAN. 3 The data bus diagnostic interface J533 transmits the information via the dash panel insert CAN to the control unit with display in dash panel insert J285, where the CAN information "Term. 58s" is generated.6Right turn signalM7 J519 M19E2 J527 J285 J533 Ignition ON J518ProCarManuals.comJ691 J393 Right turn signal indicator on trailer J345 SSP288_001Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 connects terminal 15 to convenience CAN. 4 The convenience system central control unit actuates the rear right turn signal indicator by way of the right tail light control unit J691 and the onboard power supply control unit J519 actuates both the front right turn signal bulb M7 and the right side turn signal bulb M19. 5 The data bus diagnostic interface J533 passes the CAN information "Right turn signal" to the dash panel insert CAN. The lamp in the dash panel insert then flashes. 6 The trailer turn signal indicator is actuated by the trailer detector control unit J345 which received the message "Right turn signal".1 The driver sets the turn signal switch E2 to the right. The switch transmits a resistance-encoded signal to the steering column electronics control unit J527. 2 The steering column electronics control unit relays the information "Right turn signal" via the convenience CAN to the convenience system central control unit J393. 3 The convenience system central control unit establishes priorities and type of indication on the basis of the information received. The convenience system central control unit then transmits the information "Right turn signal" to the convenience CAN.7Distributed FunctionsCrash signalling (without airbag triggering)J519M19M18M7 J528 Interior lighting ONM5ProCarManuals.comJ386 F220J387 F221J388 F222 G256 G257 J389 F223 Drive system CAN G283 G284 G435 G436 J364 J234J393 8J690J691 SSP288_0031 One or more crash sensors (G256, G257, G283, G284, G435 or G436) transmit(s) the information "Vehicle crash" to the airbag control unit J234. 2 The information "Crash" is relayed by the airbag control unit via a discrete wire to the convenience system central control unit J393 and the drive system CAN. 3 The information is processed by the convenience system central control unit and the message "Crash detected" passed to the convenience CAN. The convenience system central control unit blocks remote controlled locking. 4 The door control units J386 to J389 then actuate the central locking lock units F220 to F223. All doors are unlocked. The door control units block door locking by the interior locking switches. 5 The onboard power supply control unit J519 actuates the front turn signal bulbs M5, M7 and the side turn signal bulbs M18, M19. 5a The convenience system central control unit actuates the tail light control units J690 and J691 to implement the rear signalling function. 6 The sunroof electronics control unit J528 switches on the interior lighting. 7 The additional heater control unit J364 switches the auxiliary heater to run-on mode.ProCarManuals.com9Distributed FunctionsHazard warningE3M19 J519 M7M18M5ProCarManuals.comJ285 J533J393J690J691 SSP288_0121 The driver actuates the hazard warning light switch E3, which transmits the discrete information "Hazard warning" to the onboard power supply control unit J519. 2 The onboard power supply control unit transmits the information "Hazard warning" via the convenience CAN to the convenience system central control unit J393. 3 The convenience system central control unit specifies the type of indication and transmits the information "Hazard warning mode" to the convenience CAN.104 The onboard power supply control unit J519 actuates the front turn signal bulbs M5 and M7 as well as the side turn signal bulbs M18 and M19. The convenience system central control unit actuates the rear turn signal bulbs (M6 and M8) via the tail light control units J690 and J691. 5 The data bus diagnostic interface J533 actuates the hazard warning indicator lamps in the dash panel insert display via the dash panel insert CAN.Anti-theft alarm flashing functionJ528M7M5M19M18J519 J285 J533ProCarManuals.comJ393 J690 J691J529H12 SSP288_002Prerequisite Anti-theft alarm activated by "Central locking system locking". Interior monitoring/anti-towaway system not deactivated by buttons in driver's door. 1a The interior monitor transmission and reception module integrated into the sunroof electronics control unit J528 detects movement in the passenger compartment. This information is transmitted by the sunroof electronics control unit to the convenience CAN. or 1b The anti-theft/tilt system control unit J529 transmits the information "Tilt alarm" via the LIN to the convenience system central control unit J393. 2 The convenience system central control unit specifies the type of indication and transmits the information "Alarm flashing mode" to the convenience CAN. 3 The onboard power supply control unit J519 actuates the front turn signal bulbs M5, M7 and the side turn signal bulbs M18, M19. The convenience system central control unit actuates the rear indicators via the corresponding tail light control units J690 and J691. 4 The data bus diagnostic interface J533 actuates the alarm indicator lamps in the dash panel insert display via the dash panel insert CAN. 5 The convenience system central control unit actuates the alarm horn H12 via a bidirectional wire.11Distributed FunctionsAdvanced Key unlockingJ519 M19 M18M7M5J528 Interior lighting ONJ533 J285ProCarManuals.comJ386 F220/F131J387 F221/F132 J388 F222/F133 J389 F223/F134J518 R47R134 G415 R155Vehicle keyJ393 12J690J691 SSP288_0041 The driver grasps hold of the recessed door handle moulding. The driver side exterior door handle touch sensor G415 transmits the information "Finger in handle moulding" to the entry and start authorisation control unit J518. 2 The control unit transmits the information "Key interrogation" to the driver side and rear driver side entry and start authorisation aerials R134 and R155. 3 The driver side entry and start authorisation aerials transmit this information to the vehicle key outside the vehicle.9The central locking actuators F131 to F134 in the central locking lock units transmit the information "Doors unlocked" to the door control units.10 The door control units transmit the information "Doors unlocked" to the convenience system central control unit. 11 The convenience system central control unit transmits the information "Vehicle not locked" to the convenience CAN. 12 The sunroof electronics control unit J528 starts the function "Interior lighting ON". 13 The convenience system central control unit transmits the information "Flashing after central locking unlocking" to the convenience CAN. 14 The data bus diagnostic interface J533 actuates the flash indicator lamps in the dash panel insert display via the dash panel insert CAN. 15 The convenience system central control unit actuates the rear indicators via the tail light control units J690 and J691 for two flashing cycles. The onboard power supply control unit J519 actuates the front turn signal bulbs M5, M7 and the side turn signal bulbs M18, M19 for two flashing cycles.ProCarManuals.com4 The vehicle key transmits the information "Key identification" to the central locking and anti-theft alarm system aerial R47. 5 The central locking and anti-theft alarm system aerial transmits this information to the entry and start authorisation control unit. 6 The entry and start authorisation control unit transmits the information "Convenience unlocking" to the convenience system central control unit J393 and to the door control unit for the door handle at which key interrogation was started. 6a The door control unit receiving the command from the entry and start authorisation control unit, actuates the lock unit, which unlocks the door. 7 The convenience system central control unit transmits the information "Vehicle unlocking – Advanced Key" to the convenience CAN. 8 The door control units J386 to J389 evaluate the information "Advanced Key unlocking" and actuate the central locking lock units F220 to F223. The doors are unlocked.13Distributed FunctionsAdvanced Key lockingJ519 M19 M18M7M5J528 Interior lighting OFFJ285 J533ProCarManuals.comR47 J518 R155Vehicle keyR134 E369 J386 F220/F131J387 F221/F132 J388 F222/F133 J389 F223/F134J393 14J690J691 SSP288_0061 The driver presses the driver side outer door handle central locking button E369. The button transmits the information "Lock vehicle" by way of a discrete wire to the driver side door control unit J386, which in turn transmits the signal via the convenience CAN to the entry and start authorisation control unit J518. 2 The control unit transmits the information "Key interrogation" to the driver side and rear driver side entry and start authorisation aerials R134 and R155. 3 The driver side entry and start authorisation aerials transmit this information to the vehicle key outside the vehicle. 4 The vehicle key transmits the information "Key identification" to the central locking and anti-theft alarm system aerial R47. 5 The central locking and anti-theft alarm system aerial transmits this information to the entry and start authorisation control unit. 6 The entry and start authorisation control unit transmits the information "Lock" to the convenience system central control unit J393. 7 The convenience system central control unit transmits the information "Lock vehicle – Advanced Key" to the convenience CAN. 8 The door control units J386 to J389 evaluate the information "Lock" and actuate the central locking lock units F220 to F223. The doors are locked and the locks isolated. 9 The central locking actuators F131 to F134 in the central locking lock units transmit the information "Doors locked and locks isolated" to the door control units.10 The door control units transmit the information "Doors locked and locks isolated" to the convenience system central control unit. 11 The convenience system central control unit transmits the information "Vehicle locked" to the convenience CAN. 12 The sunroof electronics control unit J528 starts the function "Interior lighting OFF". 13 The convenience system central control unit transmits the information "Flashing after central locking system locking" to the convenience CAN. 14 The data bus diagnostic interface J533 actuates the flash indicator lamps in the dash panel insert display via the dash panel insert CAN. 15 The convenience system central control unit actuates the rear indicators via the tail light control units J690 and J691 for two flashing cycles. The onboard power supply control unit J519 actuates the front turn signal bulbs M5 and M7 as well as the side turn signal bulbs M18 and M19 for two flashing cycles.ProCarManuals.comFor greater clarity, the handles of the passenger's and rear doors are not shown. Operation by way of these buttons is the same as for the driver's door.15Distributed FunctionsAutomatic boot lid releaseE463 J386Vehicle key R47 J518 V139ProCarManuals.comF332/V278J393 J605F248 SSP288_014a) Release via button in driver's door 1a The driver presses the boot lid remote release button E463, which transmits the discrete information "Release boot lid" to the driver side door control unit J386. 2a The driver side door control unit transmits the information "Release boot lid" via the convenience CAN to the convenience system central control unit J393. – Sequence continues with Item 4 –b) Release via button in boot lid (handle cover strip) 1b The driver presses the release button for boot lid lock cylinder F248, which transmits the discrete information "Release boot lid" to the convenience system central control unit. – Sequence continues with Item 4 –16c) Release via button in vehicle key 1c The driver presses the "Boot lid" button in the vehicle key, which transmits a radio signal to the central locking and anti-theft alarm system aerial R47. 2c The "Release boot lid" signal is received by the central locking and anti-theft alarm system aerial and transmitted via a discrete wire to the entry and start authorisation control unit J518. 3c The entry and start authorisation control unit transmits the information "Release boot lid" via the convenience CAN to the convenience system central control unit.ProCarManuals.com4The convenience system central control unit actuates the boot lid release motor V139. The button in the boot lid release motor transmits the information "Boot lid released" to the convenience system central control unit. The convenience system central control unit transmits the information "Release boot lid" via the LIN to the boot lid control unit J605. The convenience system central control unit actuates the boot lid power latching system motor V278. The striker pin moves upwards. The power latching system limit switch, luggage compartment unlocked F332 transmits "Striker pin up" to the convenience system central control unit, which stops the boot lid power latching system motor.567817Distributed FunctionsLeft parking lightJ519M43 E2J527J533J285Ignition OFF J518ProCarManuals.comJ393 J690 J692J644SSP288_010Prerequisite Ignition switched on by way of electric 4 The convenience system central control unit ignition/starter switch or Advanced Key, so that J393 actuates the left tail light control unit entry and start authorisation control unit J518 J690 and the tail light control unit for lights connects terminal P to convenience CAN. on left in boot lid J692 via a discrete wire. Light switch E1 set to OFF position. 4a The information "LED lighting 10 %" is transmitted via a bidirectional wire to the 1 The driver sets the turn signal switch E2 tail light. to the left. The switch transmits a resistance-encoded signal to the steering 5 The onboard power supply control unit column electronics control unit J527. actuates the left parking light bulb M43. 2 The steering column electronics control 6 The data bus diagnostic interface J533 unit transmits the information "Left parking passes the CAN information "Parking light" light" via the convenience CAN to the to the dash panel insert CAN. The warning onboard power supply control unit J519. buzzer in the dash panel insert sounds as soon as the driver's door contact switch 3 The onboard power supply control unit passes the information "Door OPEN" via the transmits the information "Left parking door control unit to the dash panel insert light active" to the convenience CAN. CAN.18Dipped beamE1J519M31M44M43M29J533J285Ignition ON J518ProCarManuals.comJ692J693J690 J393 XJ691SSP288_007Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 connects terminal 15 to convenience CAN. 3 The convenience system central control unit J393 actuates the LEDs in the tail light control units J690, J691, J692 and J693 via discrete wires. The two number plate lights X are also actuated. 3a The information "LED lighting 10 %" is transmitted via a bidirectional wire to the tail lights. 4 The onboard power supply control unit actuates the left and right parking light bulbs M43, M44 and the left and right dipped beam bulbs M29, M31. 5 The data bus diagnostic interface J533 transmits the information via the dash panel insert CAN to the control unit with display in dash panel insert J285, where the CAN information "Term. 58s" and "Term. 58d" is generated. This information is required for switch and display illumination.1 The driver sets the light switch E1 to "Dipped beam ON" position. The light switch transmits a voltage-encoded signal to the onboard power supply control unit J519. 2 The onboard power supply control unit transmits the information "Dipped beam ON" to the convenience CAN.19Distributed FunctionsDipped beam (automatic)E1 M31 M44 M43 M29J519J528G397 J285J533 Ignition ON J518ProCarManuals.comJ692J693J690 J393 XJ691SSP288_008Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 connects terminals 15 and 75 to convenience CAN. 5 The convenience system central control unit J393 actuates the LEDs in the tail light control units J690, J691, J692 and J693. The two number plate lights X are also actuated. 5a The information "LED lighting 10 %" is transmitted via a bidirectional wire. 6 The onboard power supply control unit actuates the left and right parking light bulbs M43, M44 and the left and right dipped beam bulbs M29, M31.1 The driver sets the light switch E1 to position AUTO – "Automatic dipped beam". 2 The rain and light detector sensor G397 connected to the sunroof electronics control unit J528 relays the signal "Light ON" detected to the sunroof electronics control unit.7 The data bus diagnostic interface J533 transmits the information via the dash panel 3 The information "Light ON" is conveyed via insert CAN to the control unit with display in the convenience CAN to the onboard power dash panel insert J285, where the CAN supply control unit J519. information "Term. 58s" and "Term. 58d" is generated. This information is required for 4 The onboard power supply control unit switch and display illumination. transmits the information "Dipped beam ON" to the convenience CAN.20Reversing lightsJ528J533J217J519 Ignition ON J518J393ProCarManuals.comM16 E48 J386M17Front passenger's exterior mirror J387 J446SSP288_011Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 connects terminal 15 to convenience CAN. 4 The convenience system central control unit J393 discretely actuates the left M16 and right M17 reversing light bulbs. 5 The sunroof electronics control unit J528 deactivates the automatic folding mechanism of the right interior mirror. 6 The parking aid control unit J446 activates the rear parking aid. 7 The driver side door control unit J386 transmits the information "Mirror selection right" from the mirror adjustment changeover switch E48 to the convenience CAN. 8 The front passenger side door control unit J387 moves the exterior mirror into low position.1 The information "Reverse gear" is transmitted by way of a contact at the automatic gearbox control unit J217 via the drive system CAN to the data bus diagnostic interface J533. 2 The data bus diagnostic interface transmits the information "Reverse gear" to the convenience CAN. 3 The onboard power supply control unit J519 transmits the information "Reversing light switch ON" to the convenience CAN.21Distributed FunctionsWiper speed 1J400 J519E22 J527ProCarManuals.comIgnition ON J518 SSP288_013Prerequisite Ignition switched on by way of electric ignition/ starter switch or Advanced Key, so that entry and start authorisation control unit J518 transmits terminal 15 and 75x – information – to convenience CAN.1 The intermittent wiper switch E22 transmits the information "Wiper speed 1" to the steering column electronics control unit J527. 2 The steering column electronics transmits the information "Wiper speed 1" to the onboard power supply control unit J519. 3 The onboard power supply control unit transmits the information "Wiper speed 1" via the LIN to the wiper motor control unit J400, which actuates the integrated motor.22Flick wipe with headlight washingJ520V248 V11 J39V249V5 J400ProCarManuals.comJ519E1E22 J527 Ignition ON J518 SSP288_009Prerequisite Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 transmits terminal 15 and 75x – information – to convenience CAN. 3 The steering column electronics control unit transmits the information "Wash windscreen" to the convenience CAN. 4 The onboard power supply control unit J519 transmits the information "Windscreen washer pump ON" via the LIN to the wiper motor control unit J400. 5 The wiper motor control unit actuates the windscreen washer pump V5. 6 On the basis of the information "Wash windscreen" and "Dipped beam ON", the onboard power supply control unit 2 J520 actuates the pop-up washer jet motors V248, V249 and the headlight washer system pump V11 via the headlight washer system relay J39 after a delay of one second.1 The driver sets the light switch E1 to dipped beam. The onboard power supply control unit J519 transmits the information "Dipped beam ON" via the convenience CAN to the onboard power supply control unit 2 J520. 2 The driver sets the intermittent wiper switch E22 to "Flick wash" position for more than one second. The switch outputs a voltage-encoded signal to the steering column electronics control unit J527.23Distributed FunctionsInterior light actuationJ519J528 L152 L151 Door contour lighting J386 J387J707Door contour lightingProCarManuals.comDoor contour lighting J388 J389Door contour lightingL106 J393L107 SSP288_020The distributed functions relating to interior light actuation are highly complex. The functions are therefore split up here into three categories.Basic functions: a) Manual interior light control (at corresponding light) b) Central brightening/dimming on opening/ closing doors c) Lighting profiles by way of "ambiente" lighting Each basic function also contains certain special functions.24ProCarManuals.com1 The driver presses the lighting profile 3 The onboard power supply control unit button on the sunroof electronics control J519 conveys the signal received to the unit J528. front left L151 and front right L152 The signal is transmitted on the footwell illumination, which is then convenience CAN in line with the lighting switched on. profile preset in the MMI and the activated key. 4 The door control units J386 to J389 After selection, the lighting profile is stored actuate the appropriate door contour for each key recognised in the sunroof lights in the selected lighting profile. electronics control unit J528. 5 The convenience system central control unit J393 actuates the rear left L106 and 2 If necessary (depending on lighting profile), rear right L107 footwell illumination. the sunroof electronics control unit relays the signal to the rear roof console, thus switching the rear roof console to standby mode. The rear interior light is not switched in until the rear door contact switches are actuated. All interior lights activated remain on until all door contacts signal "Doors closed" again. a) Manual interior light control Interior light control is always performed in the sunroof electronics control unit. The operating elements are located at the front in the sunroof electronics control unit J528 and at the rear in the roof console. The functions of the two operating units are separate. If the interior lighting is switched on manually with terminal 15 OFF, all interior lights and the make-up lights are switched off following last button actuation. Special function: Brightness adjustment Keeping the ON button at the interior light pressed for a lengthy period causes the corresponding interior light to be dimmed and brightened again until the button is released. Briefly releasing the button only interrupts adjustment. After releasing the button, the corresponding brightness value is stored. Special function: Control of rear lighting from front The rear lighting is controlled by touching a front button twice. In other words: Front 1 x ON = Front lighting on Front 2 x ON = Front and rear lighting on25Distributed FunctionsSpecial function: Transfer of brightness value to rear Once the front brightness value has been set by keeping the button pressed once, the same brightness value can be transferred to the rear by pressing the button again. If this value is not acceptable to the rear passenger, the value stored in the sunroof electronics control unit at the front can be restored by renewed pressing of the ON button at the rear roof console.SSP288_021Special function: Childproof lock If the childproof lock has been activated for both rear doors via the buttons in the driver's door, neither the interior lighting nor the rear and side roller blinds can be operated from the roof console. The rear roller blind can be operated from the front. It is however possible to activate the rear reading lights. Sequence of operations: The door control unit passes the message "Activate childproof lock" to the convenience CAN. This is read in by the sunroof electronics control unit J528. The control unit then blocks operation at the rear.ProCarManuals.com26b) Central brightness adjustment: Brightening and dimming on opening/ closing doors On setting central locking to OPEN (remote control key or keyless entry) The entire interior lighting – Interior light – Door contour lighting (optional) – Footwell lighting is brightened within 1.5 seconds to 100 %. Special function: If the vehicle automatically re-locks, dimming takes place at the same time. If a door is opened, dimming takes place after 10 minutes. After closing the door, dimming is implemented after 2 minutes if the ignition is not switched on. On activating terminal 15, the interior lights are dimmed immediately. If a rear door is opened with terminal 15 active, the rear interior light only is in operation when the LED in the rear door contact button lights.SSP288_021If no door is opened, the interior lights are dimmed again and switched off after 2 minutes.ProCarManuals.comIf a front door is opened with terminal 15 active, the front interior light only is in operation when the LED in the front door contact button lights. If both a front and a rear door are opened with terminal 15 active, the front and rear interior lights come on when the LED in the corresponding door contact button lights. Dimming however only takes place again when all doors have been locked. Special function: Dimming If a brightness value has been set for the corresponding light, it will be dimmed to this value after closing the doors.27Distributed Functionsc) Lighting profiles by way of "ambiente" lightingUserThe lighting profile functions are stored in the sunroof electronics control unit. The lighting profiles are selected via the MMI in the CAR menu under "Ambiente" lighting. Following selection and confirmation via the rotary/pushbutton control, the lighting profile is displayed and the brightness value can be adjusted. This value is stored in the sunroof electronics control unit on exit from the menu. Special function: Lighting profile buttonCar "Ambiente" lightingHighway City Cockpit Rear OffLogbookSystemsTPMaintenanceSSP288_023ProCarManuals.comWhilst driving, the selected lighting profile can only be activated and deactivated by the driver via the lighting profile button. As a general rule, the lighting profiles are only active with terminal 15 ON. Switching off the ignition causes the interior lights to be dimmed and switched off. If the lighting profile has been deliberately activated via the light button with terminal 15 ON, it remains active even with terminal 15 OFF and is only deactivated 30 minutes after leaving the vehicle. Locking the vehicle results in immediate deactivation.SSP288_022Operation via the interior light button as described under a) is still possible.28Driver identificationVehicle key E415J518Convenience CAN control units used with the systemProCarManuals.comE408/J589J5331 The vehicle key is to be inserted in the ignition/starter switch. The entry and start authorisation switch E415 is actuated. 2 The S-contact terminal signal is then transmitted to the entry and start authorisation control unit J518, which passes this information to the convenience CAN.3The "S-contact terminal" signal is applied to the driver identification control unit J589. If a stored finger is then placed on the entry and start authorisation button E408, the driver identification control unit transmits the user ID to the convenience CAN. The control units involved with the memory system recognise the user ID and set the stored values.29ProCarManuals.com30NotesProCarManuals.com31ProCarManuals.comAll rights reserved. Subject to technical modification. Copyright* 2002 AUDI AG, Ingolstadt Department I/VK-35 D-85045 Ingolstadt Fax 0841/89-36367 000.2811.08.20 Technical status as at 09/02 Printed in Germany288