The 2011 Audi A8 Introduction - DataRunners

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Self-Study Program 990103The 2011 Audi A8 Introduction

Audi of America, LLCService TrainingPrinted in U.S.A.Printed 4/2010Course Number 990103 2010 Audi of America, LLCAll rights reserved. Information contained in this manual isbased on the latest information available at the time of printingand is subject to the copyright and other intellectual propertyrights of Audi of America, LLC., its affiliated companies and itslicensors. All rights are reserved to make changes at any timewithout notice. No part of this document may be reproduced,stored in a retrieval system, or transmitted in any form or byany means, electronic, mechanical, photocopying, recording orotherwise, nor may these materials be modified or reposted toother sites without the prior expressed written permission ofthe publisher.All requests for permission to copy and redistributeinformation should be referred to Audi of America, LLC.Always check Technical Bulletins and the latest electronicservice repair literature for information that may supersede anyinformation included in this booklet.

Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2ASF Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Body Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6High Strength Load-Bearing Body Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6B-Pillar and B-Pillar Striker Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Joining Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Multifunctional Large Castings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Passive Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Airbag Control Module J234 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Seatbelts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Front Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Knee Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Active Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Active Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Audi Pre Sense Safety System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .264.2L V8 FSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Volume-Flow Controlled Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Innovative Thermal Management (ITM) in the 4.2L V8 FSI Engine . . . . . . . . 30Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36Suspension System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Adaptive Air Suspension (aas) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Brake Discs, Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Brake Assembly, Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Steering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Tire Pressure Monitoring (TPMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Adaptive Cruise Control (ACC) . . . . . . . . . . . . . . . . . . . . . .44i

Table of ContentsElectrical System/Networking . . . . . . . . . . . . . . . . . . . . . .45Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46New Bus System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48FlexRay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Comparison Between CAN bus and FlexRay . . . . . . . . . . . . . . . . . . . . . . . . . . 50Instrument Cluster. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Background Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52New Driver Assistance Systems . . . . . . . . . . . . . . . . . . . .53Audi Night Vision Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Audi Drive Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57System Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58Heating, Ventilation, and Air Conditioning (HVAC) . . . . .59Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Humidity Sensor in Fresh Air Intake Duct G657 . . . . . . . . . . . . . . . . . . . . . . . . 63Coolant Shut-Off Valve N82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Front Seat Ventilation and Massage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Infotainment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66Audi Multi Media Interface (MMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66DVD Changer R161 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Audi Music Interface (AMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74Rear Seat Entertainment (RSE) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Sound Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78Antenna Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80Advanced Maintenance Display . . . . . . . . . . . . . . . . . . . .81Self-Study Programs for the 2011 Audi A8 . . . . . . . . . . .82Knowledge Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . .83The Self-Study Program provides introductory information regarding the designand function of new models, automotive components or technologies.The Self-Study Program is not a Repair Manual!All values given are intended as a guideline only.Refer to the software version valid at the time of publication of the SSP.For maintenance and repair work, always refer to the current technical literature.iiReferenceNote!

IntroductionAudi has launched the next generation A8, asedan that sets new standards in the luxuryclass. The 2011 Audi A8 combines prestige,intelligence, dynamics, comfort, and efficiency.It features an elegant Audi Space Frame (ASF)body that is made of lightweight aluminum. Theengine is both powerful and highly efficient,with the power transmission and running gearoffering excellent driving dynamics and comfort.The flagship’s interior has luxuriousappointments, a newly developed MMI operatingsystem, and handcrafted details. Innovativedriver assistance and safety systems improve theentire driving experience.The new A8 will initially be offered with a 4.2LV8 FSI engine rated at 372 hp (273 kW). Fueleconomy has improved by as much as 22% dueto intelligent technologies such as new energyrecuperation and thermal management systems.A next generation 8-speed Tiptronictransmission, combined with quattro permanentall-wheel drive, both standard in the 2011 AudiA8, unleash the sport characteristics of thevehicle.New to the flagship is Audi’s modularlongitudinal platform design, which featuresredesigned kinematics and elasto-kinematics,a set-forward front axle, reconfigured front axlecomponents, a new steering position under thecenter of the front wheel, and upper control armmounting integrated into the body.The 2011 Audi A8 offers an updated Multi MediaInterface (MMI) that features a touch screen pad,MMI touch. No buttons, no joysticks. Drivers canenter navigation destinations and telephonenumbers by simply using their fingertips to writeletters and numbers on the pad.The new Audi A8 also features streamlined CANdata bus technology, and the new FlexRay databus system. FlexRay is faster and more reliablethan CAN and other data bus systems, and offersimportant system-wide redundancy for safetysystems.The mission of the 2011 Audi A8 is to continuethe remarkable success story begun by itspredecessor, which surpassed 150,000 unit salesworldwide.456 1261

Body57.4 in (1460.0 mm)Dimensions57.2 in (1453.0 mm)64.7 in (1644.0 mm)64.3 in (1635.0 mm)76.7 in (1949.0 mm)83.1 in (2111.0 mm)456 097a38.7 in(983.0 mm)27.1 in(690.0 mm)40.7 in(1036.0 mm)39.4 in(1003.0 mm)117.7 in (2992.0 mm)39.4 in(1003.0 mm)202.4 in (5137.0 mm)456 097b2

59.0 in(1501.0 mm)57.6 in(1464.0 mm)40.9 in(1040.0 mm)35.6. in (906.0 mm)456 097cLength in/mm202.2 in (5137 mm)Front internal width in/mm59 in (1501 mm)Width in/mm76.7 in (1949 mm)Rear internal width in/mm57.6 in (1464 mm)Height in/mm57.4 in (1460 mm)Front headroom in/mm40.7 in (1036 mm)Front track width in/mm64.7 in (1644 mm)Rear headroom in/mm38.7 in (983 mm)Rear track width in/mm64.3 in (1635 mm)Loading width in/mm57.2 in (1453 mm)Wheelbase in/mm117.7 in (2992 mm)Load sill height in/mm27.1 in (690 mm)Towing capacity lb/kg1653.4 lb (750 kg) –5070.6 lb (2300 kg)Luggage capacity cu ft/l18 cu ft (510 l)Curb weight lb/kg4045.4 lb (1835 kg)Fuel capacity gal/l23.7 gal (90 l)Maximum allowablegross weight lb/kg5566.6 lb (2525 kg)Drag coefficient cw0.263

ASF BodyThe body of the 2011 Audi A8 employs theproven Aluminum Space Frame (ASF) design.The structure is a composite of aluminumextruded sections, aluminum diecastings, laserwelded aluminum blanks, and sheet aluminumcomponents.Audi uses 13 different grades of aluminum andseveral different grades of ultra high strengthand advanced high strength steel in the new A8.4The 4.2 FSI V8 weighs in at 4,023.44 lb(1,833.5 kg), considerably less than any of itscompetitors, despite the added weight of thestandard quattro all-wheel drive system.The new A8 weighs almost 66.14 lb (30 kg) lessthan the previous generation A8. The ratio ofmaterial mass to torsional stiffness is improvedby approximately 20%.All of the body components provide optimalfunction and significant weight savings.

456 054Aluminum castingsAluminum extruded sectionsSheet aluminum componentsUltra high strength steel (thermoformed)Advanced high strength steel5

Body PanelsAll body panels are made of aluminum. The doorand window frames are a monoblock concavedesign and are made from sheet aluminum.456 056High Strength Load-Bearing Body PanelsHigh strength aluminum alloy sheet panelsare used for strategic load-bearing in the bodystructure. These panels reduce body weightwhile increasing body strength. In all, 15component body parts of the 2011 Audi A8are manufactured from high strengthaluminum alloy.456 1646

B-Pillar and B-Pillar Striker PanelThe B-pillar is a welded steel assembly. The pillaris manufactured from ultra high tensile hotformed steel while the striker panel is made fromadvanced high strength steel (AHSS).If repairs to the B-pillar are necessary, thecomplete welded assembly is available.456 057456 058Attachment of B-Pillar to BodyThe welded B-pillar assembly is attached to thebody by flow drill screws. It is also bonded toincrease strength, insulate the body, and limitcontact corrosion.The outer skin is attached to the B-pillar bybonding and punch riveting.456 0557

Joining TechniquesLaserweldingAluminumsolid punchrivetingFlow drillscrewingMIGweldingAdhesivesPunchriveting456 147A variety of joining techniques are used on the2011 Audi A8:– Metal Inert Gas (MIG) welding– Laser welding (roof seam)– Punch riveting (also used for joining thealuminum body panels to the steel B-pillar)– Flow drill screwing– Solid punch riveting– Clinching (attachments only)8

Multifunctional Large CastingsUsed primarily in high stress areas,multifunctional large castings also offer morefreedom for design.For example, the A-pillar node on the new A8 isa multifunctional casting that fulfills a numberof structural tasks. It interconnects all of thefollowing: the longitudinal member, the sill, thewindshield crossmember, the roof frame, thesuspension strut mount, and the “omega” crossmember.Most of the 25 castings in the ASF of the newA8 are manufactured using a vacuum pressurediecasting process.456 060Side Member MountingTo make repairs more simple and less expensive,the front part of the side member is bolted, ason previous models.456 0619

Passive SafetyOverviewThere is close-knit interaction between the driverassistance and passive restraint systems in the2011 Audi A8.The occupant protection system has thefollowing features:– Airbag control module– Driver and passenger knee airbags– Adaptive driver and passenger airbags– Side airbags, front and rear– Rear inertia reel seatbelts with pyrotechnicbelt tensioners– Audi Sideguard (side curtain airbags)– Battery interrupt igniter– Up-front crash sensors– Seatbelt reminder for driver and frontpassenger– Door-integrated crash sensors for side impactdetection– Crash sensors for side impact detection on theC-pillars– Front inertia-reel seatbelts with pyrotechnicand electrically reversible belt tensioners andactive belt force limiters– Seatbelt switch, driver and front passengerside– Seat occupied sensor in front passenger seat– Driver and front passenger seat K19K75K14510Driver’s Seat Belt SwitchFront Passenger Seat Belt SwitchDriver Thorax Airbag Crash SensorFront Passenger Thorax Airbag Crash SensorLeft Rear Thorax Airbag Crash SensorRight Rear Thorax Airbag Crash SensorDriver Front Airbag Crash SensorFront Passenger Front Airbag Crash SensorPassenger Occupant Detection System Pressure SensorDriver Belt Force LimiterFront Passenger Belt Force LimiterDriver Seat Position SensorFront Passenger Seat Position SensorAirbag Control ModuleFront Passenger Seat Position SensorData Bus On Board Diagnostic InterfaceEngine Control ModulePassenger Occupant Detection System Control ModuleLeft Front Seat Belt Tensioner Control ModuleRight Front Seat Belt Tensioner Control ModuleSeat Belt Indicator LightAirbag Indicator LampFront Passenger Airbag -Disabled- Indicator 1N252N253N295N296N419N420N490T16Driver Airbag IgniterFront Passenger Airbag Igniter 1Front Passenger Airbag Igniter 2Driver Seat Belt Tensioner Igniter 1Front Passenger Seat Belt Tensioner Igniter 1Left Rear Seat Belt Tensioner IgniterRight Rear Seat Belt Tensioner IgniterDriver Thorax Airbag IgniterFront Passenger Thorax Airbag IgniterLeft Rear Thorax Airbag IgniterRight Rear Thorax Airbag IgniterDriver Head Curtain Airbag IgniterPassenger Head Curtain Airbag IgniterBattery Interrupt IgniterDriver Knee Airbag IgniterFront Passenger Knee Airbag IgniterDriver Active Head Restraint SolenoidFront Passenger Aactive Head Restraint SolenoidDriver Airbag Release Valve IgniterData Link Connector

990103 001a11

Airbag Control Module J234The purpose of J234 is to measure and evaluatethe vehicle’s acceleration and deceleration todetermine if a collision has occurred. Externalsensors, as well as those in the control moduleare used. J234 can only detect an accident fromthe information provided by the sensors.The main tasks of the airbag electronics are:Once all of the sensor information has beenevaluated, J234 decides when and which safetycomponents will be activated. Dependingon the severity and nature of the impact, theappropriate restraint systems (belt tensioner orbelt tensioner and airbag) are activated.– Defined deployment of the belt tensioners,airbags, and battery isolatorOther vehicle systems are also notified of thecollision event.Through continued development, J234 no longerneeds a second crash sensor (“safety switch”) forhead-on impact detection.Airbag ControlModule J234– Evaluation of all input information– Continuous monitoring of the overall airbagsystem– Collision detection (front, side, rear)– Defined activation of front airbag adaptivity– Defined activation of the adaptive belt forcelimiter– Independent power supply through acapacitor for a defined period of time(approximately 150 ms)– Fault indication by the airbag warning lamp– Storage of fault and crash information– Notification of a collision event to othersystem components via the Powertrain CAN– Activation and deactivation of the seatbeltreminder function456 079Rollover Protection SystemTwo additional sensors for rollover recognitionhave been integrated into J234. For higherrollover recognition sensitivity, information isalso collected from ABS Control Module J104,Active Steering Control Module J792, andSteering Angle Sensor G85.12J234 does not require additional informationfrom these sensors. It is capable ofindependently identifying a rollover situation.When a rollover is detected, the seatbelttensioners and Audi Sideguard airbags areactivated.

Data ExchangeSide AirbagsAirbag Control Module J234 continuouslyexchanges information with other vehiclesystems on the Powertrain CAN, sending thefollowing information:Side airbags are used for all outside seatingpositions. They are equipped with solid fuelgenerators.– Airbag Indicator Lamp K75 ON/OFFAudi Sideguard– Status of seatbelt buckles– Diagnostic data– Crash signal/crash severity– Crash information for the actuator test– Seat position– Front passenger front airbag statusJ234 also evaluates the following information:– Dimming for the passenger OFF warning lamp– Vehicle stationary or moving– Collision prediction*Side curtain airbags cover almost the entireside window area. The length of the airbagvaries according to A8 body shape (long or shortwheelbase). These airbags are inflated by hybridgas generators integrated in the D pillars of thevehicle.Battery InterrupterDuring a collision, Battery Interrupt IgniterN253 is the pyrotechnic battery interruptingcomponent.– Speed relative to objects*BatteryInterrupterN253*With Adaptive Cruise Control (ACC)and Audi side assist only456 026Seat Position SensingBelt TensionersTo adapt the function of the belt force limiterand front airbags to the exact requirements ofthe moment, J234 must know if the seats arein forward or rearward positions. Seat PositionSensors G553 and G554 provide this informationfor J234.Rack-type belt tensioners are used on the frontseats. Band driven belt tensioners are usedon the rear outer seats. These tensioners areintegrated into the inertia-reel seatbelts.13

SeatbeltsThe following functions are integrated into thefront inertia-reel seatbelts:Belt tensionercontrol module– Reversible belt tensioner with control module– Pyrotechnic belt tensioner– Adaptive belt force limiterElectricmotorReversible belt tensioners:– Left Front Seat Belt Tensioner ControlModule J854Active beltforce limiter– Right Front Seat Belt Tensioner ControlModule J855Control modules J854 and J855 communicate viathe Extended CAN bus and Data Bus On BoardDiagnostic Interface J533. The control modulesactivate electric motors which vary the tensionapplied to the belts.Three different force levels are available:1. Low force belt slack reductionPyrotechnicbelt tensioner456 0772. Medium force partial tensioningGeardrive3. High force full tensioningIf Airbag Control Module J234 detects a minorhead-on collision where the belt tensioners arenot needed, a corresponding signal is sent tocontrol modules J854 and J855 to initiate fullelectrical motor tensioning of the seatbelts.DrivingplateWhen the electric motors operate, a driving plateis driven by toothed gearing. Two hooks extendconnecting the driving plate to the seatbeltretractor shaft. The seatbelt is retracted. Whenthe motors stop or reverse slightly, the hooksretract, releasing the seatbelt retractor shaft.Hook456 014DrivingplateHook456 01314

Adaptive Belt Force LimiterThe front inertia-reel seatbelts have dual-stagebelt force limiters. In a head-on collision wherethe impact force exceeds a predetermineddeployment threshold, the pyrotechnic belttensioners are ignited first.The inertia-reel seatbelt blocking mechanismthen blocks the seatbelt retractor shaft,preventing the seatbelt from unwinding.Otherwise, due to the forward motion of theoccupants, the seatbelts would attempt torewind.To reduce the load exerted on the occupantsby the seatbelt, the seatbelt retractor shaft anda belt winder allow the seatbelt to unwind in acontrolled way.The airbag control module activates the beltforce limiter igniter according to the force ofimpact and the longitudinal position of the seat.The force counteracting the seatbelt isdistributed as follows:1. From the seatbelt reel to the blockingmechanism via the seatbelt retractor shaft.The seatbelt retractor shaft twists like atorsion bar.2. From the seatbelt reel to the blockingmechanism via the toothed segments, thesupport ring, and metal bands. The metalbands are connected to the support ring andblocking mechanism. The metal bands Seatbeltretractor shaftMetalbandsBlockingmechanismSupportring456 030Retainingring15

atbeltreelBlockingmechanismSupportring456 032If Airbag Control Module J234 detects a minorhead-on collision where the pyrotechnic belttensioners are not needed, a correspondingsignal is sent to control modules J854 and J855to initiate full electrical motor tensioning of theseatbelts.Retainingring456 033When the electric motors operate, a driving plateis driven by toothed gearing. Two hooks extend,connecting the driving plate to the seatbeltretractor shaft. The seatbelt is retracted. Whenthe motors stop or reverse slightly, the hooksretract, releasing the seatbelt retractor ing456 039PistonIgniter16456 031

Front AirbagsA hybrid gas generator is used for the frontpassenger side airbag. The adaptivity function issimilar in both airbag modules.The 2011 Audi A8 has adaptive driver and frontpassenger airbags. An airbag module with asingle-stage solid fuel generator is located onthe driver’s side.Driver Airbag OperationDepending on the force of impact and thedriver’s seating position, J234 activates thedriver airbag discharge valve igniter, cutting theband and opening the additional discharge port.The airbag is “adapted” to the event seatingsituation of the occupants.In the event of a collision severe enough todeploy the airbags, Airbag Control Module J234activates Driver Airbag Igniter N95. The ignitioncharge then ignites the propellant charge. Whenthe gas pressure produced by combustion ofthe propellant charge exceeds a predeterminedlevel, a foil opens the discharge ports. Thisallows gas to flow through the metal filterand into the airbag. The airbag unfolds and isinflated.To provide adaptivity, an additional igniter,Driver Airbag Release Valve Igniter N490, and adischarge port are located on the back of the gasgenerator. This discharge port is kept closed inthe airbag by a band.The gas generator of the driver’s airbag ismounted on the steering wheel in a rubber ring,which minimizes idValve 7 N94MetalfilterMetalfilter456 062Driver AirbagIgniter N95DischargeportBandRetaininglugRetaininglugDriver AirbagRelease ValveIgniter N490456 005!456 010NoteThe method for attaching J234 to the steering wheel has changed from previous Audi A8 models. Refer tocurrent service repair literature for complete removal and installation instructions.17

Passenger AirbagThe 2011 Audi A8 for the North American marketwill come equipped with a two-stage adaptivefront passenger airbag. It uses a two-stagehybrid gas generator.Based on accident parameters, Airbag ControlModule J234 determines the time interval atwhich Front Passenger Airbag Igniter 2 N132 isactivated after Front Passenger Airbag Igniter 1N131.Front passenger two-stage hybrid gas generatorPropellantcharge 1Rupturedisc 1Rupturedisc 3Propellantcharge 2Rupturedisc 2Front PassengerAirbag Igniter 1N131Front PassengerAirbag Igniter 2N132Ignitioncharge 1!18456 009NoteWhen performing work on the airbag system, it is very important to pay close attention to the Cautions andWarnings given in current service repair literature.

Knee AirbagsDriver Knee Airbag Igniter N295Front Passenger Knee Airbag Igniter N296Ignited knee airbags protect occupants earlier inthe vehicle deceleration process. On the driver’sside, the knee airbag is integrated into thefootwell trim below the instrument panel. On thefront passenger side, the knee airbag is locatedbehind the glove box lid. Knee airbags areactivated in combination with the front airbags.Hybrid gas generators are used.View insideinstrumentpanelAirbagGasgenerator456 024LockingdeviceReleaseleverRetaininghookActive headrestraint solenoidMetalcoreEndposition456 007InitialpositionActive Head RestraintsDriver Active Head Restraint Solenoid N419and Front Passenger Active Head RestraintSolenoid N420If Airbag Control Module J234 detects a rearimpact where the force exceeds a predetermineddeployment threshold, the active head restraintson the front seats are activated in addition to thebelt tensioners.When J234 activates active head restraintsolenoids N419 and N420, the metal core isdrawn into the magnetic coil. Because theretaining hook no longer rests on the metal core,the front part of the head restraint is released.The head restraint moves approximately 1.96 in(50 mm) forward and approximately 0.78 in(20 mm) upward. A locking device prevents thefront part of the head restraint from returningto its original position.The active head restraints are reversible. Thelock can be released using the release lever,allowing the extended part of the head restraintto be pushed back again.For the complete procedure, refer to currentservice repair information.19

Active SafetyAudi Pre Sense Safety SystemThe new Audi pre sense system is available ina basic (standard) version and three expanded(optional) levels: front, rear, and plus.The Audi pre sense system networks variousin-car systems via individual control modulesand data bus systems. The associated controlmodules can evaluate the constant stream ofinformation and take action, as needed.Audi Pre Sense BasicThis system analyzes information from theElectronic Stability Program (ESP) sensors. Whenthe sensors signal maximum brake applicationor skidding, the ABS control module intervenes.Depending on the situation, it activates thehazard warning lights, closes the side windows/sunroof, and tensions the front seatbelts.Electric motors tension the seatbelts. If thesituation ends well, the seatbelts are releasedagain.Audi pre sense tensions the front seatbeltsevery time the car is started. The seatbelts aretensioned gently, but firmly enough that thedriver notices.Audi pre sense is unable to prevent accidents.It alerts the driver to hazardous situations andassists where technically feasible. However,drivers are entirely responsible for their drivingactions.Automatic Seatbelt TensionerIf the vehicle is traveling forward at a speed ofless than 9.3 mph (15 km/h), belt slack is reducedafter approximately 10 seconds. If seatbelts arenot being worn, the electric motors in the inertiareels will not be activated.If the front seat occupants are wearing theirseatbelts and a vehicle speed of approximately9.3 mph (15 km/h) is detected (forward travel),Left and Right Front Seat Belt Tensioner ControlModules J854 and J855 will activate the electricmotors in the inertia-reels of the seatbelts toreduce belt slack.Occupants can switch the automatic belttensioner (belt slack reduction) OFF and ON viathe MMI.CarRaiseHandbookSeats — driver’s seatEasy entryonAutomatic belt tensioneronRemote control keyonCar systemsSet individual456 07820

Longitudinal DynamicsIf the driver applies heavy braking, Left and RightFront Seat Belt Tensioner Control Modules J854and J855 will initiate partial s

The body of the 2011 Audi A8 employs the proven Aluminum Space Frame (ASF) design. The structure is a composite of aluminum extruded sections, aluminum diecastings, laser welded aluminum blanks, and sheet aluminum components. Audi uses 13 different grades of aluminum and several different grades of ultra high strength

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