364 Vorsprung durch Technik www.audi.de Service Training Audi Q7 - Electrical System Self-Study Programme 364 All rights reserved. Technical specifications subject to change without notice. Copyright AUDI AG I/VK-35 Service.training@audi.de Fax +49-841/89-36367 AUDI AG D-85045 Ingolstadt Technical status: 10/05 Printed in Germany A05.5S00.17.
Self-Study Programmes on the Audi Q7 The Audi Q7 stands for 100% premium-quality electronics! SSP 287 - Audi A8 ‘03 Electrical Components There has been an enormous increase of the number of electronic control units over the past few years. The majority of innovations made are only possible thanks to increasingly sophisticated electronics. Without this development, many of the in-car comfort features which today are taken for granted would not be viable.
Contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Fuses and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Installation overview - control units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Control units . . . . . . . . . . . .
Overview Fuses and relays The fuse and electrics boxes Fuse and relay carriers can be found in the following locations in the new Audi Q7: – – – – – Dash panel, left and right adjacent the A-post Engine compartment, rear left Onboard power supply control unit Electronics box under the left seat Luggage compartment, right For details of fuse and relay assignments, please refer to the current service literature.
Overview Installation overview - control units 364_004 Legend 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 6 Garage door operation control unit J530 Adaptive cruise control unit J428 Data bus diagnostic interface J533 Onboard power supply control unit J519 Headlight range control, control unit J431 Tyre pressure monitor control unit J502 Entry and start authorisation control unit J518 Steering column electronics control unit J527 Driver door control unit J386 Rear left door control unit J388 Front passeng
364_005 Legend 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Tailgate control unit J605 Tailgate control unit 2 J756 Reversing camera system control unit J772 Convenience system central control unit 2 J773 Convenience system central control unit J393 Additional heater control unit J364 Aerial reader unit for entry authorisation for keyless entry system J723 Parking aid control unit J446 Trailer detector control unit J345 Adaptive suspension control unit J197 Lane Change Assist control unit J769 Lane Change As
Overview Networking Lane Change Assist control unit 2 J770 Lane Change Assist control unit J769 Control unit with display in dash panel insert J285 Data bus diagnostic interface J533 Engine control unit J623 Parking aid control unit J446 Engine control unit 2 J624 Driver door control unit J386 Energy management control unit J644 Yaw rate sender G202 ABS J104 Front passenger door control unit J387 Additional heater control unit J364 Seat occupied recognition control unit J706 Airbag control u
Mobile telephone operating electronics control unit - J412 Telephone transmitter and receiver unit R36 Front information control unit J523 Telephone handset R37 Navigation system with CD drive control unit - J401 TV tuner R78 Voice input control unit J507 Radio R Mediaplayer in Position 1 R118 MOST bus Digital sound package control unit - J525 Digital radio R147 Dash panel insert CAN bus Tailgate control unit 2 J756 Diagnostics CAN bus Powertrain CAN bus Wiper motor control unit J400 Rain and
Control units Data bus diagnostic interface J533 Modifications to Audi A6 ‘05 The data bus diagnostic interface of the Audi Q7 now has more powerful hardware and a new processor. This was necessary due to the increasing number of messages which are required to be routed between the various bus systems. No functional modifications were made to the diagnostic interface of the Audi A6 ’05. The diagnostic interface with new hardware is also be introduced in the Audi A8 ’03 and A6 ’05 at a later date.
Control unit with display in dash panel insert J285 364_009 Modifications to Audi A6 ‘05 The control unit with display in dash panel insert J285 is already known from the Audi A6 ’05. It was adapted functionally to the new features of the Audi Q7. Unlike the Audi A6 ’05, the Audi Q7 does not have an electro-mechanical parking brake; it is equipped with a foot-operated mechanical handbrake.
Control units Inputs Outputs – – – – – – – – – – – – – Radio controlled clock voltage supply – Terminal 58d (display illumination) – Terminal 58s (switch illumination) Oil pressure switch Oil temperature and oil level sensor Radio controlled clock signal Brake pad/lining wear indicator wire Fuel tank sender 1 and fuel tank sender 2 Washer fluid shortage indicator switch Brake fluid shortage indicator switch Handbrake applied recognition switch Ambient temperature sensor Auto Check button Terminal 30 Te
Onboard power supply control unit J519 The onboard power supply control unit J519 known from the Audi A6 ‘05 and A8 ‘03 is employed in the Audi Q7. Various additional functions were implemented for use in the Audi Q7. Installation location The onboard power supply control unit J519 is installed in the cockpit at the front left on the control unit holder adjacent the steering column. Variants Compared to the new Audi A6 ‘05, only the Midline and Highline variants are installed in the Audi Q7.
Control units Master functions – Exterior light control – Coming home / leaving home – LIN master for J400 - wiper motor control unit – LIN master for G397 - rain and light detector sensor Substitute master function In case of failure of the convenience system central control unit J393, the onboard power supply control unit J519 acts as the substitute master. It sends flash information via the CAN bus.
Battery and energy management The energy management control unit J644 is identical to the control unit already known from the A6 ´05 and A8 ´03. Installation location The energy management control unit J644 is installed below the left-hand seat adjacent the battery case. Seat frame Battery 364_014 Energy management control unit J644 Reference For further information about the energy management system, please refer to Self-Study Programmes SSP 287 and SSP 326.
Control units Evaluating history data The history data contains recorded information about the onboard power supply. Reference For further information, please refer to Self-Study Programme SSP 326. Data records The data can be read out in Guided Fault Finding mode or the Guided Functions mode under "61 - Battery control".
Structure of the data records Static voltage history In the static voltage history, it is possible to read out the following battery voltages: ● 12.5 V ● 12.2 V ● 11.5 V The previous 4 entries, or "time stamps", are displayed. Display on tester Static voltage < 12.5 V : 46 hours Static voltage < 12.2 V : 18 hours Static voltage < 11.
Control units Static current history The previous 10 entries can be read out in the static current history. Display on tester An excessively high static current was measured for a total period of 136 hours. Static current history = 2005-06-27, 11:14:00 * 0001 hours 00.60 A, static current 2005-06-20, 13:36:00 * 0001 hours 00.70 A, static current 2005-06-18, 19:19:00 * 0004 hours 01.00 A, static current 2005-06-10, 14:12:00 * 0002 hours 00.60 A, static current 2005-05-30, 11:47:00 * 0003 hours 00.
Critical energy balance This data record is only written if the vehicle is in an energy critical state (breakdown risk). The data record is written if the energy management control unit recognises the condition "vehicle cannot be started". The most recent data record is displayed at all times. Display on tester This data record is only written if the vehicle is in an energy critical state (breakdown risk). 00.05 A, mean static current 19.75 A, mean total current -10.
Control units Power-down level history The data on the previous 15 power-down levels is entered into the power-down level history. Display on tester Interpreting the data in the power-down level history: Example: 2*2*-12.50*30*2003-10-31-10:10:25*0-0-0-0-0-0*06.5** 2 = power-down level 2 was set 2 = reason for triggering of power-down level (2 = low battery charge) -12.
Battery change history The data from the previous 3 battery changes is stored in the battery change history. The entry in the history data is made when the battery energy management system is encoded. Therefore, it is very important that the energy management control unit J644 only be encoded when a new battery has actually been fitted. Encoding deletes all history data.
Control units Energy balance of the previous 5 standstill periods The energy balance and the duration of the previous 5 standstill periods are recorded. Display on tester - 007.1 Ah, energy balance, standstill period in hours: 034.0 - 009.5 Ah, energy balance, standstill period in hours: 063.6 - 000.4 Ah, energy balance, standstill period in hours: 001.2 - 002.1 Ah, energy balance, standstill period in hours: 003.7 - 010.3 Ah, energy balance, standstill period in hours: 004.
Battery The battery is located below the left-hand seat in order to save space. Direct access to the battery is not necessary for charging and checking the state of charge of the battery. There are two slave start connectors in the engine compartment for charging and external power supply. The battery state is checked using the energy management control unit J644. If it is necessary to replace and check the battery acid level (e.g.
Control units Battery replacement When the vehicle battery is replaced, the energy management control unit J644 must be encoded. This is necessary to adapt the new battery (size, manufacturer, new condition) to the energy management system. Only then will the energy management system function with maximum efficiency and precision. The energy management control unit J644 may only be encoded after a battery is replaced.
Alternator Functional principle of the alternator regulator The current output of the alternator depends on the excitation voltage, and hence the excitation current. Transistor T connects the voltage applied to B+ to the excitation winding at a frequency of approximately 150 Hz. The resultant excitation current IExc or IExc_eff, from 0 A to max. 8 A, is directly proportional to alternator current output.
Control units Close attention is normally given to two operating points. This is firstly the point at 1800 rpm (equivalent to idling speed, green marks) and, secondly, the setpoint at 6000 rpm (red mark). In the case of an 140 A alternator, for example, this value always refers to the setpoint at 6000 rpm. Some nameplates display values such as 75-140 A. The first value denotes the maximum possible current output at 1800 rpm, i.e. 75 A, and the second value corresponds to the setpoint (140 A at 6000 rpm).
Alternator warning lamp The warning lamp indicates a fault in the alternator or a malfunction in the vehicle electrical system. The alternator sends status messages to the energy management control unit J644 via the bit-synchronous interface. These status messages are the basis for the activation of the warning lamp.
Control units Alternator test The following tests are necessary for diagnosis of the regulator: – Rated voltage – Undervoltage – Overvoltage Voltages are ideally measured directly at the alternator connected to B+. If it is not possible to gain access to the measuring point, the voltage can also be measured at the slave start connectors. Rated voltage The alternator regulator must supply at least 14.3 V. Undervoltage The alternator voltage should not be less than 13 V.
Front exterior light Layout of the front lights Turn signals Low beam headlight Main beam Turn signals and side lights Fog light 364_020 Slide system for the headlights By using a slide system, it is possible to remove the headlight without dismantling the bumper. This makes it easier to replace bulbs in the service workshop. For further information on replacing bulbs, please refer to the Audi Q7 Owner's Manual.
Control units Rear exterior light Layout of the rear lights The main rear lights are integrated in the tailgate. Due to the fact that the rear lights also swing upward when the tailgate is opened, additional fixed rear lights are required in the bumper. When the tailgate is opened, the system changes over to the additional rear lights. The brake/tail lights, two for each side of the vehicle and the turn signals, are integrated in the rear lights.
Switch-over of the rear lights Switch-over when opening the tailgate When the tailgate is opened, the brake/tail lights and the turn signals are switched over from the rear lights in the tailgate to the additional rear lights in the bumper. The bulbs in the rear lights in the tailgate are then switched off. If the tailgate is closed again, the system switches back to the rear lights in the tailgate. The additional rear lights in the bumper are again deactivated.
Control units Onboard power supply control unit 2 J520 Modifications to the Audi A6 ‘05 The onboard power supply control unit 2 was adopted from the Audi A6 ’05. The installation location of the control unit is new.
Entry and start authorisation control unit J518 ● with aerial reader unit for entry authorisation for keyless entry system J723 ● Entry and start authorisation switch E415 and ● Entry and start authorisation button E408 Changes to the Audi A6 ‘05 The entry and start authorisation system has basically been adopted from the Audi A6 ‘05.
Control units Variants Depending on the vehicle's target market and the vehicle equipment specification, a variety of demands are placed on the entry and start authorisation system. The resulting type diversity is covered only by different variants of the entry and start authorisation switch E415.
Tasks of the entry and start authorisation control unit J518 ● Represents the system bus connection externally.
Control units Tasks of the entry and start authorisation switch E415 The entry and start authorisation switch E415 is not mechanically encoded. This switch can, therefore, be turned with any A6 key. Key recognition is electronic only.
Tasks of the aerial reader unit for entry authorisation for keyless entry system J723 (The aerial reader unit for entry authorisation for keyless entry system J723 is only available in combination with the optional Advanced Key) ● Evaluating the signals from the four proximity sensors in the doors ● Activating the aerials for entry and start authorisation R134 - R138 ● Communicating with the other components of the entry and start authorisation system via a local single-wire bus 364_028 Aerial reader
Control units Door control units J386 J387 J388 J389 Driver door control unit Front passenger door control unit Rear left door control unit Rear right door control unit Changes to the Audi A6 ´05 The door control units for the Audi Q7 have been adopted from the Audi A6 ’05. This means that the control unit and the window lifter motor are again installed as separate units.
Driver and front passenger seat adjustment control units J136 J521 Seat and steering column adjustment control unit with memory with memory function Seat adjustment control unit with memory, front passenger Changes to Audi A6 05 The seat adjustment control unit and memory has, apart from a few minor modifications, been adopted from the Audi A6 ‘05. The control unit can be installed both as a J136 on the driver's side and as a J521 on the front passenger side.
Control units Functions Electrical manual adjustment In the case of seats with electrical adjustment and memory functions, the manual adjustment switches located in the seat are read by the seat adjustment control unit. The control unit, in turn, drives the 4 adjusting motors and adjusts the seat to the desired position. In the case of seats with electrical adjustment without memory function, no control unit is used. The 4 adjusting motors are controlled directly by the manual adjustment switch.
Saving settings and memory adjustment with Advanced Key The memory adjustment procedure with Advanced Key is identical to the memory adjustment procedure with the remote control key. The only difference is that the vehicle is locked and unlocked with the Advanced Key function.
Control units Convenience system central control unit J393 Changes to Audi A6 ‘05 The convenience system central control unit J393 is based on the control unit in the Audi A6 ‘05. The following modifications have resulted: Due to the introduction of a second convenience system control unit (convenience system central control unit 2 J773), several functions and outputs have been omitted from the convenience system central control unit J393. These are listed in the following.
Outputs – – – – – – – – – – – – – – – – – – – – – Brake and tail lights in bumper, left Brake and tail lights in bumper, outside left Brake and tail lights in bumper, inside left Turn signal in bumper, left Turn signal in tailgate, left Brake and tail lights in bumper, right Brake and tail lights in bumper, outside right Brake and tail lights in bumper, inside right Turn signal in bumper, right Turn signal in tailgate, right Centre brake light License plate light Boot light Footwell lights, rear left Footw
Control units Inputs and outputs on the convenience system central control unit 2 J773 – – – – – – – – Sidemarker, left Sidemarker, right Rear fog light, left Rear fog light, right Reversing light, left Reversing light, right Interior lights LIN bus line to panorama sunroof Installation location The convenience system central control unit J393 is located at the rear right in the vehicle. It is installed in an upright position and attached to a control unit bracket.
Convenience system central control unit 2 J773 The convenience system central control unit 2 J773 is a new control unit and will be used for the first time in the Audi Q7.
Control units Function diagram Terminal 30 Terminal 30 Reversing light, left Rear fog light, left Terminal 31 J773 Reversing light, right Rear fog light, right Interior light Cargo space light / interior light for 3rd seat row LIN open sky system Convenience CAN High Convenience CAN Low Sidemarker, right (North America) Sidemarker, left (North America) G525 Tailgate closed sender 1 G526 Tailgate closed sender 2 364_037 Evaluating the tailgate closed sender The two switches G525 tailgate closed sender 1 a
Emergency function In the event of a fault in switches G525 and G526, the system switches over from the main rear lights in the tailgate to the additional rear lights in the bumper. This action is not indicated in the dash panel insert. In this case, a new attempt to switch on the main rear lights in the tailgate is not made until the next ignition OFF/ON cycle. Switch operating flap Fault memory entries The number of fault memory entries for the lights has been reduced.
Control units open sky system Design The open sky system is a 3-section panoramic glass sunroof. It extends back to the 3rd seat row. The front glass section tilts up and opens electrically. The rear glass section opens electrically. The panoramic sunroof has a full-area sunshade system. The sunshade operates electrically for the front two glass sections and manually and for the rear glass section.
Glass sunroofs 1 and 3 tilted up 364_043 Glass sunroof 1 slid open and glass sunroof 3 tilted up 364_044 49
Control units Sunblind The three glass sections have sunshades for protection against direct sunlight. The front sunshades for glass sections 1 and 2 are operated electrically. The rear sunshade for glass section 3 can be operated manually.
Glass section 1 can be operated using the rotary switch for the sliding sunroof in the front overhead module. Glass section 3 can be operated using the tilt sunroof button 1 E582 in the front overhead module and tilt sunroof button 2 E583 in the rear overhead module operating unit E467. Automatic opening/closing mode is activated by briefly pressing the button. Manual opening/closing mode is activated by holding the button down. The front roof section can be tilted up by pressing the rotary switch.
Control units Initialisation The initialisation for the open sky system's motors will be lost if the power supply to the motors or control units is disconnected when the convenience CAN bus is awake. For instance, the initialisation for motor V1 will be lost if the convenience CAN bus is not in Sleep mode and the power supply to this motor is disconnected.
Deactivation of control switches If a switch is pressed for longer than 60 seconds, it will be deactivated in the direction it is set. If the switch is pressed for longer than 60 seconds in "OPEN" direction, the "OPEN" function will be deactivated. The deactivation can be cancelled by means of an ignition OFF/ON cycle. Anti-pinch protection feature All 3 motors have an anti-pinch protection feature which is enabled over the full closing distance of the window.
Control units Trailer detector control unit J345 In addition to activating the trailer lights, the trailer detector control unit J345 controls the electric swivelling tow attachment. The electric swivelling tow attachment known from group vehicles can also be retrofitted. In this case, it is installed as a unit behind the bumper. Installation location The trailer detector control unit J345 is installed in the cargo space on the right under the load floor.
Variants The following tow attachments are available for the Audi Q7: ● Mechanical tow attachment, removable tow attachment ball head ● Electric tow attachment, electric swivelling tow attachment ball head Operation The electric swivelling tow attachment can be swivelled out manually or automatically. The operating unit consists of a rocker in the right side trim in the luggage compartment. The rocker has a red locating light and a yellow function light.
Control units Mode of operation The swivel-out operation is executed by the hinged tow attachment ball head motor V317 and monitored by the trailer detector control unit J345. If the tow attachment comes collides with an obstacle while swivelling out, the swivel-out operation is stopped. To detect collisions, the control unit monitors the power consumption of the hinged tow attachment ball head motor V317. The swivel-out operation can be continued by pressing the button continuously.
"ON" conditions The swivelling tow attachment ball head can only be extended or retracted under the following conditions: – Vehicle must be stationary – Tailgate must be open – Button E474 must be operated – No trailer attached "OFF" conditions The swivelling movement may be stopped under the following conditions: – Anti-pinch protection – By altering the supply voltage, i.e.
Tailgate control unit J605 and tailgate control unit 2 J756 364_053 Changes to Audi A6 ‘05 The tailgate control units and drives J605 and J756 have been adopted from the Audi A6 Avant. The software was adapted to the Audi Q7 tailgate, which, for example, has a different opening angle than the Audi A6 Avant tailgate. The tailgate control operating concept is identical to that described in SSP 344.
Self-Study Programmes on the Audi Q7 The Audi Q7 stands for 100% premium-quality electronics! SSP 287 - Audi A8 ‘03 Electrical Components There has been an enormous increase of the number of electronic control units over the past few years. The majority of innovations made are only possible thanks to increasingly sophisticated electronics. Without this development, many of the in-car comfort features which today are taken for granted would not be viable.
364 Vorsprung durch Technik www.audi.de Service Training Audi Q7 - Electrical System Self-Study Programme 364 All rights reserved. Technical specifications subject to change without notice. Copyright AUDI AG I/VK-35 Service.training@audi.de Fax +49-841/89-36367 AUDI AG D-85045 Ingolstadt Technical status: 10/05 Printed in Germany A05.5S00.17.
