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Audi 2003 A8 Technical Features

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Service.
AUDI A8 ´03 - Technical Features
Self Study Programme 282
For internal use only

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Summary of Contents for Audi 2003 A8

  • Page 1 Service. AUDI A8 ´03 - Technical Features Self Study Programme 282 For internal use only...
  • Page 2 Complete vehicle information The design and operation of the Audi A8 ´03 are described in the following Self Study Programmes: SSP 283 – 6-speed automatic gearbox 09E in the Audi A8 '03 - Part 1 SSP 284 – 6-speed automatic gearbox 09E in the Audi A8 '03 - Part 2 SSP 285 –...

  • Page 3: Table Of Contents

    Contents Page Introduction ......... . 4 Body .

  • Page 4: Introduction

    The new Audi A8 is designed to replace its This body concept was further perfected in predecessor of the same name which achieved the Audi A2 and the design of the Audi A8 ´03 a total production figure of 105,092 since its reflects the experience gained from both introduction in June 1994.
  • Page 5 As the Audi flagship, the new Audi A8 is An uncompromising sporty character, clear- intended to symbolise the product identity of cut design, innovative technological systems the next Audi generation. and the highest possible quality level combine to provide an unforgettable driving experience.

  • Page 6: Body

    Body Brief outline 1629 1615 1894 2028 2944 1136 5051 SSP282_026 Kerb weight 1,780 kg Gross weight 2,380 kg Turning circle 12 m Luggage compartment volume approx. 500 l Tank capacity approx. 90 litres Drag coefficient 0.27 C...
  • Page 7 Body The Audi A8 ´03 sets new standards in its Based on the findings obtained from these class by combining lightweight construction vehicles, it was possible to further reduce the with outstanding stability. This is achieved number of body components and through the use of innovative Audi Space significantly increase the level of automation...
  • Page 8 Body A-pillar The A-pillar is made of two cast shells connected by rivets and welds. The shells enclose the sill panel at the bottom and the continuous roof frame at the top. SSP282_029 Sill panel Use is made for the sill panel of a 3-piece extruded section.
  • Page 9 Rear end The rear end has been completely The sill panel/longitudinal member redeveloped. The two large central castings connecting element is the largest casting. It are the one connecting the sill panel/ supports the entire rear sub-frame and links longitudinal member and the C/D-pillar the rear longitudinal member to the sill panel.
  • Page 10 Body Boot lid Foam encasing Electronic boot lid lock with microswitch SSP282_035 Motor for automatic Bowden Catch closing aid cable A standard feature is an automatic closing aid, which is actuated by a Bowden cable separately from the catch. After the latch has closed, a mechanism pulls the catch The drive unit is only encased in foam and downwards, overcoming the build-up of...
  • Page 11 Automatic boot lid Hinge mechanism (open) Boot lid control unit J605 Button in driver's door Button on boot lid Vehicle key SSP282_036 Pressing the button in the driver's door or on In the event of manual boot lid actuation, the the boot lid, or remote control actuation, electric motor is disconnected by way of a effects release and motor-driven opening of...
  • Page 12 Body Front doors The doors are made up of a combination of Door shell and door frame are connected at aluminium panels, aluminium sections and the door pre-assembly stage by means of aluminium castings. fitted bolts to ensure the accurate Optimised rib geometry and wall thickness in assignment of both components.
  • Page 13 Seat cushion fan area by 50 mm. A new seat concept was developed for the Extra features of sports and comfort seats: Audi A8 ´03. The basic seat features the following – Electric top 1/3 backrest adjustment standard functions: – Electric seat depth adjustment –...

  • Page 14: Passenger Protection

    Passenger Protection System layout G 283 G 284 K145 AIRBAG J623 J285/K75 E224 AIRBAG AUS EIN J533 N95/G85 N131 J234 J526 N199 N200 G180 G179 N154 N153 N201 N202 N252 N251 N196 N198 N197 G 256 G 257 J393 J655 SSP282_068...
  • Page 15 Use is made in the Audi A8 ´03 of the 8.4E+ The wide range of sensors permits detection airbag system with the aim of attaining greater not only of head-on collision and side impact, occupant safety whilst reducing the impact.

  • Page 16: Block Diagram

    Passenger Protection Block diagram G283 G284 G179 J655 E224 J234 F138 N131 N199 N200 N201 N202 Driver side belt switch J234 Airbag control unit Front passenger side belt switch J655 Battery cut-off relay E224 Airbag disabling key switch, front passenger side Driver side airbag igniter N131 Airbag igniter 1, front passenger side F138 Airbag coil connector/return spring...
  • Page 17 G180 G256 G257 N251 N252 N153 N154 N196 N198 N197 SSP282_069 Additional signals N251 Curtain airbag igniter, driver side Battery A (positive) N252 Curtain airbag igniter, front passenger side Positive connection to starter B and alternator C Terminal 58s Drive system CAN (High) Drive system CAN (Low) Colour code Crash signal...

  • Page 18: Safety Systems

    Passenger Protection Safety systems 2-stage front airbags The 2-stage triggering of the front airbags provides optimum restraint in crash situations at around 30 km/h. There is a separate firing pellet for each stage in the driver's and front passenger's airbag. These ignite successively at specified time intervals.
  • Page 19 Front passenger's airbag deactivation An optional feature of the Audi A8 ´03 is a new airbag disabling key switch for the front passenger's side E224. Two resistance paths are integrated into this switch to permit detection of individual faults. A fault in the key switch is indicated by flashing of the front passenger's side airbag...
  • Page 20 G283 and G284. Up-front sensors For the first time, use is made in the These take the form of two additional front- Audi A8 ´03 of so-called up-front sensors. end acceleration sensors on the right and left beneath the corresponding headlight. SSP282_072...
  • Page 21 Active head restraints The front seats of the Audi A8 ´03 are provided The danger of cervical vertebrae injury is with active head restraints. greatly diminished by reducing the relative With this system, the head restraints move acceleration between shoulder and head.
  • Page 22 Passenger Protection Battery cut-off relay J655 The battery cut-off relay is a battery isolating element designed to disconnect starter and alternator power from the electrical system in the event of a crash. Terminal Input/output Description 30, battery Input term. 30/battery bat.
  • Page 23 Fitting location The battery cut-off relay is located in front of the battery. Triggering SSP282_083 The airbag control unit J234 provides the battery cut-off element with the triggering command via a discrete wire. Triggering of this element by the airbag control unit causes a white panel to appear in the element window instead of a copper coil.

  • Page 24: Engine, Mechanics

    Engine, Mechanics Technical data V8 4.2 l 5V engine Engine code letters: Capacity: 4,172 cm Bore: 84.5 mm Stroke: 93.0 mm Compression ratio: 11 : 1 Power: 246 kW (335 hp) at 6,500 rpm Torque: 430 Nm at 3,500 rpm Camshaft 6000 2000...

  • Page 25: Technical Data Of V8 3.7 L 5V Engine

    V8 3.7 l 5V engine Engine code letters: Capacity: 3,697 cm Bore: 84.5 mm Stroke: 82.4 mm Compression ratio: 11 : 1 Power: 206 kW (280 hp) at 6,000 rpm Torque: 360 Nm at 3,750 rpm Camshaft 2000 4000 6000 adjustment range: 13°...
  • Page 26 Engine, Mechanics V8 5V 3.7 l/4.2 l engine The 3.7 l and 4.2 l V8 engines were adopted Design and operation are described in from the predecessor model with certain SSP 217. modifications. These modifications relate to the intake and exhaust systems and are described in the following.
  • Page 27 – Long intake path, 705 mm – Changeover flap closed for high torque SSP282_014 Each of the two splined shafts is fitted with four flaps per cylinder bank. The shape of the rubber-encased flaps ensures unimpeded air flow in the torque position and reliable power position sealing of the duct.
  • Page 28 Engine, Mechanics Variable-intake manifold in 3.7 l engine Changeover flap, stage 3 Intake air (inlet) Vacuum unit Changeover flap, stage 3 Injector mounts Changeover flap, stage 2 (open) Vacuum unit Changeover flap, stage 2 Resonance tube, cyl. 5 SSP282_017 (inlet end) This is the same 3-stage variable-intake Due to the piston stroke of only 82.4 mm, manifold as previously fitted in the V8 engine.
  • Page 29 Air cleaner A round filter is employed instead of a flat filter to achieve a larger filter surface area for more air throughput in view of the different amount of space available. SSP282_018 Furthermore, an additional intake air flap in the air cleaner is opened as a function of load at engine speeds as of 3,000 rpm to attain the large volume of air required at full throttle.

  • Page 30: System Layout

    Engine, Mechanics System layout Actuators/sensors Hot-film air-mass meter G70 Engine speed sender G28 Hall sender G40 (bank 2) and Hall sender 2 G163 (bank 1) Pedal position sender/accelerator pedal module with accelerator pedal position sender G79 and accelerator pedal position sender 2 G185 Lambda probe G39 (bank 1) Lambda probe II G108...
  • Page 31 Fuel pump relay J17 Fuel pump G6 Fuel pump II relay J49 Fuel pump G23 Engine control unit J623 Injectors N30, N31, N32, N33 (bank 1) Injectors N83, N84, N85, N86 (bank 2) Intake manifold changeover valve N156 and Intake manifold changeover valve 2 Steering N261 angle sender G85...

  • Page 32: Electrohydraulic Torque Reaction Support

    Engine, Mechanics Electrohydraulic torque reaction support Stress-free alignment of the torque reaction support is implemented by way of the lock nut. Lock nut Isolation diaphragm Shell Upper section of nozzle plate Top section Plastic ring with sheet metal ring Connecting pipe Solenoid Bellows cap...

  • Page 33: Exhaust System

    Exhaust system Exhaust manifold Lambda probe G39, cylinder bank 1 Two-stage catalytic converter Lambda probe after catalyst G130 Connecting pipe Lambda probe II G108, cylinder bank 2 Lambda probe II after catalyst G131 SSP282_028 With the 4.2 l and 3.7 l engines, the exhaust Thin-walled ceramic monoliths are used to system is of the dual-flow type.

  • Page 34: Fuel Tank

    Engine, Mechanics Fuel tank The fuel tank capacity is approximately The tubing system for the tank breather at the 90 litres. filler pipe has been considerably simplified as The basic unit consists of two plasma-welded compared to the predecessor model. With the stainless steel shells.
  • Page 35 Interior of fuel tank (filling) Float-type shutoff valve Filler pipe Breather pipe to filler pipe Reservoir Reservoir with pump unit, right with pump unit, left Baffle housing of expansion tank SSP282_006 Overflow channel The fuel is conveyed via the filler pipe into the Routing the filler pipe beneath the right tank chamber (as viewed in direction of longitudinal member means that the lowest...
  • Page 36 Engine, Mechanics Expansion tank Inlet pipe from tank filler neck Float-type rollover valve Breather pipe Suction jet pump intake connection Float-type shutoff valve SSP282_009 The expansion tank (capacity approx. 2 litres) Function consists of a plastic housing clipped to the upper shell of the tank.
  • Page 37 Two-stage fuel pumps Main stage delivery end Main stage suction end Return Overflow Main stage pump unit Reservoir Pre-stage pump unit Pre-stage suction end Pre-stage delivery end Fuel tank Main stage suction end SSP282_003 The two fuel pumps (petrol engine) are of the The reservoirs with pumps and immersion two-stage flow type.
  • Page 38 Engine, Mechanics Fuel system (hydraulics) Pressure regulator (4 bar) Fuel pump G23 Fuel pump G6 SSP282_005 Suction jet pump When the ignition is switched on (terminal 15), Such pipe routing prevents dry running of a the fuel pump G23 conveys a maximum pump in critical driving situations such as volume to the pressure regulator at the fuel cornering or if the vehicle is at an extreme...
  • Page 39 Tank senders Magnetically soft foil The fuel level is sensed by two immersion tube senders and two angle senders. A new feature is the design of the angle sender, which is equipped with a magnetically passive position sensor. The ceramic substrate is provided with 51 series-connected film resistors with individual pick-off.
  • Page 40 Engine, Mechanics Determining fuel level SSP282_004 The fuel level is determined by way of a The sender signals are evaluated by the dash logical system of immersion tube and angle panel insert. All senders are connected in sender signals. parallel. The wires are bunched beneath the fuel tank, a - Low levels are determined exclusively by thus enabling resistance measurements to be...

  • Page 41: Automatically Controlled Starting

    Automatically controlled starting The automatic start control is integrated into the engine control unit. A new feature is that starter control is no longer implemented by way of the ignition/ starter switch D (switching of terminal 50), but rather it is performed automatically by the engine control unit.
  • Page 42 Engine, Mechanics Sequence of operations 1 Entry and start authorisation switch E415/ The driver triggers a brief start signal entry and start authorisation button E408 (min. 20 ms) by turning the ignition key to start position or by pressing the entry and start authorisation button E408.
  • Page 43 Block diagram E415 N376 E408 2 1 0 2 1 0 STOP START J518 J623 SSP282_024 J329 J694 J695 Inhibitor reading unit J623 Engine control unit E408 Entry and start authorisation button J694 Terminal 75x voltage supply relay E415 Entry and start authorisation switch J695 Starter relay 2 Starter motor relay N376 Ignition key withdrawal lock magnet...
  • Page 44 Engine, Mechanics Explanatory notes on internal control unit sequence chart Request for starting (terminal 50 ON from After initialisation, the engine control unit entry and start authorisation control unit assumes further starter control tasks as described J518) energises the two relays. Locking-in under item 3.

  • Page 45: Gearbox

    Gearbox To satisfy high comfort requirements, the Two different versions are available: Audi A8 ´03 features a new 6-speed automatic gearbox capable of handling a high engine – 420 Nm for the V8 5V 4.2 l or torque of max. 600 Nm.
  • Page 46 Gearbox Highlights of automatic gearbox 09E (AL 600-6Q) The 6-speed planetary gearbox is based on the Lepelletier principle. This concept is characterised by harmonic gear ratio steps and the implementation of six forward gears and one reverse gear with only five selector elements.
  • Page 47 The mechatronic system integrated into the All data exchange with the vehicle periphery gearbox housing is a new development, takes place via the drive system CAN, thus combining the hydraulic control unit, reducing the number of vehicle periphery sensors, actuators and electronic gearbox interfaces to a minimum (11 pins) and at the control unit in a coordinated assembly.
  • Page 48 Gearbox In terms of the following functions, there are interesting new aspects to the shift mechanism in the new Audi A8 '03: – Shift mechanism kinematics – Ignition key removal lock – Selector lever lock – Selector lever lock emergency release –...

  • Page 49: Running Gear

    Front axle The familiar four-link front axle was retained All axle components are new on account of for the Audi A8 '03. the geometric and kinematic modifications as A significant new feature is the air compared to the predecessor model, the air...

  • Page 50: Rear Axle

    Rear axle The rear axle is a more advanced version of All axle components are new on account of the familiar Audi A8 trapezium-link axle. the geometric and kinematic modifications as compared to the predecessor model, the air suspension and the weight reductions achieved.

  • Page 51: 4-Level Air Suspension

    4-level air suspension The introduction of the Audi A8 ´03 is accompanied by a system featuring new technical details and functions. The major differences with respect to the familiar Audi ® allroad quattro system are as follows: EDC instead of PDC damping...

  • Page 52: System Layout

    Running Gear System layout Rear axle acceleration sensors Control unit with display in dash panel insert J285 Rear axle Front information and air suspension struts display and operating unit control unit J685 Pressure accumulator Adaptive suspension control unit Front axle air suspension struts SSP282_054 Rear axle...

  • Page 53: Electric Parking Brake

    Electric parking brake The brake pads are applied by way of a The following functions are provided by the spindle mechanism. electric parking brake: Gear unit and motor are flanged to the brake – Parking brake function caliper. – Emergency braking function –...

  • Page 54: Adaptive Cruise Control

    Running Gear ACC (Adaptive Cruise Control) Adaptive Cruise Control is a new system Driver convenience is further enhanced, as designed to assist drivers and offers a much fewer accelerator and brake pedal operations wider range of functions than the are required. Speed restrictions and safety conventional Tempomat.
  • Page 55 ACC system limits Radar sensor – ACC is designed to assist the driver and An adapter plate permits fitting and is not a safety system. adjustment at a holder bolted to the centre of – ACC is not a fully autonomous driving the bumper bracket.
  • Page 56 Running Gear Setting desired speed The desired speed is the maximum speed to be controlled by the ACC on an open road (corresponds to cruise control system function). Pressing the SET button stores the current speed as desired speed. SSP282_061 The set speed is displayed by a bright red LED in the speedometer rim and the "ACC active"...
  • Page 57 Setting desired distance The desired distance from the vehicle in front can be set by the driver in four stages. The distance set by the ACC is governed by the respective vehicle speed. The distance increases with increasing vehicle speed. The minimum setting ensures compliance with the permissible safety distance when travelling at a constant speed in traffic.

  • Page 58: Electrical System

    The increased use of electronics also requires a new approach to data transfer between the individual control units. This also applies to the Audi A8 ´03, in which more than 70 control units have to communicate. Dash panel insert CAN...
  • Page 59 Bluetooth Telephone Telephone/ Rear DVD changer telematics control handset R162 unit J526 Control unit for rear right Control unit for rear information display left and operating information display unit J649 and operating unit J648 Front information display and operating unit control unit J523 DSP control unit J525 Navigation system...
  • Page 60 Electrical System The familiar CAN bus (two-wire bus) is supplemented by the following bus systems: – LIN bus (single-wire data bus) – MOST bus (optical data bus) – Bluetooth (wireless data bus) LIN bus LIN stands for Local Interconnect Network. Local Interconnect means that all control units are located within a limited structural space (e.g.
  • Page 61 (MOST) Cooperation". This is an association systems, use has been made for the first time formed by various motor vehicle in the Audi A8 ´03 of an optical data bus manufacturers, their suppliers and software system. companies with a view to developing a standard high-speed data transfer system.
  • Page 62 Electrical System Bluetooth Bluetooth is an internationally standardised remote control data interface. It permits control or monitoring of even minute units using radio waves. The primary aim when developing this new type of interface was to create a wireless alternative to cable links, which used to be susceptible to interference and inconvenient and frequently featured incompatible connectors.
  • Page 63 Its advantages as compared to a copper Use is made for the Audi A8 ´03 of a customer- conductor are its insusceptibility to specific one-piece modular wiring harness. electromagnetic interference, a high "One-piece"...

  • Page 64: Convenience And Security Electronics

    "Advanced Key" entry and start authorisation system Design and operation are described in SSP 287 – Audi A8 ´03 Electrical "Advanced Key" can be taken to mean an Components. "advanced locking and security system". It takes the form of a non-contacting key In addition, the driver can start the engine recognition system.
  • Page 65 Multifunction steering wheel A new multifunction steering wheel has been introduced as standard. This is equipped with special paddles (as used in formula 1 and for Dash panel insert display the Le Mans R8) for manual shifting of the ® 6-speed Tiptronic .
  • Page 66 Electrical System Infotainment DVD - Video DAB - Digital radio Telephone Telematics Central display and control TV reception CD/DVD navigation Internet Email SSP282_090 Minidisc/CD audio Both in the modern business world and in the In other words, vehicle occupants are becoming private domain, mobile information and increasingly interested in enjoying the benefits of entertainment are becoming ever more...
  • Page 67 With this in mind, the Audi A8 ´03 is fitted with an infotainment system offering a wide range of modern media. Memory CD 1 Source Dire Straits - Brothers in … Forward Tr. 12 10:56 Manual TP TMC D2 Private...

  • Page 68: Lighting System

    Headlight flasher for adaptive light (Bi-Xenon/D2S - gas-discharge lamp) (H7/55 W bulb) The headlight in the Audi A8 ´03 combines both Both bi-xenon versions feature an ellipsoid design elements and innovative technology. module with a moving screen to achieve both dipped beam and main beam with xenon light.
  • Page 69 The optional headlights with adaptive light function are a clearly visible innovative feature in the Audi A8 ´03. To implement this function, the headlights are provided with an additional reflector between dipped beam and main beam. SSP282_092 Light functions Adaptive light...
  • Page 70 SSP 288 – Audi A8 ´03 Distributed Functions. Side lights This is the first Audi vehicle to be fitted with LED-type lights. The individual LEDs are fitted in a graduated arrangement under a transparent glass lens and give off a yellow light when switched on.
  • Page 71 The high-level third brake light also features LEDs. Interior lighting In addition to the usual interior, reading and door lights, the new Audi A8 also features new "ambiente" and door contour lights with variable functions depending on the lighting profile selected.

  • Page 72: Heating/Air Conditioner

    Heating/Air Conditioner Design and operation The air conditioning system represents a An optional feature for the Audi A8 ´03 is more advanced version of the concept 4-zone climate control, enabling both driver employed in the Audi A8 predecessor model and all passengers to make individual...

  • Page 73: Operating Principle

    CAN bus. using fingerprint recognition. If fingerprint recognition has been implemented, this has priority over key recognition (refer also to SSP 287 – Audi A8 ´03 Electrical Components). Personalised settings The following settings can be made for each The electrically heated windscreen is only...
  • Page 74 Climatronic control unit J255 Air conditioner defrost Reset to basic setting/ and electrically heated automatic mode windscreen Seat heating control Temperature sensor with blower Driver's side Passenger's side Blower control control panel control panel Left rotary control/pushbutton Rotary control +/- for –...
  • Page 75 The current air conditioner settings are stored altered with the driver's/front passenger's automatically and assigned to the control knob on the Climatronic control unit. appropriate remote control key. On vehicles with Audi one-touch memory (optional), the current setting is also assigned to the corresponding fingerprint.

  • Page 76: Blower Unit/Air Routing

    Heating/Air Conditioner Blower unit/air routing As opposed to the predecessor model, the air conditioner features an additional evaporator outflow temperature sender G263. This is When replacing control motors, attention installed in the air duct downstream of the must be paid to the assignment of the evaporator and constantly transmits the air flaps in the cam plate guides.
  • Page 77 Recirculated-air flap Fresh-air/air-flow flap G263 Defrost flap Right vent G151 V113 Indirect ventilation/left V107 V199 Left vent Indirect ventilation/ right G150 Right footwell flap V200 Rear right footwell flap V219 Cold-air flap/ V102 V108 centre vent Left footwell V218 flap Rear left footwell Rear right warm-air flap (4-zone system only)
  • Page 78 Heating/Air Conditioner Electric rear additional heater An electric rear additional heater is fitted under each front seat in the rear climate control footwell air ducts. SSP282_102 Operation Following a cold start or at low ambient A further advantage is that independent temperatures, there is insufficient waste heat temperature regulation (heating) can be in the coolant to warm the rear of the vehicle...
  • Page 79 Notes...

  • Page 80: System Layout

    Heating/Air Conditioner System layout Fresh-air intake duct temperature sensor G89 Flap control motor potentiometers G92, G113, G135, G136, G137, G138, G139, G140, G143, G317, G318, G349, G350, G351, G352 Air quality sensor G238 Humidity sender G355 Humidity sender heater N340 Left/right vent temperature sender G150/G151 Centre vent temperature...
  • Page 81 Control unit with display Front information display and in dash panel insert J285 operating unit control unit J523 Front information and display and MOST bus operating unit control unit J685 Diagnosis CAN Radiator fan control unit J293 Data bus diagnostic Engine control unit J623 interface J533 Drive system CAN...
  • Page 82 Heating/Air Conditioner Humidity sender G355 SSP282_104 At low ambient temperatures, when the The sender data enable the air conditioning windscreen is extremely cold, the top third is system to detect potential misting of the particularly susceptible to fogging. windscreen in good time. To cover this area, the humidity sender G355 Before water vapour from the air in the is fitted in front of the base of the rear view...
  • Page 83 Operation Measurement is performed by way of a special capacitor which can absorb water vapour. The water absorbed produces a change in the electrical properties and thus the capacitance of the capacitor. The capacitance measurement thus provides information on the humidity level. The sender electronics convert the measured capacitance into a voltage signal.
  • Page 84 Heating/Air Conditioner Climate-controlled seats with heating and ventilation function The Audi A8 ´03 can be fitted with front and The buttons for the seat heating and rear climate-controlled seats as optional ventilation options are integrated into the equipment. These seats offer a combination...
  • Page 85 Comfort seat Backrest carbon heating mats Fan in backrest Side bolster carbon heating mat SSP282_108 Air ducts in seat padding Fan in seat cushion Seat cushion carbon heating mats Seat climate control is achieved by way of The seat heating and seat ventilation integrated fans in the seat cushion and functions are not incorporated into backrest.

  • Page 86: Block Diagram For Front Air Conditioner

    Heating/Air Conditioner Block diagram for front air conditioner Solar cells J126 Fresh-air blower control unit J255 Climatronic control unit Dash panel temperature sensor J528 Sunroof electronics control unit High-pressure sender J533 Data bus diagnostic interface Fresh-air intake duct temperature sensor N175 Left heat regulation valve Temperature flap control motor...
  • Page 87 N340 G355 G344 Z46 G345 N175 N176 G238 G107 G348 G347 J126 G191 J533 J528 J255 G263 G151 G150 V113 G143 G113 V107 G135 V200 G318 V199 G317 V108 G139 V109 G140 V102 G138 V220 G351 V110 G136 V111 G137 V221 G352 N280...

  • Page 88: Block Diagram For Rear Air Conditioner

    Heating/Air Conditioner Block diagram for rear air conditioner V271 V273 G177 G178 J674 J675 E265 J533 V219 G350 V218 G349 G427 G426...
  • Page 89 E265 Rear Climatronic control and display unit V272 V270 Rear left seat temperature sensor Rear right seat temperature sensor G177 Driver side rear seat occupied sensor G178 Front passenger side rear seat occupied sensor G349 Positioning motor potentiometer for rear left vent G350 Positioning motor potentiometer for rear right vent...
  • Page 90 Operation with cut-in by way of remote control or timer In the Audi A8 ´03, the auxiliary heater is activated by the air conditioner. The heated coolant is initially supplied to the passenger compartment (primarily auxiliary heater mode).
  • Page 91 4.2 Auxiliary heating sequence The level of fuel in the tank is interrogated. If the fuel tank is "empty", the auxiliary heating function is not permitted and the auxiliary heater symbol in the dash panel insert goes out. "Empty" roughly corresponds to the red display zone.
  • Page 92 Design and operation are described in warming of the passenger compartment. SSP 267 – The 6.0 l W12 engine in the Audi A8 - Part 1. With the engine stopped, the coolant shutoff valve N279 switches to the small heating circuit until a defined temperature value has...
  • Page 93 Notes...
  • Page 94 Notes...
  • Page 96 All rights reserved. Subject to technical modification. Copyright* 2002 AUDI AG, Ingolstadt Department I/VK-35 D-85045 Ingolstadt Fax 0841/89-36367 000.2811.02.20 Technical status as at 09/02 Printed in Germany...

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