Service TrainingAudi Q7 - Electrical SystemSelf-Study Programme 364The Audi Q7 stands for 100% premium-quality electronics!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. To keep pace with the increasing complexity of new vehicles, continuous learning is essential. The Self-Study Programmes by AUDI are an efficient advanced learning tool as they enable you keep abreast of technical developments.To be able to offer customers with this diversity of functions and equipment options, a multiplicity of different electronic control units are required in the Audi Q7. The control units do not work separately as independent nodes, rather they are interconnected via efficient bus systems. Depending on the quantity of data to be exchanged, the MOST bus, an optical data bus, a CAN bus or a LIN bus is utilised. Data is also exchanged across the various bus systems. A separate control unit provides the interface between the various systems. Each control unit is therefore supplied efficiently with the information and vehicle operating variables which its requires for optimal functioning.364_006Self-Study Programme 364 introduces you to the network topology of the Audi Q7, and provides you with an overview of the positions in the vehicle in which electrical components are located. In addition to obtaining service-related information on the control units, you will learn the installation location of each control unit and become familiar with its tasks. You quickly and efficiently gain an insight into the electronics in the Audi Q7.364_029Into the lead: With design & performanceContentsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Fuses and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Installation overview - control units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Data bus diagnostic interface J533 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control unit with display in dash panel insert J285 . . . . . . . . . . . . . . . Onboard power supply control unit J519 . . . . . . . . . . . . . . . . . . . . . . . Battery and energy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alternator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front exterior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear exterior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Onboard power supply control unit 2 J520 . . . . . . . . . . . . . . . . . . . . . . Entry and start authorisation control unit J518. . . . . . . . . . . . . . . . . . . Door control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Seat adjustment control units on driver and front passenger sides J136 and J521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Convenience system central control unit J393 . . . . . . . . . . . . . . . . . . . Convenience system central control unit 2 J773 . . . . . . . . . . . . . . . . . open sky system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trailer detector control unit J345 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear lid control unit J605 and rear lid control unit 2 J756. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 . 11 . 13 . 15 . 23 . 25 . 29 . 30 . 32 . 33 . 38 . 39 . 42 . 45 . 48 . 54. . . . . . . . 58This self-study programme teaches the design and function of new vehicle models, new automotive components or new technologies. The self-study programme is not a workshop manual! All values given are intended as a guideline only, and refer to the software variant valid at the time of publication of the SSP. Please refer to the relevant Service Literature for current inspection, adjustment and repair instructions.ReferenceNoteOverviewFuses and relaysThe fuse and electrics boxesFuse 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, rightFor details of fuse and relay assignments, please refer to the current service literature.361_09445OverviewInstallation overview - control units364_004Legend 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 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 passenger door control unit J387 Rear right door control unit J389 Energy management control unit J644 Airbag control unit J234 Onboard power supply control unit 2 J520 Seat adjustment control unit with memory, front passenger J521 Battery A6364_005Legend 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 Assist control unit 2 J770 Reversing camera R189 Radio controlled clock receiver J4897OverviewNetworkingLane Change Assist control unit 2 J770Control unit with display in dash panel insert J285Lane Change Assist control unit J769Adaptive cruise control unit J428Engine control unit J623Parking aid control unit J446Data bus diagnostic interface J533Engine control unit 2 J624Driver door control unit J386Energy management control unit J644Yaw rate sender G202ABS J104Front passenger door control unit J387Additional heater control unit J364Seat occupied recognition control unit J706Airbag control unit J234Rear left door control unit J388Tailgate control unit J605Automatic gearbox control unit J217 Power output module for left headlight J667 Power output module for right headlight J668Rear right door control unit J389 Seat and steering column adjustment control unit with memory J136 Seat adjustment control unit with memory, front passenger - J521Onboard power supply control unit J519Headlight range control, control unit - J431Onboard power supply control unit 2 - J520Adaptive suspension control unit J197Entry and start authorisation control unit - J518Comfort system central control unit 2 - J773Convenience system central control unit J393Steering angle sender G85 Steering column electronics control unit - J527Trailer detector control unit J345Tyre pressure monitor control unit - J502Climatronic control unit J255Multi-function steering wheel control unit - J453Reversing camera system J772Rear Climatronic operating and display unit E2658Mobile telephone operating electronics control unit - J412 Telephone transmitter and receiver unit R36 Telephone handset R37Front information control unit J523Navigation system with CD drive control unit - J401TV tuner R78Radio RVoice input control unit J507 Mediaplayer in Position 1 R118 Digital sound package control unit - J525MOST busDigital radio R147Dash panel insert CAN bus Diagnostics CAN bus Powertrain CAN busTailgate control unit 2 J756Wiper motor control unit J400Rain and light detector sensor G397Convenience CAN bus CAN Extended LIN bus Various subbus systemsSliding sunroof control unit J245Sunroof roller blind control unit J394Rear sliding sunroof control unit J392Entry and start authorisation switch E415Aerial reader unit for entry authorisation for keyless entry system - J723Interior monitoring sensor G273Alarm horn H12Sender unit, front left G431Sender unit, front right G432Sender unit, rear left G433Sender unit, rear right G434Rear tyre pressure monitor aerial R96364_0069Control unitsData bus diagnostic interface J533Modifications to Audi A6 ‘05The 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.Master functions● ● ● ●Terminal 15 - powertrain CAN bus run-on Sleep and wake-up of the data bus systems Optical fibre break diagnostics of the MOST-Bus Installation list364_007VariantsThe data bus diagnostic interface is available in two variants for the Audi Q7. The part numbers differ from one another only in respect of the index. The difference between the two variants is the availability of a CAN Extended connection. This connection is required if ACC or Lane Change Assist is installed in the vehicle.Installation locationThe data bus diagnostic interface J533 is located on the left behind the dash panel insert and is attached to a mounting bracket.364_00810Control unit with display in dash panel insert J285364_009Modifications to Audi A6 ‘05The 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. A switch, which is read by the control unit with display in dash panel insert J285, is attached to the operating lever. When the switch is actuated, earth is connected and the corresponding warning lamp is activated in the dash panel insert. A new feature in the dash panel insert is the air spring suspension level indicator. This indicator is activated in the centre display as soon as an automatic level change is performed. This is the case, for example, if the system exits "lift" mode because a speed threshold has been exceeded; the suspension height will then be lowered. The level indicator can, however, be activated continuously by the driver by clicking the onboard computer to the corresponding level with the Reset key.A further new feature was implemented in the onboard computer. The driver has the option of displaying the vehicle's current speed digitally. This is done by setting the onboard computer setting the onboard computer to the corresponding level with the Reset key. On this level, the onboard computer variables can still be retrieved in the case of a colour dash panel insert. The two diagrams show the vehicle speed display in a colour dash panel insert and in a monochrome dash panel insert.364_010364_01111Control unitsInputs– – – – – – – – – – – – 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 Terminal 31Outputs– Radio controlled clock voltage supply – Terminal 58d (display illumination) – Terminal 58s (switch illumination)VariantsThe Audi Q7 comes with three different dash panel insert variants. A monochrome dash panel insert is standard equipment, but a dash panel insert with colour display is also available. In the case of the dash panel insert with colour display, a distinction must be made between vehicle with or without ACC function.Inputs and outputs– CAN bus lines of the dash panel insert CAN – Wake-up line between diagnostic interface and dash panel insert for mutual wake-up at "terminal 15 OFF"364_01212Onboard power supply control unit J519The 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 locationThe onboard power supply control unit J519 is installed in the cockpit at the front left on the control unit holder adjacent the steering column.VariantsCompared to the new Audi A6 ‘05, only the Midline and Highline variants are installed in the Audi Q7. This is necessary because a rear window wiper is always installed in the Audi Q7. In the Midline variant or higher, the onboard power supply control unit drives the windscreen and rear window washer pump V59. The Highline variant is required in combination with the electrical steering column adjustment.364_013Reference For further information about the onboard power supply control unit, please refer to Self-Study Programmes SSP 287, SSP 288 and SSP 326.13Control unitsMaster functions – Exterior light control – Coming home / leaving home – LIN master for J400 - wiper motor control unit – LIN master for G397 - rain and light detector sensorSubstitute 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.Other functions – Voltage-encoded read-in of the rotary light switch – Activation of the side lights warning lamp in the rotary light switch – Electrical steering column adjustment – Activation of the driver and front passenger footlights. The type of lighting, LED or conventional bulb can be encoded in the onboard power supply control unit. – Activation of the shift gate lighting – Activation of the daytime driving lights – Activation of the front and side turn signals – Activation of the signal horn – Activation of the windscreen and rear window washer pump V59 – Activation of the headlight washer system – Activation of the rear window wiper motor V12 – Steering column adjustment memory – Easy entry steering column adjustmentEmergency functions If a fault is found in the rotary light switch or an open circuit in the wire to the rotary light switch, the onboard power supply control unit automatically activates the light continuously. If a fault has occurred in the light control, the light is activated continuously by the onboard power supply control unit J519.14Battery and energy managementThe energy management control unit J644 is identical to the control unit already known from the A6 ´05 and A8 ´03.Installation locationThe energy management control unit J644 is installed below the left-hand seat adjacent the battery case.Seat frame Battery364_014 Energy management control unit J644Reference For further information about the energy management system, please refer to Self-Study Programmes SSP 287 and SSP 326.Express static current measurementA so-called express static current measurement can be made in the Guided Fault Finding mode or the Guided Functions mode under "61 - Battery control - Static current measurement using J644 - energy management control unit" . The energy management system measures the actual static current in approx. 15 minutes. If the static current is too high, a faultfinding program can be started directly from this program.15Control unitsEvaluating history dataThe history data contains recorded information about the onboard power supply.Reference For further information, please refer to Self-Study Programme SSP 326.Data recordsThe data can be read out in Guided Fault Finding mode or the Guided Functions mode under "61 - Battery control". The following data records are available: – Static voltage history – Static current history – Critical energy balance – Power-down level history – Battery change history – Energy balance of the previous 5 trips – Energy balance of the previous 5 standstill periods – Date/clock time programming in the dash panel insertGuided Fault Finding Function/component selection Select function or component Electrical system (Rep. Gr. 01; 90 - 97) 01 - Systems with self-diagnostic capability 61 - Battery control J644 - Energy management control unit, functions A - Battery, state of charge A - Battery, battery test J644 - Energy management, general description J644 - Energy management control unit, encoding J644 - Read history data J644 - Energy management, read data blocks J644 - Energy management, interrogate fault memory J644 - Final control tests, alternator voltage J644 - Replace control unit J644 - Energy manager, activate/deactivate Transport mode AUDI Audi A6 2005 2005 (5) Saloon BBJ 3.0l Motronic / 160 kW326_12316Structure of the data recordsStatic 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 VThe previous 4 entries, or "time stamps", are displayed.Display on testerStatic voltage 12.5 V : 46 hours Static voltage 12.2 V : 18 hours Static voltage 11.5 V : 9 hours Static voltage history (raw data) = 2005-06-28, 10:12:00 * 0005 * 001 ** 2005-06-14, 12:45:00 * 0001 * 001 ** 2005-05-24, 10:26:00 * 0004 * 001 ** 2005-05-17, 11:08:00 * 0002 * 001 * 00046 *** 2005-06-24, 11:12:00 * 0004 * 001 ** 2005-05-16, 10:36:00 * 0002 * 001 ** 2005-04-20, 12:56:00 * 0003 * 001 ** 2005-04-12. 16:03:00 * 0002 * 001 * 00018 *** 2005-06-28, 10:12:00 * 0002 * 001 ** 2005-06-17, 18:49:00 * 0003 * 001 ** 2005-05-20, 11:16:00 * 0001 * 001 ** 2005-04-22, 13:18:00 * 0001 * 001 * 00009 *** Previous four values for static voltage 12.5 V The most recent value is listed first Display of the complete voltage undershoot for each voltage thresholdThe previous four values for static voltage 12.2 V The most recent value is listed firstPrevious four values for static voltage 11.5 V The most recent value is listed firstStructure of the data record 2005-06-28 , 10:12:00 * 0052005-06-28 10:12:00 005 001 0012 Date: year, month, day Time: hours, minutes, seconds Time in hours which the actual voltage is below the set voltage, e.g. 12.5 V Battery number Total time in hours which the actual voltage is below the set value. Only specified for fourth value. The total may be larger than the total of the previous 4 entries, because all deviations below the voltage threshold are counted for the battery which is fitted.* 001* 0012**Time stampProlonged deviations below 12.2 V and 11.5 V are particularly critical. If the battery voltage is below these threshold values, the battery will not be able to regenerate. This can result in damage to the battery after a lengthy standstill period. If lengthy deviations below 12.2 V and 11.5 V are ascertained, the battery must be tested. The data are recorded under the following test conditions : – Terminal 15 OFF for at least 2 hours – Convenience CAN bus in Sleep mode – Power consumption less than 100 mA17Control unitsStatic current history The previous 10 entries can be read out in the static current history.Display on testerAn 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 00.70 A, static current 2005-05-29, 12:03:00 * 0002 hours 01.20 A, static current 2005-05-21, 10:59:00 * 0005 hours 00.80 A, static current 2005-05-14, 16:52:00 * 0001 hours 01.00 A, static current 2005-04-20, 11:28:00 * 0004 hours 00.60 A, static current 2005-04-18, 10:07:00 * 0002 hours 00.70 A, static currentThe previous 10 entries are displayed.An excessively high static current was measured for a total period of 136 hours. Total duration with excessively high static current. The total may be larger than the total of the previous 10 entries, because all are counted for the battery which is fitted. This entry is not required for the analysis. The evaluation of the previous 10 entries is important.2005-06-27 , 11:14:00 * 00 hours2005-06-27 11:14:00 00 hours 00, 60 A, static current Date: year, month, day00, 60 A, static currentTime stampTime: hours, minutes, seconds Time in hours which the actual voltage is below the set voltage, e.g. 12.5 V Battery numberThe evaluation of prolonged deviations above the static current is important. If 0 or 1 is displayed for the duration the deviation above the set value, this means that the duration of the deviation above the set value was less than or equal to one hour. Such entries can be disregarded because they are caused, among other things, by the "TP memory function". If the value 0 is displayed for the static current, these are short current peaks which can be disregarded. High static currents can be caused by: – the customer - if electrical consumers such as power supplies or vehicle fridges are connected to the cigarette lighter supplied via terminal 30. – the vehicle - in the event of a fault. If the vehicle is required to have a high static current due to an awake bus system, no entry is made in the history data under "Static current history" due to non-compliance with the test conditions (convenience CAN bus must be in Sleep mode). Test conditions are: – Terminal 15 OFF for at least 2 hours – Convenience CAN bus in Sleep mode – Power consumption greater than 50 mA The 50 mA current threshold consists of the following components: – 25 mA max. permissible static current – 25 mA for possible charging of the anti-theft alarm sounder When a test is made using express static current measurement, 70 mA is output as the maximum permissible static current. The difference can be attributed to an additional tolerance of 20 mA.18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 testerThis 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 -10.73 A, current at time of history data entry 17 %, battery state of charge 03 Mohms, internal resistance of the battery +0118 Ah, energy throughput -00067 Ah, energy balance 009624 km, mileage 2005-06-13, 23:24:47 time and date Hazard warning OFF Side lights OFF Low beam headlight OFF Fog light OFF Main beam OFF 07.1 hours, terminal 15 ON 07.1 hours, data bus awake 007.1 hours, previous standstill period 00 number of data bus ON/OFF cycles 01 number of terminal 15 ON/OFF cycles 01 number of breakdown entries in history database 002 number of fitted (replaced) batteries in vehicleLight statusVehicle statusThe data record is output together with the information in alphanumeric text. This simplifies evaluation.Display on tester if no danger of breakdown risk existedNo entry exists. The vehicle is not in an energy critical state.The "mean total current" is the value of "Engine OFF" up to the "limit of startability". It therefore gives the average electrical current until an entry was made. The "current up to time of history data entry" gives the electrical current at the moment of entry or at the moment of breakdown risk recognition. The "battery state of charge" is recorded at the moment of triggering. The "battery internal resistance" is recorded at the moment of triggering. The battery should internal resistance of less than approx. 10 Mohms at al times. If the internal resistance is greater than this, the battery should be checked. Please note that the internal resistance increases rapidly after the state of charge drops to 15-20 %. In the case of a fully discharged battery, values up to 99 Mohms may be indicated. With regard to the energy throughput, it should be considered that a battery can deliver approx. 60 x of its rated capacitance over its useful life. The energy balance is the battery's "account". If more current flows away from the battery than to the battery, the value is negative. If the battery is fully charged, a 0 is displayed as the energy balance. As this value is produced by current integration only, it loses significance with increasing battery age. From the status of the lights and the vehicle, it can be ascertained whether an electrical consumer or the ignition was "on" at the moment of recording, i.e. at the time of breakdown risk. The "number of breakdown entries" indicates how often the energy management control unit has ascertained an energy-critical balance which could lead to starting problems. Generally, the history data must be read out rapidly in cases of complaint. If a new "breakdown risk" is triggered by frequent ignition on/off cycles or short manoeuvres, the previous critical energy balance data will be overwritten by the new data. This means that the data at the time of complaint is overwritten and therefore lost, which, in turn, can complicate the problem handling process.19Control unitsPower-down level history The data on the previous 15 power-down levels is entered into the power-down level history.Display on testerInterpreting 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) -12.50 = mean total discharge current in A during the set power-down level 30 = battery state of batches (SOC = state of charge) 2003-10-31 = date 10:10:25 = time 0 = hazard warning lights OFF (1 = hazard warning lights ON) 0 = parking lights OFF (1 = parking lights ON) 0 = side lights OFF (1 = side lights ON) 0 = low beam headlights OFF (1 = low beam headlights ON) 0 = fog lights OFF (1 = fog lights ON) 0 = main beam OFF (1 = main beam ON) 06.5 = terminal 15 "on" time in hours (engine was OFF during this period) Power-down level history = 2*0*-04.57*77*2005-06-23, 14:02:19*0-0-0-0-0-0*03.1** . . . 5*2*-10.76*21*2005-06-11. 10:38:45*0-0-0-0-0-0*06.7** The previous 15 entries are displayed.The data record is output together with the information in alphanumeric text. This simplifies evaluation.Reasons for triggering 0 = electrical current related 1 = battery charge too low and/or battery internal resistance too high and/or capacitance loss Qv too high 2 = starting-critical battery voltage at present discharge current 3 = 1 and 2 simultaneously 4 = state of charge 30% 5 = 1 and 4 simultaneously 6 = 2 and 4 simultaneously 7 = 1, 2 and 4 simultaneouslyPower-down levels are also registered in the fault memory. The difference to the history data is that the initial activation of a power-down level is recorded in the fault memory in the new Audi A6 ‘05 and A8 ‘03. In the Audi Q7, only the note "Energy management system active" is entered when any power-down level is set. The most recent value is always output in the history data.20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. In this case, it will not be possible to perform, among other things, a reliable battery test using the VAS 5051, because this test utilises the history data. Likewise, it will be very difficult for Audi AG to comment upon queries submitted through DISS, because the history data is no longer available or is falsified.Display on testerThe battery change history contains no more than 3 lines of data. An evaluation of the data produced the following results: Original battery serial number: 1401270070 2005-06-24, 12:03:17 time and date of removal of the battery. -00050 Ah, energy balance of the removed battery -240 Ah, energy throughput of the removed batteryAdditional data The following information can be read out with the "Additional data" button: – Energy balance of the previous 5 trips – Energy balance of the previous 5 standstill periods – Time programming in the dash panel insertEnergy balance of the previous 5 trips The energy balance and the duration of the previous 5 trips are recorded.Display on testerEnergy balance of the previous 5 trips = +003.5 Ah, energy balance, trip duration in hours 000.7 +010.3 Ah, energy balance, trip duration in hours 002.3 +008.2 Ah, energy balance, trip duration in hours 001.2 +003.5 Ah, energy balance, trip duration in hours 000.5 +001.3 Ah, energy balance, trip duration in hours 001.2Negative energy balances mean that the battery was discharged during the trip! Causes: – driving short distances – many electrical consumers – low battery charge In Audi vehicles, the alternators are always designed in such a way that discharge of the battery while driving can only occur in very unfavourable operating situations. This means that the alternator must be tested for proper function if the energy balance is negative for a prolonged period of time.21Control unitsEnergy 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: 004.3A negative energy balance means that a number of electrical consumers were still active after the engine was shut off. This data is very useful if there is no data in the static current history. It is possible to ascertain whether the battery was loaded or discharged after the engine was shut off.Data for date/time programming in the dash panel insertDisplay on testerData for date/time programming in the dash panel insert: The data record indicates when, and how often the date/time display in the dash panel insert was changed. In addition, it is possible to check whether the time has been set correctly in vehicles without a radio-controlled clock.Number of date/time resets in the dash panel insert: 15 Each successive line consists of a time stamp pair. The first time stamp of the pair shows the time in the dash panel insert prior to the reset. The second time stamp shows the adjusted time after the reset.Causes of a reset are: 1st cause: battery was disconnected 2nd cause: low battery voltage 2005-06-29, 16:12:00*2005-06-30, 13:00:00 2005-05-01, 13:09:20*2005-05-01, 16:30:00 2005-04-03, 10:22:14*2005-04-03, 12:13:00 2005-02-11. 11:34:00*2005-02-13, 14:05:00 2005-02-01, 12:54:00*2005-02-01, 13:30:00This data can be used to validate the time of reset. The most recent value is always found on the top line in the history data. The energy management control unit J644 always writes the time and date along with the current value. The time and date are made available by the dash panel insert on the data bus system. If the time and date settings are incorrect, an old date will possibly be written along with a new entry.22BatteryThe 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. during routine service work), the seat can be easily folded up after undoing two screws.The following batteries are used:● ● ●80 Ah / 380 A 95 Ah / 450 A 110 Ah / 520 AThe choice of battery depends on: – Engine – Equipment – CountryBattery testA battery test can be performed using the energy management control unit J644. This test can be started in the Guided Fault Finding mode or the Guided Functions mode under "61-Battery control - A-Battery, test". The energy management control unit calculates from various measured values and the history data the state of the battery and displays the following as a possible result: – Battery OK – Charge battery – Replace batteryIn the case of the Audi Q7, it is no longer necessary to test the battery using battery tester VAS 5097A. The advantages of this new test method are: – It is not necessary to charge the battery prior to the test. – It is not necessary to disconnect the battery from the onboard power supply. – It is not necessary to remove the battery. The battery acid level can be checked visually in the usual way.23Control unitsBattery replacementWhen 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. Otherwise, faults will be produced in the vehicle due to incorrect assessment of the battery state and loss of important history data, which is required, among other things for testing the battery with the VAS tester.Trickle chargeTo conserve battery power in showroom vehicles and vehicles in the workshop, a VAS 5095A, VAS 5900 or VAS 5903 charger must be connected to the designated slave start connector in the engine compartment on the left-hand side. This will prevent exhaustive discharging of the battery.364_016 Slave start connector Positive Slave start connector NegativeDisconnecting the vehicle batteryTo disconnect the earth wire of the vehicle battery, it is not necessary to fold up the seat. The battery's earth wire of the battery can, when necessary, be disconnected at the earth connector in front of the left-hand seat.Cover in front of left-hand seatEarth connector364_017364_01824AlternatorFunctional principle of the alternator regulatorThe 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.IExc_eff IExc364_056UErr = UExc IErr = IExc364_057Alternator characteristicThe diagram gives a qualitative overview of the relationship between speed and current output under full alternator load, i.e. the characteristic curve gives the maximum possible current output for each speed.364_06125Control unitsClose 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).Notes - The characteristic data always refers to operation at room temperature. - In this context, "speed" means alternator speed, and not the engine speed.The following alternators are used in the Audi Q7:Manufacturer Valeo Valeo HitachiAlternator data 100-150 A 105-180 A 140-210 AAlternator type TG16 TG17 HTC 190AI_max @ 1800 rpm 100A 105A 140AI_max @ 6000 rpm 150A 180A 210A26Alternator warning lampThe 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. The information for activating the warning lamp is sent to the convenience CAN bus by the energy management control unit J644 and relayed to the dash panel insert CAN bus via the data bus diagnostic interface (gateway) J533. The control unit with display in dash panel insert J285 reads this information from the dash panel insert CAN and activates the warning lamp.The warning lamp is activated if any of the following faults occur: – The engine is running and a mechanical fault is present in the alternator for at least 10 seconds. – An electrical fault is present in the alternator or at the bit-synchronous interface for at least 10 seconds. Both faults trigger entries into the energy management control unit J644.The warning lamp is not activated: – No communication between the energy management control unit J644 and the control unit with display in dash panel insert J285.Control unit with display in dash panel insert J285Dash panel insert CAN busData bus diagnostic interface J533 Convenience CAN busEnergy management control unit J644Alternator364_059The alternator or the regulator in the alternator can send 3 fault messages via the bit-synchronous interface to the energy management control unit: – Mechanical faults – Electrical fault – High-temperature faultNote Important! If the regulator is faulty, it is possible that the alternator warning lamp is not being activated. This is the case if a fault in the regulator is preventing information from being sent to the bit-synchronous interface. As a result, the energy management control unit J644 does not receive any information on the activation of the warning lamp.27Control unitsAlternator testThe following tests are necessary for diagnosis of the regulator: – Rated voltage – Undervoltage – OvervoltageVoltages 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. 13 V are still allowable at low speed and when electrical consumers are active. Overvoltage The alternator voltage must not exceed 15.5 V at high speed and when few electrical consumers are active.The following are indications of a faulty diode in the alternator: – Alternator makes loud noise. – Very high ripple content when measuring harmonic content with the DSO.28Front exterior lightLayout of the front lightsTurn signalsLow beam headlightMain beamTurn signals and side lightsFog light364_020Slide system for the headlightsBy 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.Unlocking364_062364_063The headlight can be pulled out to the front after unlocking and disconnecting the electrical wiring. Please follow the instructions in the current workshop manual.Replacing the bulbsAlmost all bulbs can be replaced using the vehicle's tool kit. For further information on replacing bulbs, please refer to the Audi Q7 Owner's Manual. The following cannot be replaced by the customer: Xenon lamps, turn signal lamps in the mirrors, highlevel brake light.364_06429Control unitsRear exterior lightLayout of the rear lightsThe 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. The additional brake/tail lights and the additional turn signals are integrated in the additional rear lights in the bumper.The reversing lights and the rear fog lights are also integrated in the bumper.Brake/tail lightBrake/tail lightTurn signalTurn signal Rear fog lightBrake/tail lightReversing light364_021VariantsThe rear lights are available in country-specific variants:● ●ECE (e.g. Europe) SAE (e.g. North America)Activation of the rear lightsActivation by convenience system central control unit J393 – Brake lights – Tail light – Turn signals Activation by convenience system central control unit 2 J773 – Rear fog light – Reversing light – Side brand (North America)30Switch-over of the rear lightsSwitch-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.Switch-over in case of failure of lamps In the case of failure of the turn signal on one side of the vehicle or failure of both lamps for the combined tail lights/brake lights, the system switches over asymmetrically to the lights in the bumper. This means that the system switches over only to the faulty side of the vehicle. If an asymmetric switch-over is made, this is indicated in the dash panel insert. In the case of a switch-over due to the failure of the main rear lights to the additional rear lights in the bumper, the next attempt to switch on the rear lights in the tailgate is made in conjunction with the next terminal 15 cycle.364_022Rear light switch-over sequenceThe convenience system central control unit J393 receives sensor information from the convenience system central control unit 2 J773 for switching over the lights when opening the tailgate. Tailgate closed sender 1 G525 and tailgate closed sender 2 G526 are connected to the convenience system central control unit 2 J773. If the convenience system central control unit 2 J773 receives the information "tailgate open", this information will be relayed to the convenience system central control unit J393 via the convenience CAN bus. The convenience system central control unit J393 thereupon switches over from the rear light in the tailgate to the additional rear lights in the bumper. You will find information on senders G525 and G526 in the section on convenience system central control unit 2 J773 in this self-study programme. The convenience system central control unit is equipped with a cold and hot lamp monitoring system. This enables it to detect the failure of the brake/tail lights and turn signals. If the failure of a lamp is detected on one side of the vehicle, the system, switches over to the additional rear light.Replacing the lampsAll lamps can be replaced using the vehicle's tool kit. The lamps can be accessed through 4 covers in the tailgate.31Control unitsOnboard power supply control unit 2 J520Modifications to the Audi A6 ‘05The onboard power supply control unit 2 was adopted from the Audi A6 ’05. The installation location of the control unit is new.Functions● ● ● ●Reading in the glove box button E316 Activation of the glove box release motor V327 Activation of the servotronic solenoid valve N119 Provides the information on road speed signal, convenience opening and convenience locking to the sliding sunroof via one discrete line Transfers the measured values from the tilt-angle sensor integrated in the control unit to the CAN bus364_023●VariantsThere are two variants of the onboard power supply control unit 2 J520. The basis variant has the functions of the glove box release and activates the servotronic solenoid valve. The Highline variant additionally has the functions of the sliding sunroof and a tilt sensor in the control unit. The measured values of the tilt sensor are required for the anti-theft alarm system.Installation locationOnboard power supply control unit 2 is, as shown in the illustration, located below the right-hand front seat.364_02432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 E408Changes to the Audi A6 ‘05The entry and start authorisation system has basically been adopted from the Audi A6 ‘05. The following changes have been made compared to the Audi A6 ’05: The installation location of the aerial reader unit for entry authorisation for keyless entry system J723 was changed. In the Audi Q7 it is located at the rear right. The exact installation location is shown in the relevant section.System overviewThree components of the entry and start authorisation system communicate with each other via a local single-wire bus. These are: – the entry and start authorisation control unit J518 – the entry and start authorisation switch E415 and – the aerial reader unit for entry authorisation for keyless entry system J723 (is only installed in combination with Advanced Key)Entry and start authorisation control unit J518 The aerial reader unit for entry authorisation for keyless entry system J723Entry and start authorisation switch E415 364_025The entry and start authorisation control unit J518 is the system master and represents the interface externally. The entry and start authorisation control unit J518 is a convenience CAN bus user.33Control unitsVariantsDepending 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. The switch variant is determined by the following vehicle characteristics:● ● ●with or without Advanced Key with automatic or manual gearbox (due to ignition key withdrawal lock) radio frequency of the ignition key (315 MHz, 433 MHz or 868 MHz)The entry and start authorisation control unit J518 as well as the aerial reader unit for entry authorisation for keyless entry system J723 are available in one variant only.Reference The entry and start authorisation system is described in SSP 326 Audi A6 ‘05 Electrical System.34Tasks of the entry and start authorisation control unit J518● ●Represents the system bus connection externally. Is a convenience CAN bus user Communicates with the other components of the entry and start authorisation system via a local single-wire bus Reads the position of the ignition key in the entry and start authorisation switch E415 via 2 discrete lines and the single-wire bus Reads the position of the entry and start authorisation button E408 (is only installed in combination with Advanced Key) Activates the terminal relay for terminal 15 and for terminal 75x● ● ●Requests the engine control unit to start the engine Activates the steering column locking and unlocking motor Queries the automatic gearbox control unit J217 to determine whether the selector lever is currently engaged in the P or N position. Enables "vehicle opening" Is the diagnostic interface for all components of the entry and start authorisation system Acts as the master for the immobiliser IV vehicle function●● ● ●●●364_026The entry and start authorisation control unit and the steering column form a single unit, as in the Audi A6 ‘05. The control unit is attached to the steering column by tear-off screws, and cannot be replaced separately. If it is necessary to replace the entry and start authorisation control unit, the steering column must also be replaced.35Control unitsTasks of the entry and start authorisation switch E415The 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.364_027● ●Evaluating the key position in the ignition switch with 4 microswitches Transferring the current ignition key position via single-wire bus and via 2 discrete lines to the entry and start authorisation control unit For safety reasons, the entry and start authorisation switch has an additional disconnect for the power supply to the steering column lock (to prevent automatic locking) Reading the gear selector position P switch F305 (only in vehicles with automatic gearbox) Controlling the integrated ignition key withdrawal lock Reading the entry and start authorisation button E408 (only in vehicles with Advanced Key)● ●Reading the signal from the central locking and anti-theft alarm system aerial R47 Relaying data received from the remote control key to the entry and start authorisation control unit Reading the signal from brake light switch F (only in vehicles with Advanced Key) Transmitting power via a reader coil to the inserted ignition key so that it can send its key ID Transmitting the received key ID via the singlewire bus to the entry and start authorisation control unit J518 Communicating with the other components of the entry and start authorisation system via a local single-wire bus●● ● ●● ● ●●36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 bus364_028Aerial reader unit for entry authorisation for keyless entry system J723Installation location of the aerial reader unit for entry authorisation for keyless entry system J723364_029Tasks of the entry and start authorisation button E408(The button is only installed in combination with the optional Advanced Key)●For security reasons, the current position of the entry and start authorisation button is provided to both the control unit and to the entry and start authorisation.Reference The functions of the entry and start authorisation switch are described in SSP 326 - Audi A6 ‘05 Electrical System.37Control unitsDoor control unitsJ386 J387 J388 J389 Driver door control unit Front passenger door control unit Rear left door control unit Rear right door control unitChanges to the Audi A6 ´05The 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.364_030Substitute master functionsIn case of failure of the convenience system central control unit J393, the driver door control unit acts as a substitute master for the central locking system. In this case, opening by remote control and the Advanced Key functions are not available. The vehicle must be opened and closed mechanically. In this case, the other door control units evaluate the information from the driver door control unit directly.VariantsThe door control unit for the Audi Q7 is available in two variants - a Min variant and a Max variant. The Max variant is required if the vehicle has any of the following functions:● ● ● ● ● ● ●Advanced Key Ambient lighting Outside lights Seat memory Exterior mirror fold-back Auto-dimming exterior mirror Electrical child lockInstallation locations of the control unit and the window lifter motorControl unitWindow lifter motor364_03138Driver and front passenger seat adjustment control unitsJ136 J521 Seat and steering column adjustment control unit with memory with memory function Seat adjustment control unit with memory, front passengerChanges to Audi A6 05The 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. The control unit recognises its installation location automatically based on the voltage level present at one of its terminal pins. This method is known as pin encoding.364_032Stored settingsThe following settings are stored by when the Save button on the driver side memory block is pressed or when the vehicle is locked with the remote control key: – Current position of the left and right exterior mirrors – Current driver seat settings – Current steering column position (if electrical steering column adjustment is installed)The following setting is stored when the Save button on the driver side memory block is pressed: – Current front passenger seat settingsThe driver side control unit J136 can store six different settings. Two settings can be stored with the Save buttons, the other four with different remote control keys. However, only two different settings can be stored with the Save buttons for the front passenger side control unit; it is not possible to store any settings with the remote control key. The basic prerequisite for all memory operations is that the memory block ON/OFF switch is set to "ON". The position of this switch is read by software from the driver door control unit J386 and transferred to the CAN bus. However, the switch position is also transmitted via hardware line through the driver door control unit and relayed from here to the seat control unit. Here, the hardware line prevents the activation of output modules for motor activation or disables active output modules.39Control unitsFunctionsElectrical 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. Only terminal 30 is required for adjusting the seats. If a power-down level of the energy management control unit is set, seat adjustment will not be possible or, if so, only to a limited degree.Saving settings and adjusting the seats using the programming buttons The settings described above can be saved by pressing the SET button and then pressing one of the two memory location buttons. The SET function remains enabled until the red function indicator LED in the button goes off. An acoustic signal is given as feedback when a setting has been saved successfully. Again, the prerequisite is that the memory block ON/OFF switch is set to "ON". Saved settings can be retrieved as follows:●If the driver door is open and "terminal 15 = OFF", the mirrors, driver seat and steering column or front passenger seat can be adjusted to the pre-configured positions by pressing briefly one of the two Save buttons. If the driver door is closed or "terminal 15 = ON", the Save button must be held pressed until the adjustment procedure is completed. The adjustment procedure can be interrupted by releasing the Save button.●Saving settings and memory adjustment using a remote control key The current mirror, driver seat and steering column positions can be saved to a remote control key as follows: – The settings are saved after closing the driver door and locking the vehicle with the remote control key. – After unlocking the vehicle with the remote control key and opening the driver's door, the mirror, driver seat and steering column are adjusted to the positions saved to the remote control key. The front passenger seat does not have this function.However, the function described above will only work properly if two basic requirements are met: – The menu item "Remote Control Key" must be set to "ON" in the MMI Car Menu under "Systems", "Seat Settings", "Driver Seat". – The memory block ON/OFF switch must be set to "ON".40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.Circuit diagram of the seat memoryMemory operating unit, driver seat E97The line for pin encoding the driver/front passenger control unit is only available if the passenger control unit is installedEmergency OFF, seatBackrest adjustment motorDriver seat adjustment operating unit E470Terminal 30gTerminal 58sTerminal 31Terminal 31Terminal 30Door control unit, driver side J386ON / OFFLED SETP1 / P2Emergency OFF, seatSeat and steering column adjustment control unit with memory with memory function J136Convenience CAN High Convenience CAN LowSeat rake adjustment motorTerminal 31SETSeat height adjustment motorSeat longitudinal adjustment motor 364_033Reference For further information, please refer to Self-Study Programme SSP 326.41Control unitsConvenience system central control unit J393Changes to Audi A6 ‘05The 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.364_034The pins which become available on the control unit are now used for activating the additional lamps because turn signals, brake and tail lights are installed both in the tailgate and in the bumper. This redundancy was necessary because the lights in the tailgate are not sufficiently visible to traffic following on behind when the tailgate is open.Master functions– – – – Turn signal master Central locking master Interior lighting master LIN master for the LIN bus users alarm horn H12 and interior monitoring sensor G273VariantsThe convenience system central control unit J393 comes in 2 variants for the Audi Q7: a basic variant and a Highline variant. The Highline variant differs from the basic variant in that it has two additional functions: – Activation of the rear footwell lights – Tailgate power latching control42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 Footwell lights, rear right Fuel tank cap release motor Rear window defroster relay Supply cables in the power latching motor Tailgate lock unlocking motor Wake-up signal for the adaptive suspension control unit J197 (if a vehicle door has been opened) Wake-up signal for the engine control unitBidirectional lines– High and Low CAN bus lines of the convenience CAN bus – LIN bus line to alarm horn H12 and interior monitoring sensor G273Inputs– – – – – – – – Microswitch for power latching system position information Brake light switch Softtouch in the tailgate Glass break detector for anti-theft alarm system (left and right side windows and rear window) Crash signal from airbag control unit Flashing light as confirmation of successful programming of the multipurpose garage door opener "Brake light on" is requested by the ABS control unit J104 due to an ACC braking operation Tailgate closed microswitch43Control unitsInputs 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 sunroofInstallation locationThe 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. The convenience system central control unit 2 J773 is located adjacent the convenience system central control unit on the left and is attached to the same bracket.364_03544Convenience system central control unit 2 J773The convenience system central control unit 2 J773 is a new control unit and will be used for the first time in the Audi Q7.TasksThe convenience system central control unit 2 J773 has the following tasks: – Evaluating the tailgate closed sender for rear lights switch-over – Activating the cargo space light or the light for the 3rd seat row (depending on whether 3 or 5 rear seats are fitted) – Activating the reversing lights in the bumper – Activating the rear fog lights in the bumper – Activating the sidemarkers (North America) – LIN master for the open sky systemInstallation locationThe convenience system central control unit 2 J773 is installed in the cargo space on the right below the load floor.VariantsMin variant – Standard equipment – Solid roof – 3 rear seats364_036Max variant – Luxury-level equipment – open sky system – 5 rear seats (3rd seat row)Master functionsThe convenience system central control unit 2 J773 is the LIN master for the open sky system. As the LIN master, the control unit is responsible for the functioning and the diagnostics of the open sky system.LIN Convenience system central control unit 2 J773 Sliding sunroof control unit J245 Rear sliding sunroof control unit J392 Sunroof roller blind control unit J394 364_05845Control unitsFunction diagramTerminal 30 Terminal 30 Reversing light, left Rear fog light, left Terminal 31J773Reversing 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 2364_037Evaluating the tailgate closed senderThe two switches G525 tailgate closed sender 1 and G526 tailgate closed sender 2 are read by the convenience system central control unit 2 J773. The control unit provides the position of the two switches on the convenience CAN bus. The convenience system central control unit J393 reads the switch information from the convenience CAN bus and activates the rear lights accordingly.Position of the switches G525 and G526 "tailgate closed": – The convenience system central control unit J393 activates the brake/tail lights and the turn signals in the main rear lights in the tailgate. – The brake/tail lights and turn signals in the additional rear lights in the bumper are not activated.Position of switches G525 and G526 "tailgate open": – The convenience system central control unit J393 activates the brake/tail lights and the turn signals in the bumper. – The brake/tail lights and the turn signals in the tailgate are not activated.Tailgate TS BT BTConvenience CAN busG525G526J393J773Legend TS BT RL RF Turn signal Brake/tail light Reversing light Rear fog lightTSBTRL BumperRF364_06046Emergency functionIn 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 flapFault memory entriesThe number of fault memory entries for the lights has been reduced. Only one fault memory entry is made per light assembly. Thus, only four fault memory entries are needed to cover the complete rear lighting. From the environmental data of the corresponding fault memory entry it can be determined which lamp in a light assembly is faulty.364_038Data blocksThe convenience system central control unit 2 J773 provides data blocks for the following functions: – Onboard power supply – Additional rear lights in the b