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1 326 All rights reserved. Subject to technical +49-841/89-36367 audi AGD-85045 IngolstadtTechnical release 01/04 Printed in A6 05 ElectricsSelf-Study Programme 326 Vorsprung durch Technik TrainingThe new audi A6 the most progressive vehicle takes the new audi A6 consistently adopts the highly networked electronic architecture, which is already used in the audi A8. Overall, new technologies allow the A6 to match up with its "model" vehicle , the audi A8. Features, which were previously reserved for luxury vehicles, are now also available in the top-class combination with these diverse capabilities, the underlying technology has, of course, been enhanced use of the most modern network technologies, such as CAN, LIN, MOST and Bluetooth, and the related distributed vehicle functions signals the arrival of a new generation of vehicle electrics in this of these are safety-related features, such as the combined rain/light sensor or the pivoting cornering headlight.

2 Comfort features of the top class, such as the MMI operating system or sophisticated functionalities for the mobile baseplate, which is available ex-works, are part and parcel of these new new audi A6 has everything that is needed to become the Number One model in the top-class range. It combines many different, attractive components to form one unit. Design and performance go hand-in-hand. The new audi A6 will take over as the most progressive audi A6 the most progressive vehicle takes the leadNumber One: With Design & PerformanceNoteReferenceNoteReferenceCon trol unit installation positions .. 4 Bus topology.. 6 Installation positions of fuses and relays.. 8 OverviewConvenience electricsControl unit for power management J644.. 10 Access and start authorisation.

3 13 Immobiliser and component protection .. 30 External lights.. 32 Control unit in dash panel insert J285 .. 40 Control unit for on-board power supply J519 .. 42 Control unit 2 for on-board power supply J520 .. 52 Central control unit for convenience system J393 .. 55 Door control units J386 - J389 .. 63 Control units for seat adjustment.. 65 InfotainmentMultimedia interface .. 68 Antenna systems.. 75 Control unit for front information J523.. 76 Sound systems.. 81 Available telephone systems.. 86 The Self-Study Programme provides information on the fundamentals of design and function of new vehicle models, new vehicle components or new technologies. The Self-Study Programme is not a Workshop Manual!Specified values serve only to make the information easier to understand and relate to the software version that was valid at the time the Self-Study Programme (SSP)

4 Was maintenance and repair work, please make sure to use the current technical Auxiliary heating control unit J3642 Control unit for ABS with EDL J1043 Control unit for distance control J4284 Transmitter unit in wheel well for tyre pressure monitoring, front left G4315 Control unit for on-board power supply J5196 Door control unit, driver's side J3867 Control unit for access and start authorisation J5188 Control unit in dash panel insert J2859 Control unit for steering column electronics J52710 Control unit for telephone, telematics J526 Telephone transmitter and receiver R3611 Engine control unit J62312 Climatronic control unit J25513 Control unit for seat adjustment with steering-column adjustment memory J13614 Level control unit J197 Control unit for headlight range control J431 Control unit for tyre pressure monitoring J502 Control unit 2 for onboard power supply J520 Control unit for display and operating unit for front information J523 Data bus diagnosis interface J533 Antenna read-in unit for keyless access authorisation J723 15 CD changer R41 CD ROM drive R9216 Door control unit, rear left J38817 Airbag control unit J234 Control unit installation positions518 Rotation rate sensor 20219 Door control unit.

5 Passenger's side J38720 Control unit for seat adjustment with memory, passenger s side, J52121 Door control unit, rear right J38922 Transmitter unit in wheel well for tyre pressure monitoring, rear left G43323 Radio receiver for auxiliary heating R6424 Control unit for navigation with CD drive J401 Control unit for voice input J507 Digital sound package control unit J525 Radio R TV tuner R78 Digital radio R147 25 Transmitter unit in wheel well for tyre pressure monitoring, rear right G43426 Parking aid control unit J446 Control unit for trailer detection J34527 Central control unit for convenience system J39328 Control unit for electric parking and hand brake J54029 Control unit for power management J644326_1466 Bus topologyOverviewNOX sensorJ583 Rotation rate sensorG202 Seat occupied recognitionJ706 Power module for left headlightJ667 Power module for right headlightJ668 Level controlJ197 Electric parking and hand brakeJ540 Headlight range controlJ431 Automatic transmissionJ217 AirbagJ234 ABS with EDLJ104 Engine electronics 1J623 Diagnosis connectionT16 Control unit in dash panel insertJ285 Distance control J428 Data bus diagnosis for data busJ533 Door control unit, driver s sideJ386 Door control unit.

6 Passenger s sideJ387 Door control unit, rear leftJ388 Door control unit, rear rightJ389 Seat adjustment with memory Steering column adjustmentJ136 Seat adjustment with memory, passenger s sideJ521 Trailer detectionJ345 Steering column electronics J527 Multi-function steering wheelJ453 Steering-angle sensorG85 Power management J644 Auxiliary heatingJ364 Parking aidJ446On-board power supply 2J520 Access and start authorisationJ518On-board power supplyJ519 Centr. contr. unit for convenience systemJ393 ClimatronicJ255 Tyre pressure monitoringJ5027326_027 Display and operating unit for front informationJ523Te l ep h o n e transmitter and for telephoneR36CD changerR41 Digital sound packageJ525 Switch for access and start authorisationE415 Antenna read-in unit for keyless access authorisationJ723 Wiper motorJ400 Sensor for rain and light detectionG397 Passenger compartment monitoringG273 Alarm hornH12 Fresh air fanJ126 Refrigerant pressure and refrigerant temperatureG395 Transmitter,front leftG431 Transmitter,front rightG432 Transmitter,rear leftG433 Transmitter,rear rightG434 Antenna.

7 RearR96Te l e p h on e/telematicsJ526 Handset for telephoneR37 Navigation with CD driveJ401TV tunerR78 Radio moduleRVoice inputJ507 MOST busCAN Instrument clusterCAN DiagnosisCAN DriveCAN ConvenienceCAN Distance controlLIN busVarious sub-bus systemsWireless transmission Bluetooth signal8 OverviewInstallation positions of fuses and relays1 E box in radiator tank, left2 Relay and fuse holder behind dash panel, left3 Fuse holder in dash panel, left4 Main fuse carrier in radiator tank, right5 Fuse holder in dash panel, right6 Relay and fuse holder in the boot, right9326_14810 The basic design of the control unit for power management is the same as the control unit used in the audi A8 is installed in the boot well, next to the control unit has been adapted for use in the audi A6 05 in that it now has revised software, which shows the battery condition rather than the battery charge level in the MMI , the diagnosis tester can be used to read out history data, data relating to the condition of the on-board power supply in the electricsReferenceThe basic functions of the control unit for power management J644 are described in the SSP conditionThe battery condition indicates how efficient the battery is.

8 The efficiency is determined from the battery charge level and the ability to of the battery condition: The cut-off stages can be allocated directly to the battery condition. The messages in the central display of dash panel insert J285 always appear for the same battery condition reading. A 100 % display indicates that no cut-off stage will be set the next time the engine is switched manualBattery conditionSystemsMaintenanceControl unit for power management J644326_094 AudiAudi A6 2005>2005 (5)SaloonBBJ Motronic / 160 kWGuided fault-findingFunction/component selectionSelecting a function or componentElectrical system (Rep. Gr. 01; 90 - 97)01 Self-diagnosis systems61 Battery controlJ644 Control unit for power management, FunctionsA Battery, Charge levelA Battery, Battery testingJ644 Power management, General descriptionJ644 Control unit for power management, CodingJ644 Read out history dataJ644 Power management, Read measured-value blocksJ644 Power management, Query fault memoryJ644 Data link tests for generator voltageJ644 Replace control unitJ644 Power management, Activate/deactivate Transport modeBattery change historyData for the last three battery changes is balance history driving (= engine on)The power balance and duration of the last five journeys are balance history idle (= engine off)

9 The power balance and duration of the last five idle times are data is not relevant for Customer dataThe diagnosis tester can be used to read out data from the control unit for power management, which makes it much easier to analyse the on-board power supply and the battery. Open-circuit voltage historyIf the battery open-circuit voltage is less than the threshold values of volts, volts and volts, an entry is written to the history data. The last four entries can always be read measurement starts when CAN Convenience is in Sleep mode and terminal 15 is switched off for at least 2 hours and the vehicle s power consumption is < 100 measurement ends when the voltage increases or the current increases or the control unit triggers Sleep mode or the control unit detects a new current historyIf the closed-circuit current exceeds the threshold value of 50 mA, an entry is written to the history data.

10 The last ten entries can be read measurement starts when CAN Convenience is in Sleep mode and terminal 15 is switched off for at least 2 hours and the vehicle s power consumption is > 50 measurement ends when the current decreases or the control unit triggers Sleep analysisIf the control unit for power management detects the status "Cannot start vehicle ", an entry is written to the history level historyData for the last 15 cut-off levels is battery dischargeThe battery condition is 100 % when the battery is soon as cut-off level 1 is activated, the MMI "Battery condition" display drops to 90 % and then goes down to 60 % in steps. If cut-off level 1, 2 or 5 is set when the display reads 90 %, the message "Power-saving mode active" appears for a short time on the central display of dash panel insert J285.