SSP344 The New Audi A6 Avant ´05 - Volkspage

Running gearDampersThe Audi A6 Avant ´05 with aas also hascontinuously adjustable rebound and compressiondamping characteristics.The front and rear axle dampers differ in respect oftheir design from the dampers on the A8. Theelectrically activated damping valve is located onthe exterior of the damper tube.For this reason, and also because the dampers forthe A8 and A6 are sourced from different systemssuppliers, we refer to the suspension system on theA6 as a Continuously Controlled ElectronicSuspension (CES) system.Damping valve344_017Separation of the rear axle springs anddampersThe advantages of this configuration are anoptimised through-loading width and low bootfloor. A boot protects the complete air springagainst ingress of dirt. Due to the size of the airsprings, no additional air volume is required, whichis the case with the A8 D3. The boot can be replacedby a service workshop.A new aluminium trapezoidal link was developed forthe aas.New aluminium trapezoidal link344_01416

Air supply unit and solenoid valve blockThe air supply unit and the solenoid valve block areidentical in design and function to those of theallroad quattro and A8.Both units are now mounted on a common bracket.Air supply unitSolenoid valve blockMounting bracket344_00717

Running gearRide heightsThe modes implemented in the Audi A6 Avant ´05 are the same as in the A8. However, the ride heights aredifferent. The following conditions apply to the aas in the Audi A6 Avant ´05:In "dynamic" mode, the car's ride height is lowered permanently by 15 mm compared to "automatic" mode.When the "lift" mode is selected, the car body is raised by 15 mm compared to "automatic" mode.The lowering of the suspension by 15 mm at motorway speeds in "automatic" mode is also implemented inthe Audi A6 Avant ´05. In the A6, there is no further reduction in ride height in "dynamic" mode, which is thecase in the A8.The same conditions as on the A8 must be met in order to select and quit the various modes.ReferenceFor further information, please referto the current operating instructionsand SSP 292.aas modes in the Audi A6 Avant ´05"lift""comfort""dynamic""automatic"+15 mm0 mm-15 mm0100 120kph344_03218

System failure responseIf the electrical damping valve is deenergised incase of failure, a default damping forcecharacteristic takes effect. In this case, the damperworks like a conventional (non-controlled) damper.Damper set-upDamping valve deenergisedDamping force (N)0Rebound dampingCompression dampingSpeed m/s 2 344_027344_020aas with MMI BasicThe aas system is available in the Audi A6 Avant ´05in combination with MMI and also, alternatively, incombination with MMI Basic .19

Running gearNew special toolsThe following new special tools are used for aas inthe Audi A6 Avant ‘05:T 40082/1-6 spring blocker for air springsDue to the modified installation dimensions, thespring blockers used for the A8 are unsuitable forthe A6. The advantage of using spring blockers onthe A6 front axle is that subsequent replacement ofthe upper transverse rods is no longer needed.344_018T 40081 rampWhen the system is fully vented , the suspensionwill be so low that, in case of unfavourabledimensional tolerances, a car jack cannot be used.In such case, the vehicle is driven up onto the 8 cmhigh ramps. A car jack or an auto-hoist can then beused.A new test adapter with the type designationVAS 1598/53 is used for the air spring control unit.344_01620

adaptive cruise control (acc)A new generation of the acc is used in theAudi A6 Avant `05. This acc incorporates thefollowing modifications:the exterior dimensions and weight of the acc unit(sender and control unit) were substantiallyreduced.Sensor / control unit in the A8Sensor / control unit in the A6344_015The number of radar transceivers integrated into the sender was increased from three to four.As a result, it was possible to increase the beam angle from 8 degrees to 16 degrees. By increasing the rangeof the sensor, objects in the path of the vehicle can be detected earlier. The maximum range of the objectdetector was increased to 180 metres from 150 metres. The acc functionality was significantly improved withregard to lane-changing and winding country roads.180 m344_03321

Running gearA heater was integrated into the bumper insert in front of the sender. It effectively prevents the build-up ofsnow or ice on the surface of the bumper in front of the sender in wintry road conditions. As a result, highersystem availability is assured.The heater is powered by the adaptive cruise control unit.The heater is switched on and off in dependence on the ambient temperature.The dynamic response of the vehicle in acc modeunder acceleration and under braking can now beadapted to suit the driver's preferences by selectinga driving program in addition to the distance settingfunction. Three different driving modes can beactivated with the MMI (for detailed information,refer to the current operating instructions).Caradaptive cruise controlGong volumeDriving modemediumcomfort344_021Rough adjustment is no longer required for settingthe sender in the service workshop.344_05822

ESPThe Bosch 8.0 ESP system previously featured in the A6 saloon will also be used in the Audi A6 Avant`05.Several new functions will be implemented for use of the Bosch 8.0 ESP system in the Audi A6 Avant ´05.To implement these auxiliary functions, the processing power of the ESP control unit was enhanced byincreasing the clock frequency to 60 MHz from 48 MHz. The new control unit will also be rolled out at the sametime in the A6 saloon.Modified hydraulic brake assistant control for vehicles with accWhen the vehicle is travelling, acc continuously monitors objects in front of the vehicle within the range of theradar sensor. The object detection function remains active even after the acc function has been deactivated bythe driver. The system has the capability to assess the "hazard potential" of a traffic situation. It does so byevaluating a variety of parameters, including the number, position and speed of objects detected, thedistance to the objects detected, own vehicle speed etc.If a "potential hazard" is identified, the brake system isprefilled and the cut-in threshold of the brake assistant is reduced.Automatic activation of the hazard warning light systemIf the brakes are applied hard, the hazard warninglight system is activated automatically to alerttraffic following on behind. On vehicles with theHighline trim, the surfaces of the brake lights arealso enlarged, depending on the countryspecification.344_040Extended understeer correctionWhen a vehicle is understeering, it can be stabilised by braking the wheels on the inside of the corner.However, if the cornering speed of the vehicle is too high to achieve the required curve radius, this actionalone will not be sufficient. In such case, all four wheels are braked and engine torque is simultaneouslyreduced. A slightly higher brake pressure is applied to the inside rear wheel. In this way, the road speed of thevehicle is reduced and the vehicle is stabilised.23

Running gearAutomatic stabilisation of the car-trailer combinationSlight swinging movements of a trailer can amplifyin such a way as to cause a critical driving situation.This situation usually occurs at road speedsbetween 75 and 120 kph.If the trailer begins to swing when the vehicle istravelling at a speed above the critical threshold, theoscillation amplitude of the trailer will progressivelyincrease. The only way to reduce the swinging of thetrailer is to reduce speed to below the criticalthreshold.The swinging movements also excite periodicoscillation of the towing vehicle about its verticalaxis. These yaw movements are monitored by theyaw rate sender and evaluated by the ESP controlunit. If defined limits are exceeded, the ESP controlunit instructs the engine control unit to reducetorque in order to slow the vehicle down. If thisaction is insufficient, all four wheels are brakedsimultaneously by the ESP control unit.344_038Enhanced acc braking comfortOn vehicles with acc, two additional pressuresensors are installed in the lines between the ESPunit and the front-axle brake calipers. The previousmethod, whereby the actual brake pressure wascalculated in the control unit, is less accurate thanthe direct measurement method, particularly at lowbrake pressures. Using the data supplied by thepressure sensors , ESP can control the build-up ofbrake pressure more precisely. This results inshorter reaction times, and braking becomes morecomfortable.Brake pressure sensor344_04124

Notes25

Electrical systemsBus topologyIn comparison with the A6 saloon, the bus topologywas extended only to include the tailgate controlunits in the convenience CAN bus. The tailgatecontrol unit is explained in detail from page 32.Distance controlJ428Control unit with displayin dash panel insertJ285Diagnosis connectionT16Databus diagnosisinterfaceJ533Park assistJ446NOx sensorJ583Engine electronics 1J623Driver door controlunitJ386EnergymanagementsystemJ644Yaw rate senderG202ABS with EDLJ104Front passenger doorcontrol unitJ387Additional heatercontrol unitJ364Seat occupiedrecognition controlunitJ706AirbagJ234Rear left door controlunitJ388Tailgate control unitJ605Automatic gearboxcontrol unitJ217Rear right doorcontrol unitJ389Onboard powersupply 2J520Power output modulefor left headlightJ667Power output modulefor right headlightJ668Headlight rangecontrol, control unitJ431Electric park andhandbrake controlunitJ540Seat and steeringcolumn adjustmentcontrol unit withmemoryJ136Seat adjustmentcontrol unit withmemory, frontpassengerJ521Entry and startauthorisation controlunitJ518Onboard powersupplyJ519Adaptive suspensioncontrol unitJ197Trailer detectorcontrol unitJ345Convenience systemcentral control unitJ393Wheel angle senderG85Steering columnelectronics controlunitJ527Climatronic controlunitJ255Multi-functionsteering wheelcontrol unitJ453Tyre pressuremonitor control unitJ50226

Telephonetransmitter andreceiver unitR36Front informationcontrol unitJ523Telephone /telematicscontrol unitJ526Telephone handsetR37Navigation systemwith CD drivecontrol unitJ401CD changerR41TV tunerR78Digital soundpackage control unitJ525Radio moduleRLanguage inputcontrol unitJ507Tailgate controlunit 2J605MOST busInstrument cluster CAN busEntry and startauthorisation switchE415Antenna reader unit forentry authorisation forkeyless entry systemJ723Diagnosis CAN busPowertrain CAN busWiper motorcontrol unitJ400Rain and lightdetector sensorG397busConvenience CAN busAdaptive cruise control CANLIN busInterior monitoringsensorG273Alarm hornH12Various subbus systemsFresh air blowercontrol unitJ126Refrigerant pressure/temperature senderG395Wireless transmission- Bluetooth signalTransmitter unit,front leftG431Transmitter unit,front rightG432Transmitter unit,rear leftG433Transmitter unit,rear rightG434Rear antennaR96344_00927

Electrical systemsImmobiliser in automatic gearboxIn the Audi A6 Avant '05, the automatic gearbox wasintegrated into the immobiliser. This is the case withboth 6-speed automatic gearbox 09L andmultitronic gearbox 01J. With model year '06 orlater, the automatic gearboxes in the A6 saloon andin the A8 will also have an immobiliser function.The immobiliser still has the type designation"Immobiliser 4", because it uses the sametechnology as in the A8 '03.These gearboxes have a control unit which isintegrated into the gearbox (mechatronics). Therelatively sophisticated, and hence secure,installation location serves as a deterrent to partstheft. Because engagement for power transmissionis dependent on the gearbox control unit, thisimmobiliser offers good protection against vehicletheft.Immobiliser topologyJ518E415J533J623J217344_013LegendE415 Entry and start authorisation switchJ217 Automatic gearbox control unitJ518 Entry and start authorisation control unitJ533 Databus diagnosis interfaceJ623 Engine control unitComponent which is not integrated into theimmobiliserComponent which is integrated into theimmobiliserMaster control unitPC / mainframe28

MatchingThe procedure for matching the gearbox controlunit is similar to the procedure for matching theengine control unit.The immobiliser still has the type designation"Immobiliser 4", because it uses the sametechnology as in the A8 '03.Furthermore, the gearbox is able to accept a newidentity. If a key is stolen and the complete key set isreplaced, all control units integrated into theimmobiliser can assume a new identity.Response to non-matched control unitIf only the gearbox control unit is not matched, canthe engine can be started in the usual fashion. Thegearbox control unit detects the missing or falseimmobiliser information. This is indicated to thedriver by an inverted selector lever positionindicator on the centre display of the dash panelinsert. If a new control unit is used, the vehicle canbe operated in an emergency mode with amaximum speed of approx. 20 kph, provided thatthe control unit has not previously been matched toany other vehicle.If the control unit has already been installed inanother vehicle, emergency operation will not bepossible. The selector lever can be engaged by thedriver. However, the control unit will prevent tractivepower from flowing to the output shaft. As withother immobiliser components, it is only possible tomatch such a control unit in a vehicle of the samemodel, i.e. a gearbox which has already beenmatched to an A8 cannot be matched to an A6.Gearbox modificationsmultitronicThe 01J gearbox has no mechanical emergencyrunning mode. The modifications to the immobiliserrelate only to the software and certain electroniccomponents in the gearbox control unit.6-speed automatic gearbox325_071In the case of the 09L and 09E gearboxes, thehydraulic control unit was modified in addition tothe software and the hardware so that there is nopower transmission when deenergised. To achievethis, the characteristics of several electric pressurecontrol valves have been inverted.325_05129

InfotainmentOverview of the infotainment systemsMMI basicMMI basic plusStandard equipmentDisplay Monochrome 6.5" screen Monochrome 6.5" screenControl panel 4-key control panel 4-key control panelOperating and display unitcontrol unitAmplifierRadioCD driveIn the glove compartment– incl. radio module– incl. audio single CD drive– incl. 2x20W amplifierfor 4 loudspeakers, frontIntegrated into the operating and displayunit control unitRadio with diversity radio antenna,integrated into the operating and displayunit control unitIntegrated into the operating and displayunit control unitIn the glove compartment– incl. radio module– incl. audio single CD driveDSP sound system with 160 W total poweroutput in the luggage compartment, rear left,for 10 loudspeakersRadio with diversity radio antenna and TPmemory function, integrated into theoperating and display unit control unit.On the 4-key control panel, the TP memoryfunction can be selected via the radio set-up.Integrated into the operating and displayunit control unitNavigation _ _OptionalCD changer CD changer in the glove compartment CD changer in the glove compartmentMobile phone preparationBluetooth mobile phone preparationintegrated into the centre armrestincl. 8-key control panelBluetooth mobile phone preparationintegrated into the centre armrestincl. 8-key control panelBOSE amplifier _ BOSE 6000 amplifier with– BOSE Audi-Pilot– 8-channel amplifier with 270 W totalpower output– 13 loudspeakersNavigation _ _Permanently installedtelephone__Voice control system _ _TV reception _ _30

MMI basic plus with CD navigation systemMMIMonochrome 6.5" screen 7" colour screen8-key control panel8-key control panelIn the glove compartment– incl. radio module– incl. navigation module– incl. single CD drive for navigation or audioCDDSP sound system with 160 W total poweroutput in the luggage compartment rear leftfor 10 loudspeakersRadio with diversity radio antenna and TPmemory function, integrated into theoperating and display unit control unitIn the dash panelDSP sound system with 160W total poweroutput in the luggage compartment rear leftfor 10 loudspeakersRadio with dual tuner, diversity radioantenna and TP memory function,in the luggage compartment, rear leftCD changer in the glove compartmentCD changer in the glove compartmentCD navigation system integrated into theoperating and display unit control unit__Bluetooth mobile phone preparationintegrated into the centre armrest2. CD changer in the glove compartmentBluetooth mobile phone preparationintegrated into the centre armrestBOSE 6000 amplifier with– BOSE Audi-Pilot– 8-channel amplifier with 270 W totalpower output– 13 loudspeakers____BOSE 6000 amplifier with– BOSE Audi-Pilot– 8-channel amplifier with 270 W totalpower output– 13 loudspeakersDVD navigation system in the luggagecompartment, rear leftPermanently installed telephone incl.cordless handsetVoice control system in the K-boxAnalog TV receiverAnalog TV receiver and digital TV receiver31

Convenience electronicsTailgate drive control units J605 and J756IntroductionFor increased user convenience, an automatictailgate is optional in the new Audi A6 Avant ´05. Theautomatic opening and closing function isimplemented by two electric motors mounted onthe tailgate hinges. Each electric motor has a stepupgear, a magnetic coupling, measuring sensorsand an electronic control unit. The tailgate drive onthe driver side (left-hand side) is the system master;it is connected to the convenience CAN bus. Thetailgate drive on the front passenger side is theslave.Tailgate controlunit-master-J605Tailgate control unit-slave-J756344_034Automatic openingOpening of the automatic tailgate can be initiatedby pressing the centre button on the remote controlkey, or by pulling the release button on the driver'sdoor, or by pressing the handle on the tailgate. Theopening cycle can be interrupted by repeating theinitiating operation. Pressing again the centrebutton on the remote control key or the tailgaterelease button in the driver's door continues theinterrupted opening cycle.Tailgate release button in the driver door344_04332

Saving the limit position of the tailgateIf the tailgate was stopped in an intermediateposition, this position can be saved as a future endposition. To do this, the "close" button on thetailgate must be pressed for at least 5 s. Please notethat this function is only available as of a minimumopening angle of 45 degrees."Close" button in the tailgate344_045Automatic closingFor safety reasons, automatic closing can only be initiated with the tailgate "close" button or with the tailgatehandle. Automatic closing can also be interrupted by repeating either operation.Pressing the "close" button or the tailgate handle again would, however, not continue the closing cycle, butwould initiate an opening cycle.The magnetic couplingThe torque generated by the electric motor to openand close the tailgate is transmitted via a magneticcoupling. The magnetic coupling consists of apermanent magnet and a solenoid. When thetailgate is opening, the magnetic effect of thepermanent magnet is intensified by the solenoid sothat a sufficiently high torque can be transmittedfrom the electric motor.The permanent magnet alone can hold the tailgatein an open position against its weight and againstthe pressure of the gas-filled spring. When thetailgate is opened or closed manually, the solenoidproduces a magnetic field which neutralises themagnetic effect of the permanent magnet.The magnetic coupling is open and the tailgate canmove freely.344_03133

Convenience electronicsManual tailgate operationWhen the tailgate is moved manually from astopped intermediate position, the deenergisedholding torque is overcome and the "Manual" modeis activated. This manual movement is detected bymeans of Hall sensors, whereupon the control unitsenergise the couplings in the "freewheel" direction.When movement stops, the couplings isdeenergised after approximately one second andthe tailgate holds its position automatically.A second possible way to operate the tailgatemanually is to open the closed tailgate by means ofthe tailgate handle button. The couplings will thenalso be energised in the "freewheel" direction. Thisstate is maintained for approximately 0.5 secondsafter releasing the handle button. If no manualoperation is detected during this phase, thecouplings will again be energised in the "open"direction and the tailgate will open automatically.Electric motorControl unitMagnetic couplingTorque bar2nd gearDrive lever344_042Speed controlThe torque needed to open and close the tailgate isdependent upon several factors, such as themomentary vehicle position, ambient temperatureand momentary tailgate position. For this reason, aspeed regulator was implemented in the controlunit; it adjusts the momentary motor speed to adefault speed characteristic. Motor speed iscontrolled via a high-frequency PWM signal whichcontrols the motor current.34

SensorsRoad speed is monitored by a Hall sensor on the lefttailgate drive. The right tailgate drive also has a Hallsensor which detects when "manual" mode isrequired. An additional three small Hall sensors onthe left-hand side monitor the direction ofmovement of the tailgate and the current tailgateposition. The Hall sensors are also used for antipinchprotection.This is implemented by a speed/distance detectionsystem. If an obstruction detected, the drive willstop. If an obstruction is detected during a closingcycle, the tailgate is reopened approx. 4 degrees.344_053Hall sensor PCB for the detecting the direction of movement ofthe tailgate and the tailgate positionTransport mode and standby current managementWhen transport mode is activated, the tailgatecontrol unit is activated, too. In this condition, thetailgate must be operated manually. The electricmotors are deactivated and only manual operationis possible. The same applies to standby currentmanagement from power-off stage 2.Deactivating the electrical tailgate driveThe following system faults will cause the electrictailgate drive to be deactivated:·– No CAN communication with driver door controlunit J386– No CAN communication with conveniencesystem central control unit J393– No CAN communication with entry and startauthorisation control unit J518– Components protection in convenience systemcentral control unit J393 active– The tailgate power latching system does notstart up when the tailgate is open or the starteduppower latching system provides no feedbackto the convenience system central control unitJ39335

Convenience electronicsSystem overview - Tailgate control unitTailgate closing buttonin tailgateTailgate control unit,driver sideJ605Discrete communicationwireTailgate control unit,front passenger sideJ756Wake-up lineRear right power latchingmotorTailgate release buttonin driver doorDriver doorcontrol unitJ386Convenience systemcentral control unitJ393Softtouchhandle intailgateData bus diagnosticinterfaceJ533Convenience CAN busEntry and startauthorisationcontrol unitJ518CLS antennaPowertrainCAN busABS with EDLJ104Power managementsystemJ644Trailer detectorcontrol unitJ345344_037● The tailgate control unit J605 receives the vehicle speed signal from the ABS with EDL control unit J104.For safety reasons, automatic tailgate opening and closing are deactivated at a vehicle speed of 3 kph.●If the tailgate control unit J605 receives from the trailer detector control unit the information "trailerdetected", the automatic tailgate operation will also be deactivated for safety reasons.36

Softtouchin the tailgateTerminal 30Terminal 30Convenience system central control unitJ393Power latchingsystemConvenience CAN busTailgate lockTailgate control unit- master -J605Tailgate control unit- slave -J756Interior tailgatereleaseSensorsSensorsMagnetic couplingMagnetic coupling344_036● The tailgate control unit master J605 communicates with the tailgate control unit slave J756 via a singlewirebus specified by systems supplier Valeo (no LIN bus).● Via the wake-up line, the tailgate control unit master J605 can wake up the tailgate control unit slave J756.This is the case if the convenience CAN bus is reactivated in Sleep Mode, or if the interior tailgate release isoperated while the convenience CAN bus is in Sleep Mode. The slave tailgate control unit wakes up themaster control unit J605 if manual operation of the tailgate is detected .●The function block of the rear right power latching motor shows two sensors. They have the task ofmonitoring the two end positions of the power latching system and informing the convenience systemcentral control unit when they are reached.37

Convenience electronicsSlave start connectors in the engine bayTo make the A6 more service-friendly, slave startconnectors are installed in the engine bay of theAudi A6 Avant '05 and the A6 saloon from modelyear '06.Here, the slave start connectors are much morereadily accessible than in the luggagecompartment. The slave start connectors arelocated above the right-hand suspension struttower. The positive pole is concealed below a redplastic cover. The slave start connector was deletedfrom the luggage compartment.344_023The advantage of locating the slave start connectorin the engine bay is that the charger cannot bedirectly terminated to the battery by mistake. In theevent that a charger is terminated directly to thebattery, the energy management control unit J644not know if the battery is charged, and, in somesituations, may activate power-off stages even incase of a charged battery. This will ultimately causeloads to be shut down unnecessarily.344_02438

Self-study programmes on the Audi A6 AvantSSP 323 Audi A6 ´05– Introduction to the vehicle– Body engineering– Occupant protection– Air conditioningOrder number: A04.5S00.06.20323_057SSP 324 Audi A6 ´05 Running Gear– Front axle technology– Rear axle technology– Steering system– ESP– Electromechanical Parking Brake EPBOrder number: A04.5S00.07.20323_058SSP 325 Audi A6 ´05 Engines andTransmissions– 3.0 V6 TDI Common Rail– 3.2 V6 FSI– Manual transmissions 01X, 02X, 0A3– 6-step automatic transmission 09L– Multitronic 01JOrder number: A04.5S00.08.20323_059SSP 326 Audi A6 ´05 Electrical Systems– Networking– Bus topologies– Convenience electronics– InfotainmentOrder number: A04.5S00.09.20323_056

Vorsprung durch Technik www.audi.de344All rights reserved.Technical specificationssubject to change withoutnotice.CopyrightAUDI AGI/VK-35Service.training@audi.deFax +49-841/89-36367AUDI AGD-85045 IngolstadtTechnical status: 02/05Printed in GermanyA05.5S00.13.20