Audi A6 2005 - Electrics Service Training
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Audi A6 2005 - Electrics Service Training

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Service Training
Audi A6 '05 – Electrics
Self-Study Programme 326

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  • Page 1 Service Training Audi A6 ‘05 – Electrics Self-Study Programme 326...
  • Page 2 The Audi A6 – the most progressive vehicle takes the lead The new Audi A6 – the most progressive vehicle takes the lead. 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"...

  • Page 3: Table Of Contents

    Contents Overview Control unit installation positions ........4 Bus topology.

  • Page 4: Control Unit Installation Positions

    Overview Control unit installation positions 1 Auxiliary heating control unit J364 13 Control unit for seat adjustment with steering- 2 Control unit for ABS with EDL J104 column adjustment memory J136 3 Control unit for distance control J428 14 Level control unit J197 4 Transmitter unit in wheel well for tyre pressure Control unit for headlight range control J431 monitoring, front left G431...
  • Page 5 326_146 18 Rotation rate sensor 202 25 Transmitter unit in wheel well for tyre pressure 19 Door control unit, passenger's side J387 monitoring, rear right G434 20 Control unit for seat adjustment with memory, 26 Parking aid control unit J446 passenger’s side, J521 Control unit for trailer detection J345 21 Door control unit, rear right J389...

  • Page 6: Bus Topology

    Overview Bus topology Distance control J428 Control unit in dash panel insert J285 Data bus diagnosis for data bus J533 Diagnosis connection Door control unit, Power management sensor Engine electronics 1 driver’s side J644 J583 J623 J386 Door control unit, Rotation rate sensor ABS with EDL Auxiliary heating...
  • Page 7 Telephone transmitter and for telephone Handset Telephone/ Display and for telephone telematics operating unit for J526 front information J523 Navigation with CD drive J401 TV tuner CD changer Digital Radio module Voice input sound package J507 J525 MOST bus CAN Instrument cluster Switch for Antenna read-in access and...

  • Page 8: Installation Positions Of Fuses And Relays

    Overview Installation positions of fuses and relays 1 E box in radiator tank, left 2 Relay and fuse holder behind dash panel, left 3 Fuse holder in dash panel, left 4 Main fuse carrier in radiator tank, right 5 Fuse holder in dash panel, right 6 Relay and fuse holder in the boot, right...
  • Page 9 326_148...
  • Page 10 It is installed in the boot well, next to the battery. This 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 display.
  • Page 11 History data The diagnosis tester can be used to read out Guided fault-finding Audi Audi A6 2005> data from the control unit for power management, Function/component selection Steady battery discharge 2005 (5) which makes it much easier to analyse the on-board...

  • Page 12: Access And Start Authorisation

    Convenience electrics Access and start authorisation Function diagram Legend E369 Central locking button for outer door handle, Terminal 50 (to starter B) driver’s side* E370 Central locking button for outer door handle, CAN Convenience High passenger’s side* E371 Central locking button for outer door handle, CAN Convenience Low rear left* E372...
  • Page 13 326_038...
  • Page 14 Convenience electrics System overview The Advanced Key system was introduced with the Audi A8 '03 and has been fundamentally revised for the Audi A6 ’05. The most important new feature is that the control unit for access and start authorisation has been combined with the actuator for steering column locking.
  • Page 15 1 Door control unit, driver's side J386 11 Central locking button for outer door handle, 2 Control unit for on-board power supply J519 rear left E371 3 Control unit for access and start Outer door handle switch, rear left F274 authorisation J518 Sensor for outer door handle contact, 4 Switch for access and start authorisation E415...
  • Page 16 Convenience electrics Division of functions System control is broken down into three basic modules: – the control unit for access and start authorisation J518, Antenna read-in – the antenna read-in unit for keyless access Access and unit for start authorisation keyless access authorisation J723 and J518...
  • Page 17 Switch for access and start authorisation E415 Versions The switch for access and start authorisation is available 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 or 868 MHz Emergency release 326_122...
  • Page 18 Convenience electrics – Reading in position P of the automatic transmission from the switch for gearbox position P F305: The signal is used to activate the integrated, magnetic ignition key anti-removal lock. If the vehicle battery is flat, the key can be removed by pressing the mechanical emergency release.
  • Page 19 Control unit for access and start authorisation J518 The electromechanical steering column lock was integrated into the control unit for access and start authorisation. Functions – Terminal control: – Locking the steering column: The control unit for access and start The motor and gears for locking the steering authorisation puts the information about column are integrated into the control unit for...
  • Page 20 Convenience electrics – CAN Communication: The control unit is a participant on CAN Convenience. Data exchange between all the components of the access and start authorisation system is performed via the control unit. It is also the diagnosis interface for the components involved.
  • Page 21 Vehicle key The key has a mechanically coded hinged bit for the lock cylinder in the driver’s door and the tailgate/ boot lid. The transponder function is integrated into the electronics and also works without a battery. An integrated battery powers the electronics for the radio remote control and Advanced Key functions.
  • Page 22 Convenience electrics Antenna read-in unit for keyless access authorisation J723 The control unit is only installed together with the Advanced Key option. It is located at the right of the dash panel, behind the glove compartment. It evaluates the signals from the outer door handle sensors and then activates the antennae for access and start authorisation.
  • Page 23 Antennae for access and start authorisation E134 - R138 Four transmitting antennae are distributed in the vehicle and are used by the vehicle for radio communication with the vehicle key. The antennae transmit on a frequency of 24.5 kHz. The vehicle key evaluates all four signals and determines the position in or on the vehicle based on the field strength of the individual antennae.
  • Page 24 Convenience electrics Opening the vehicle Antenna for central locking and anti-theft warning system Antenna on Passenger passenger’s side for compartment access start antenna 1 for start authorisation authorisation R135 R138 Antenna on driver’s Boot antenna for side for access access start authorisation start authorisation R134...
  • Page 25 1 The driver puts his/her hand into the finger well 6 The control unit for access and start of the door handle. The sensor for outer door authorisation sends the information "Opening handle contact G415 sends the information vehicle" on to the central control unit for the "Finger in finger well"...
  • Page 26 Convenience electrics Starting the vehicle using the button Antenna for central locking and anti-theft warning system Passenger Antenna on compartment passenger’s side for antenna 1 for access access start and start authorisation authorisation R135 R138 Boot antenna for Antenna on driver’s access side for access start authorisation...
  • Page 27 1 The driver presses the button for access and 6 Based on the key evaluation, the S contact is start authorisation E408 down fully. The button sent to CAN Convenience and the steering is sends the information about "Ignition on" and unlocked.

  • Page 28: Immobiliser And Component Protection

    Audi A6 ’05. immobiliser This means that all components must be "taught" Control unit, which is integrated into the online, as is already the case with the Audi A8 ´03 immobiliser and the Audi A3 ´04. Master control unit The following components are integrated into the...
  • Page 29 New identity As is already the case with the Audi A8 ‘03 , if a Guided fault-finding Audi Audi A6 2005> control unit is stolen, it is no longer necessary Function test 2005 (5) Teaching driving authorisation Saloon (for safety reasons) to also replace the remaining systems BBJ 3.0l Motronic / 160 kW...

  • Page 30: External Lights

    Convenience electrics External lights Front headlights Three different front headlights are used in the Audi A6 ’05: – Halogen headlights – Bi-xenon headlights – Adaptive light Halogen headlights Halogen headlights come as standard. The following lamps are fitted in the halogen on the vehicle equipment: –...
  • Page 31 Bi-xenon headlights Bi-xenon headlights are installed with the "XenonPlus" option. The following lamps are fitted in the bi-xenon headlight: – A blue W5W lamp for the parking light. The colour of the parking light thus corresponds to the xenon light. –...
  • Page 32 Convenience electrics Adaptive light The adaptive light works as a dynamic corner- sensitive headlight. With the dynamic cornering headlight, the headlight projection module is pivoted horizontally by an integrated motor. The headlight lenses and the bracket do not turn. The pivot angle is approx. 15° on the inner curve Pivot range side and 7.5°...
  • Page 33 Internal structure Gas discharge light L13/L14 The pivot angle is monitored by an inductive pickup in the pivot module. The pickup value is evaluated immediately in the relevant power module for headlights as a pulse width-modulated signal. If the motor or pickup does not function, the power module sends an error message to the control unit for headlight range control J431.
  • Page 34 326_085 Show Room function The Show Room function can be used to pivot the Guided fault-finding Audi Audi A6 2005> headlights by moving the steering wheel – even Function/component selection 2005 (5) Saloon when the vehicle is stationary – for presentation.
  • Page 35 Back lights Different tail lights are used in the Audi A6 ’05, depending on the equipment variant. This is differentiated into the following: – Basic variant ECE – High variant ECE – High variant SAE Basic variant ECE The tail light in the basic variant only uses lamps...
  • Page 36 Convenience electrics High variant ECE These back lights are installed if bi-xenon headlights at least are fitted as the front headlights. The external feature of the High back lights is the use of LEDs for the brake light. The LEDs, which are fixed in the reflector housing, are activated by two contacts from the lamp bracket.
  • Page 37 High variant SAE Brake light and Tail lights The back lights for the North American market have direction indicator light standard LED units. The LED units are used for the indicator and brake light function. The three sections underneath are for the tail light lamps.

  • Page 38: Control Unit In Dash Panel Insert J285

    Convenience electrics Control unit in dash panel insert J285 326_145 The control unit in dash panel insert J285 is available in two variants. The High-Line variant with colour display only comes in vehicles with adaptive cruise control. As in the A8 '03, the anti-drive-off feature and gateway are no longer integrated into the dash panel insert.
  • Page 39 Function diagram 326_037 Legend E493 Operating button for dash panel insert Additional signal Oil pressure switch Terminal 58d Warning contact for brake fluid level Switch for low coolant display Terminal 58s Warning contact for windscreen washer level Sender for fuel level indicator Pre-feed fuel pump Temperature sensor for outside temperature Sensor for brake pad wear, front left...

  • Page 40: Control Unit For On-Board Power Supply J519

    The main function of the control unit for on-board power supply is to read in switch information and activate power outputs. It is familiar from the Audi A8 ‘03 and has been adapted to new functionalities in the Audi A6 ´05. 326_107...
  • Page 41 Emergency function The software for the control unit for on-board power supply can be used to implement emergency functions. If a fault is detected in the rotary light switch or if there is an open circuit in the line to the rotary light switch, the control unit for on-board power supply switches the driving light on.
  • Page 42 Convenience electrics Function diagram Light switch Indicator light for parking light Hazard warning light switch Indicator light for hazard warning lights Fog light switch Indicator light for rear fog light Switch for rear fog light Indicator light for fog lights Reversing light switch Lamp for light-switch lighting F266 Contact switch for bonnet...
  • Page 43 326_111 N395 Magnet for cover adjustment, Additional signals left headlight N396 Magnet for cover adjustment, Terminal 58 right headlight Terminal 58s Windscreen washer pump Left control motor for headlight range control CAN Drive High Right control motor for headlight range control CAN Drive Low V123 Motor for vertical steering column...
  • Page 44 Convenience electrics System overview The control unit for on-board power supply J519 evaluates the following input signals: – Hall sender 1 for vertical adjustment of the – Rotary light switch steering column – Hazard warning button – Hall sender 2 for axial adjustment of the steering column –...
  • Page 45 Diagnosis Basic settings After the control unit for on-board power supply J519 or the steering column or the switch for steering column adjustment E167 is replaced, a basic setting in axial and vertical position must be implemented for the steering column. Actuator test An actuator test can be used to carry out the following checks:...
  • Page 46 Sensor for rain and light detection G397 A combined sensor for rain and light detection is Terminal 30 used for the first time in the Audi A6 ’05. The sensor includes a light-control assistant function, which relieves the driver of the job of...
  • Page 47 Function of the light sensor In order to detect certain ambient conditions, such as tree-lined avenues or routes through tunnels, the light sensor registers the light intensity in two areas. Light sensor The global field describes the direct brightness on the vehicle, while the fore-field describes the lighting conditions in the section of road lying ahead of the vehicle.
  • Page 48 Convenience electrics Function of the rain sensor The rain sensor uses the physical light refraction principle to register the amount of moisture on the windscreen. The circular LEDs integrated in the sensor emit infrared light through the windscreen from within the interior of the vehicle. LEDs Photodiode 326_091...
  • Page 49 The control unit for wiper motor J400 was redesigned for use in the new Audi A6 ’05. As is already the case in the Audi A8 ‘03 and Audi A3 ’04, the control unit and wiper motor are integrated into one housing.

  • Page 50: Control Unit 2 For On-Board Power Supply J520

    Convenience electrics Control unit 2 for on-board power supply J520 An additional on-board power supply control unit is needed in the Audi A6 ´05 because of the huge range of functions it offers. Functions Control unit 2 for on-board power supply J520 includes the following functions: –...
  • Page 51 Function diagram 326_082 Legend Additional signals E316 Glove compartment button CAN Convenience High J520 Control unit 2 for on-board power supply N119 Solenoid valve for Servotronic CAN Convenience Low Motor for sliding roof V327 Motor for glove compartment release...
  • Page 52 The tilt sensor for the anti-theft warning system is integrated directly in control unit 2 for on-board Note power supply J520 in the new Audi A6 ‘05. The tilt sensor function can be switched off The fluid-filled sensor registers changes in the using a button in the driver’s door panel.

  • Page 53: Central Control Unit For Convenience System J393

    Central control unit for convenience system J393 The central control unit for the convenience system J393, with which you may be familiar from the Audi A8 '03, is used in the Audi A6 ’05. The tasks and functions have been adapted according to requirements.
  • Page 54 Convenience electrics Installation position The central control unit for the convenience system is installed above the battery in the rear right of the boot. 326_114 System overview The central control unit for the convenience system J393 receives the following input signals: –...
  • Page 55 Interior lighting control Standard equipment function The standard function includes activating the inside light in the roof lining, the front footwell lights, the glove compartment light and the boot light. The central control unit for the convenience system J393 activates the inside light in the roof lining, the boot light and the glove compartment light directly via its own outputs and inputs.
  • Page 56 Convenience electrics Function diagram Interference filter for windscreen antenna Relay for rear window heater J393 Central control unit for convenience system Switch for glove compartment light Lamp for rear fog light, left F124 Contact switch for lock cylinder for tailgate/boot lid, anti-theft warning system, Lamp for tail light, right central locking Lamp for tail light, left...
  • Page 57 326_120 Motor for tailgate/boot lid central locking Additional signals Motor for rear sun blind V155 Motor for tank cap locking CAN Convenience High Glove compartment light CAN Convenience Low W14 Illuminated make-up mirror, passenger’s side W18 Boot light, left Brake light switch F W20 Illuminated make-up mirror, driver’s side W35 Boot light, right ESP brake signal from control unit for ABS...
  • Page 58 Convenience electrics Diagnosis The central control unit for convenience system, J393, has the usual diagnostic functions, such as read fault memory, read measured value blocks, adaptation, coding, as well as selective and sequential actuator test at its disposal. Actuator test The selective actuator test initiated by the diagnosis tester can be used to check the following actuators: Note...
  • Page 59 You may already be familiar with the acoustic parking aid function "APS" from the Audi A3 ´04. For use in the Audi A6 ´05, a 4-channel system with sensors on the rear bumper and an 8-channel system with sensors on the front and rear bumpers are available.
  • Page 60 Warning buzzer for rear parking aid Warning signal Control unit for access and start authorisation J518 Terminal 15 CAN, key number 326_083 Reference For further information on the parking aid control unit J446, please refer to the SSP 312, Audi A3 ’04 – Electrics.

  • Page 61: Door Control Units J386 - J389

    Door control units J386 - J389 The door control units have a similar functionality to those used in the Audi A8 ´03 and are used in the Audi A6 ’05 with appropriately adapted functions and actuation features. The separate installation of the door control unit and the power windows motor is new here.
  • Page 62 Convenience electrics System overview The door control units receive the following input signals: – Power windows switch – Switch for remote unlocking and – Internal locking switch filler flap E204 – Actuating elements for central locking – Child-lock button E318 –...

  • Page 63: Control Units For Seat Adjustment

    Control units for seat adjustment The control units for seat adjustment can be used to set up to 8 individual seat positions for an electrically adjustable seat. The seat positions can be stored in memory and can be set again if necessary using the memory keypad or by entering a radio code.
  • Page 64 Convenience electrics Input and output signals (driver’s seat) Switch for fore-and-aft and height adjustment, driver’s seat E61 Switch for backrest adjustment, driver’s seat E96 Switch for tilt adjustment, driver’s seat E222 Data bus diagnosis interface J533 Control unit for seat adjustment with Door control unit, driver's side J386 steering-column adjustment memory J136...
  • Page 65 Seat symmetry positioning The "Symmetry positioning, driver’s seat/ passenger’s seat" option, which is available in the MMI, can be used to move the passenger’s seat into a symmetrical position in relation to the driver’s seat. The MMI sends a corresponding instruction to the driver’s seat control unit via the CAN Convenience bus.

  • Page 66: Multimedia Interface

    Infotainment Multimedia Interface (MMI) Equipment versions As in the current Audi A8 ’03, the MMI operating Unlike the current Audi A8 ‘03, several versions of concept is now also integrated as standard in the the control unit for the front display unit J523, the new Audi A6 ’05.
  • Page 67 Digital tuner technology will be available in the MMI Basic with the MMI operating concept, a Audi A6 at a later date. Depending on the market in 7" monochrome display (J685) in the dash panel question, a satellite radio receiver or a receiver for...
  • Page 68 Infotainment MMI Basic Plus As an option, the MMI Basic system can be equipped with additional functions in the radio and Reference sound field in the form of a "Plus" version. Please refer to the Driver’s Manual for This includes, for example, a TP Memo function, information on operating the enhanced TP which enables the recording of traffic Memo function!
  • Page 69 MMI Basic Navigation The MMI Basic Plus is available on request with a basic navigation function. For this purpose, a navigation module is integrated into the information control unit J523. Optical route guidance is provided on the central display in the dash panel insert.
  • Page 70 The MMI High comes with the 7" colour display. The standard equipment of the Top system in Reference Audi A6 ‘05 Infotainment includes an RDS dual- Information on the DVD-based navigation tuner, the standard sound system and a 6x CD system can be found in the SSP 293, changer in the glove compartment.
  • Page 71 Function overview and menu structure of the MMI operator system Radio main menu CD/TV main menu Address Book main Telephone main – Dynamic – CD title menu menu transmitter list – TV transmitter – Find entry – Enter PIN – View list –...
  • Page 72 – <Radio source> – Short Guide – Route guidance – Voice operation – <Telephone source*> – Driver’s Manual Start – Factory setting – Audi MMI – <Route map mode> – Z-destination 1...3 Sound – Destination Maintenance – Balance – Fader...

  • Page 73: Antenna Systems

    Antenna systems The antenna system in the new Audi A6 ´05 is The table shows the relevant modules for the integrated as a module in the top area of the rear available vehicle equipment. These are indicated for window, to the left and next to the third brake light, the various, worldwide country versions.

  • Page 74: Control Unit For Front Information J523

    Control unit for front information J523 The control unit for front information J523 is If you order the Audi A6 ´05 with the MMI versions installed in the glove compartment in the standard Basic, Basic Plus or Basic Navigation, the version.
  • Page 75 R50, the antenna for – Output of position data to the CAN bus GPS navigation in the top area of the rear window (e.g. for Audi telematics) (see Chapter Antenna systems). This antenna delivers the GPS signal. If the mobile baseplate was –...
  • Page 76 Infotainment Diagnosis on the control unit for front information J523 Although functional modules are integrated into the The control unit for front information J523 does not control unit for front information J523, the related support the Basic setting and actuator test address words for diagnosis in the VAG tester are functions.
  • Page 77 Overview of the measured-value blocks available for the individual modules Module Designation General measured-value blocks General: Battery positive voltage, terminal status for all modules MOST: Address, MOST FOT temperature, optical lowering Status of ring break diagnosis line Control unit identification: Serial number, flash date, hardware and software version Control unit for front information Multimedia operating unit E380: Status of main buttons, status of knobs/pushbuttons,...
  • Page 78 Equipment: On-board computer Reserved Infotainment control unit holder In the new Audi A6 ’05, the control units responsible for Infotainment are mainly stored in a compact holder behind the left wheel cut-out in the boot. Only the control unit for front information J523 is...

  • Page 79: Sound Systems

    A central subwoofer is not installed in the rear storage area in the Audi A6 ’05 – a standard feature in other model series. The base frequencies, which cannot be localised for...
  • Page 80 6 Low-pitch loudspeaker, front right R23 7 High-pitch loudspeaker, rear left R16 and mid/low-pitch loudspeaker, rear right R160 Reference Information on the functional features of the digital sound system can be please refer to the SSP 293, Audi A8 ´03 – Infotainment.
  • Page 81 Standard sound system diagnosis The diagnosis process is effected via address word 47 as in the case of the series equipment, however, the separate control unit for digital sound system, J525, is now addressed. In addition to reading the measured-value blocks and the fault memory for all loudspeaker channels involved, selective actuator tests are also available.
  • Page 82 Infotainment BOSE sound system The new Audi A6 ´05 comes with a BOSE sound system, which mainly comprises components from the current Audi A8 ‘03. The division of the subwoofer function into two individual subwoofers integrated into the front doors means that the...
  • Page 83 Measured-value block Designation General: Battery positive voltage MOST: MOST address, FOT temperature Status of ring break diagnosis line System: Analogue/digital unit temperatures in amplifier, fan speed Microphone: Microphone voltage(s) for AudioPilot microphone and optical microphone for voice operating system Control unit identification: Manufacturer code Control unit identification: Serial number Available actuator tests Brief description and designation...

  • Page 84: Available Telephone Systems

    Audi A3 ´04. from the current Audi A8 ´03, but which can only be However, it has now been incorporated into the ordered with the High version of the MMI.
  • Page 85 For reasons of electromagnetic mobile baseplate in other model series (Audi A3, A4, compatibility, Bluetooth is only active at present TT), this mobile phone holder no longer has a when the mobile phone is inserted into the relevant connection cable.
  • Page 86 Infotainment Handsfree operation Echo and noise compensation The telephone transmitter and receiver R36 sends The telephone transmitter and receiver R36 is fitted the signals for handsfree operation (Voice, Phone as standard with a DSP-based echo compensation Mute, etc.) via the MOST Infotainment bus to the system.
  • Page 87 Mobile baseplate diagnosis The mobile baseplate is diagnosed as standard using the address word 77 in the VAS tester. A selective or sequential actuator test can be performed to check the output of the audio signal to the relevant sound system, radio mute operation, and whether or not a switched-on phone was detected.
  • Page 88 Infotainment Actuator test The actuator tests listed in the table can be called up using the guided fault-finding function in the diagnosis tester. Most of these can be activated selectively (individually). Possible actuator tests Designation Actuator test Sequential Selective "Phone on" signal Audio lead adapter set Communication lead to adapter set Mobile baseplate adaptation...
  • Page 89 Notes...
  • Page 90 Notes...
  • Page 91 – ESP – Electromechanical parking brake EPB Order No.: A04.5S00.07.00 323_058 SSP 325 Audi A6 ´05 Engines and Gears – 3.0 V6 TDI Common Rail – 3.2 V6 FSI – Manual gearbox 01X, 02X, 0A3 – 6-stage automatic transmission 09L –...
  • Page 92 Vorsprung durch Technik www.audi.co.uk All rights reserved. Subject to technical change. Copyright 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...

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