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326Vorsprung durch Technik www.audi.co.ukService TrainingAudi A6 ‘05 – ElectricsSelf-Study Programme 326All rights reserved.Subject totechnical change.CopyrightAUDI AGI/VK-35Service.training@audi.deFax 49-841/89-36367AUDI AGD-85045 IngolstadtTechnical release 01/04Printed in GermanyA04.5S00.09.20
The Audi A6 – the most progressive vehicle takes the leadThe new Audi A6 – the most progressive vehicletakes the lead.The new Audi A6 consistently adopts the highlynetworked electronic architecture, which is alreadyused in the Audi A8. Overall, new technologies allowthe A6 to match up with its "model" vehicle, the AudiA8. Features, which were previously reserved forluxury vehicles, are now also available in the topclass segment.In combination with these diverse capabilities,the underlying technology has, of course,been enhanced considerably.The use of the most modern network technologies,such as CAN, LIN, MOST and Bluetooth, and therelated distributed vehicle functions signals thearrival of a new generation of vehicle electrics inthis class.Some of these are safety-related features, such asthe combined rain/light sensor or the pivotingcornering headlight. Comfort features of the topclass, such as the MMI operating system orsophisticated functionalities for the mobilebaseplate, which is available ex-works, are part andparcel of these new saloons.The new Audi A6 has everything that is needed tobecome the Number One model in the top-classrange.It combines many different, attractive componentsto form one unit. Design and performance gohand-in-hand. The new Audi A6 will take overas the most progressive vehicle.Number One: With Design & Performance
ContentsOverviewControl unit installation positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Bus topology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Installation positions of fuses and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Convenience electricsControl unit for power management J644 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Access and start authorisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Immobiliser and component protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30External lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Control unit in dash panel insert J285 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Control unit for on-board power supply J519 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Control unit 2 for on-board power supply J520 . . . . . . . . . . . . . . . . . . . . . . . . . . 52Central control unit for convenience system J393 . . . . . . . . . . . . . . . . . . . . . . . . 55Door control units J386 - J389 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Control units for seat adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65InfotainmentMultimedia interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Antenna systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75Control unit for front information J523 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Sound systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81Available telephone systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86The Self-Study Programme provides information on the fundamentals of design and function of new vehiclemodels, 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 versionthat was valid at the time the Self-Study Programme (SSP) was created.For maintenance and repair work, please make sure to use the current technical documentation.ReferenceNote
OverviewControl unit installation positions1234567891011124Auxiliary heating control unit J364Control unit for ABS with EDL J104Control unit for distance control J428Transmitter unit in wheel well for tyre pressuremonitoring, front left G431Control unit for on-board power supply J519Door control unit, driver's side J386Control unit for access andstart authorisation J518Control unit in dash panel insert J285Control unit for steering column electronics J527Control unit for telephone, telematics J526Telephone transmitter and receiver R36Engine control unit J623Climatronic control unit J25513 Control unit for seat adjustment with steeringcolumn adjustment memory J13614 Level control unit J197Control unit for headlight range control J431Control unit for tyre pressure monitoring J502Control unit 2 for onboard power supply J520Control unit for display and operating unit forfront information J523Data bus diagnosis interface J533Antenna read-in unit for keyless accessauthorisation J72315 CD changer R41CD ROM drive R9216 Door control unit, rear left J38817 Airbag control unit J234
326 14618 Rotation rate sensor 20219 Door control unit, 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 pressuremonitoring, rear left G43323 Radio receiver for auxiliary heating R6424 Control unit for navigation with CD drive J401Control unit for voice input J507Digital sound package control unit J525Radio RTV tuner R78Digital radio R14725 Transmitter unit in wheel well for tyre pressuremonitoring, rear right G43426 Parking aid control unit J446Control unit for trailer detection J34527 Central control unit for convenience system J39328 Control unit for electric parking andhand brake J54029 Control unit for power management J6445
OverviewBus topologyDistance controlJ428Control unit in dashpanel insertJ285Data bus diagnosisfor data busJ533Diagnosis connectionT16NOX sensorJ583Engine electronics 1J623Door control unit,driver’s sideJ386Power managementJ644Rotation rate sensorG202ABS with EDLJ104Door control unit,passenger’s sideJ387Auxiliary heatingJ364Seat occupiedrecognitionJ706AirbagJ234Door control unit,rear leftJ388Parking aidJ446AutomatictransmissionJ217Door control unit,rear rightJ389On-board powersupply 2J520Headlight rangecontrolJ431Seat adjustmentwith memorySteering columnadjustmentJ136Access andstart authorisationJ518Electric parkingand hand brakeJ540Seat adjustmentwith memory,passenger’s sideJ521On-board powersupplyJ519Level controlJ197Trailer detectionJ345Centr. contr. unit forconvenience systemJ393Power modulefor left headlightJ667Power module forright headlightJ668Steering-anglesensorG856Steering steering wheelJ453Tyre pressuremonitoringJ502
Telephonetransmitter andfor telephoneR36Handsetfor telephoneR37Telephone/telematicsJ526Display andoperating unit forfront informationJ523Navigationwith CD driveJ401TV tunerR78CD changerR41Digitalsound packageJ525Radio moduleRVoice inputJ507MOST busCAN Instrument clusterSwitch foraccess andstart authorisationE415Antenna read-inunit for keyless accessauthorisationJ723CAN DiagnosisCAN DriveCAN ConvenienceWiper motorJ400Sensor for rain andlight detectionG397CAN Distance controlLIN busPassengercompartmentmonitoringG273Alarm hornH12Various sub-bus systemsWireless transmission– Bluetooth signalFresh air fanJ126Transmitter,front leftG431Refrigerant pressure andrefrigerant temperatureG395Transmitter,front rightG432Transmitter,rear leftG433Transmitter,rear rightG434Antenna, rearR96326 0277
OverviewInstallation positions of fuses and relays1 E box in radiator tank, left2 Relay and fuse holder behinddash 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, right8
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Convenience electricsControl unit for power management J644The basic design of the control unit for powermanagement is the same as the control unit used inthe Audi A8 ‘03.It is installed in the boot well, next to the battery.This control unit has been adapted for use in theAudi A6 ’05 in that it now has revised software,which shows the battery condition rather than thebattery charge level in the MMI display.Furthermore, the diagnosis tester can be used toread out history data, i.e. data relating to thecondition of the on-board power supply in the past.326 094ReferenceThe basic functions of the control unit for powermanagement J644 are described in the SSP 287.Battery conditionThe battery condition indicates how efficient thebattery is. The efficiency is determined from thebattery charge level and the ability to start.UserCarOn-board manualBattery conditionAdvantages of the battery condition:– The cut-off stages can be allocated directly to thebattery condition.– The messages in the central display of dashpanel insert J285 always appear for the samebattery condition reading.– A 100 % display indicates that no cut-off stagewill be set the next time the engine is switchedoff.10SystemsMaintenance326 072
History dataThe diagnosis tester can be used to read outdata from the control unit for power management,which makes it much easier to analyse the on-boardpower supply and the battery.Steady battery dischargeThe battery condition is 100 % when the battery ischarged.As soon as cut-off level 1 is activated, the MMI"Battery condition" display drops to 90 % and thengoes down to 60 % in steps. If cut-off level 1, 2 or 5is set when the display reads 90 %, the message"Power-saving mode active" appears for a short timeon the central display of dash panel insert J285.In addition, the battery symbol in the dash panelinsert indicates power-saving mode for the entireload switch-off duration.Electrical system (Rep. Gr. 01; 90 - 97)61 – Battery controlJ644 – Control unit for power management, FunctionsPOWER-SAVINGMODEACTIVEOpen-circuit voltage historyIf the battery open-circuit voltage is less than thethreshold values of 12.5 volts, 12.2 volts and11.5 volts, an entry is written to the history data.The last four entries can always be read out.A – 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 modeVoltage measurement starts when– CAN Convenience is in Sleep mode and– terminal 15 is switched off for at least 2 hoursand– the vehicle’s power consumption is 100 mA.326 123Voltage measurement ends when– the voltage increases or– the current increases or– the control unit triggers Sleep mode or– the control unit detects a new battery.Battery conditionCut-off levels 1, 2 or 5Cut-off level 3POWER-SAVINGMODEACTIVEBATTERYLOWCut-off level 6Time/MinutesSelecting a function or componentAudiAudi A6 2005 2005 (5)SaloonBBJ 3.0l Motronic / 160 kW01 – Self-diagnosis systems326 061POWER-SAVINGMODEACTIVEGuided fault-findingFunction/component selectionClosed-circuit current historyBattery change historyIf the closed-circuit current exceeds the thresholdvalue of 50 mA, an entry is written to the historydata. The last ten entries can be read out.Data for the last three battery changes is stored.Current measurement starts when– CAN Convenience is in Sleep mode and– terminal 15 is switched off for at least 2 hoursand– the vehicle’s power consumption is 50 mA.Power balance history – driving ( engine on)The power balance and duration of the last fivejourneys are logged.Time/Minutes326 036Current measurement ends when– the current decreases or– the control unit triggers Sleep mode.As soon as cut-off level 3 is activated, the "Batterycondition" display drops to 50 % and then goesdown to 20 % in steps.Power balance history – idle ( engine off)The power balance and duration of the last five idletimes are logged.Breakdown analysisIf the control unit for power management detectsthe status "Cannot start vehicle", an entry is writtento the history data.If the battery condition drops to 10 %, cut-off level 6is active. In cut-off level 6, the message"BATTERY LOW" appears in the central display of thedash panel insert after the ignition is switched on.Other data is not relevant for Customer Service.Cut-off level historyBATTERYLOWData for the last 15 cut-off levels is stored.326 06112
Convenience electricsAccess and start authorisationFunction diagramLegendE369E408E415Central locking button for outer door handle,driver’s side*Central locking button for outer door handle,passenger’s side*Central locking button for outer door handle,rear left*Central locking button for outer door handle,rear right*Button for access and start authorisationSwitch for access and start authorisationF272F273F274F275F305Outer door handle switch, driver’s door*Outer door handle switch, passenger’s door*Outer door handle switch, rear left*Outer door handle switch, rear right*Switch for gearbox position P**E370E371E3721Terminal 50 (to starter B)2CAN Convenience High3CAN Convenience Low4P/N signal from control unit forautomatic transmission J217**5Terminal 58s (lighting)*6Signal from brake light switch F*G415 Sensor for outer door handle contact,driver’s side*G416 Sensor for outer door handle contact,passenger’s side*G417 Sensor for outer door handle contact,rear left*G418 Sensor for outer door handle contact,rear 47R134R135R137R138Start requestStarter relayVoltage supply relay, terminal 15Door control unit, driver's sideDoor control unit, passenger's sideDoor control unit, rear leftDoor control unit, rear rightControl unit for access andstart authorisationEngine control unitVoltage supply relay, terminal 75xStarter relay 2Antenna read-in unit for keyless accessauthorisation*Antenna for central locking andanti-theft warning systemAntenna on driver’s side for accessaccess and start authorisation*Antenna on passenger’s side for accessaccess and start authorisation*Luggage compartment antenna for accessaccess and start authorisation*Passenger compartment antenna 1 foraccess and start authorisation*UlockPositive supplyInput signalOutput signal* only for vehicles with Advanced Key** only for vehicles with automatic transmission13GroundBi-directional line
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Convenience electricsSystem overviewThe Advanced Key system was introduced with theAudi A8 '03 and has been fundamentally revised forthe Audi A6 ’05.The most important new feature is that the controlunit for access and start authorisation has beencombined with the actuator for steering columnlocking.16
1 Door control unit, driver's side J3862 Control unit for on-board power supply J5193 Control unit for access and startauthorisation J5184 Switch for access and start authorisation E4155 Central locking button for outer door handle,driver's side E369Outer door handle switch in driver’s door F272Sensor for outer door handle contact,driver’s side G4156 Antenna read-in unit for keyless accessauthorisation J7237 Antenna on driver’s side for accessand start authorisation R1348 Door control unit, rear left J3889 Passenger compartment antenna 1 forand start authorisation R13810 Door control unit, passenger's side J38711 Central locking button for outer door handle,rear left E371Outer door handle switch, rear left F274Sensor for outer door handle contact,rear left G41712 Central locking button for outer door handle,passenger’s side E370Outer door handle switch in passenger’sdoor F273Sensor for outer door handle contact,passenger's side G41613 Antenna on passenger’s side for accessand start authorisation R13514 Door control unit, rear right J38915 Antenna for central locking andanti-theft warning system R4716 Central locking button for outer door handle,rear right E372Outer door handle switch, rear right F275Sensor for outer door handle contact, rearright G41817 Boot antenna for accessand start authorisation R137326 14717
Convenience electricsDivision of functionsSystem control is broken down into three basicmodules:– the control unit for access andstart authorisation J518,– the antenna read-in unit for keyless accessauthorisation J723 and– the switch for access andstart authorisation E415.All three components communicate with each otherover a local single-wire bus.The control unit for access and start authorisation isthe master of the system and a participant onConvenience. The same control unit is installed forall system versions.The antenna read-in unit for keyless accessauthorisation is only installed with theAdvanced Key option. It serves as the interfacebetween the antennae, sensors and the control unitfor access and start authorisation.The switch for access and start authorisation isinstalled in various versions, depending on thetransmission, radio frequency of the central lockingsystem and the Advanced Key option. An evaluationelectronic device is also integrated into the switch.18Access andstart authorisationJ518Antenna read-inunit forkeyless accessauthorisationJ723Switch foraccess and startauthorisationE415326 064
Switch for access and start authorisation E415VersionsThe switch for access and start authorisation isavailable in the following versions:– with and without Advanced Key function– with and without ignition key anti-removal lock– for radio frequencies of 315 MHz, 433 MHz or868 MHzFunctionsEmergency release326 122The switch for access and start authorisationincludes other functions apart from the ignitionswitch function:– Evaluation of the key position of the ignitionswitch:The ignition switch evaluates the ignition keyposition using four switches.The switch information is transferred to thecontrol unit for access and start authorisation inbinary code via the local bus and also formonitoring purposes, via two lines.The lock barrel in the ignition switch is not codedmechanically, which means that the turningmovement can be performed with everyA6 '05 key.326 066– Safety branch for the steering lock of the controlunit for access and startauthorisation:In addition to the switch-offs in the control unitfor access and start authorisation, the voltagesupply for the motor of the electromechanicalsteering lock is interrupted in the switch foraccess and start authorisation in order toprevent the steering column lockingautomatically.If terminal 15 is switched on, the voltage supplyis always switched off.ULock326 06719
Convenience electrics– Reading in position P of the automatictransmission from the switch for gearboxposition P F305:The signal is used to activate the integrated,magnetic ignition key anti-removal lock. If thevehicle battery is flat, the key can be removed bypressing the mechanical emergency release.326 068– Reading in the information from the button foraccess and start authorisation E408 (only forvehicles with Advanced Key):For safety reasons, the positions of the button foraccess and start authorisation are evaluated bythe switch for access and start authorisation.–326 069– Reading in the information from the antenna forcentral locking and anti-theft warningsystem R47:The switch for access and start authorisationpasses the data, which the vehicle key sends viaremote control, on to the control unit for accessand start authorisation. The control unitevaluates the data.– Reading in the signal from the brake lightswitch F (only for vehicles with Advanced Key):To start the vehicle using the button for accessand start authorisation, the brake pedal must beactuated
AUDI AG I/VK-35 Service.training@audi.de Fax 49-841/89-36367 AUDI AG D-85045 Ingolstadt Technical release 01/04 Printed in Germany A04.5S00.09.20 Audi A6 ‘05 – Electrics Self-Study Programme 326 Vorsprung durch Technik www.audi.co.uk Service Training
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Build your Audi A6 Page 28 Vorsprung durch Technik in your Audi A6 Page 70 Buying and maintaining your Audi A6 Create the car you’ve always imagined. Trim choice Page 40 Your colour Page 54 Your design Page 58 Your upholstery Page 60 Your detail Page 62 Your options Page 64 Your configurator Page 68
Service.training@audi.de Fax 49-841/89-36367 AUDI AG D-85045 Ingolstadt Tec hnical status: 05/04 Printed in Germany A04.5S00.12.20 The new Audi A4 05 Self-Study Programme 343 Vorsprung durch Technik www.audi.de Service Training. Audi introduces a new model generation that is obvious at first glance. The front-end styling of both saloon and Avant models is new, with the addition of the .
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