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  5. Technical Features

Audi 2003 A8 Technical Features

Summary of 2003 A8

  • Page 1

    Service. For internal use only 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 audi a8 ´03 - technical features self study programme 282 ...

  • Page 2

    Complete vehicle information the design and operation of the audi a8 ´03 are described in the following self study programmes: other helpful information on the audi a8 ´03 can be found on the adjacent cd roms. Electrical system can data bus 2 ssp 283 – 6-speed automatic gearbox 09e in the audi a8 '0...

  • Page 3: Contents

    3 attention note new contents page introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 passenger protection system layout . . . . . . . . . . . . . . ...

  • Page 4: Introduction

    4 introduction the new audi a8 is designed to replace its predecessor of the same name which achieved a total production figure of 105,092 since its introduction in june 1994. This was the first standard saloon with aluminium body and epitomised a new philosophy in the luxury vehicle sector. The wei...

  • Page 5

    5 ssp282_025 as the audi flagship, the new audi a8 is intended to symbolise the product identity of the next audi generation. An uncompromising sporty character, clear- cut design, innovative technological systems and the highest possible quality level combine to provide an unforgettable driving exp...

  • Page 6: Body

    6 971 2944 5051 1136 714 125 brief outline body 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 d 1629 1894 1444 2028 1615 976.

  • Page 7

    7 body the audi a8 ´03 sets new standards in its class by combining lightweight construction with outstanding stability. This is achieved through the use of innovative audi space frame technology for the body design of the audi a8. The technical progress reflected by the unique body concept stems fr...

  • Page 8: Body

    8 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. The extruded section must be replaced in the...

  • Page 9

    9 rear end the rear end has been completely redeveloped. The two large central castings are the one connecting the sill panel/ longitudinal member and the c/d-pillar connecting element. Ssp282_032 the c/d-pillar connecting element (large upper casting) accommodates the suspension strut at the top an...

  • Page 10: Body

    10 body 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 downwards, overcoming the build-up of pressure occurring. On locking, a microswitch in the boot lid lock transmits a signal t...

  • Page 11

    11 in the event of manual boot lid actuation, the electric motor is disconnected by way of a magnetic coupling, thus permitting the boot lid to be moved by hand. On closing the boot lid, the drive is deactivated via a microswitch at the latch and the automatic closing aid activated. Pressing the but...

  • Page 12: Body

    12 body front doors the doors are made up of a combination of aluminium panels, aluminium sections and aluminium castings. Optimised rib geometry and wall thickness in the hinge and lock mounting castings formed the basis for ideal implementation of the lightweight construction concept. Rear doors l...

  • Page 13

    13 seats a new seat concept was developed for the audi a8 ´03. The basic seat features the following standard functions: – electric seat length, height and angle adjustment – electric backrest angle adjustment – front crash-active head restraints (refer to page 21) the basic seat can additionally be...

  • Page 14: Passenger Protection

    14 g 256 n251 g179 g180 n153 k145 airbag off n95/g85 n202 n154 n252 g 257 j533 n199 n201 g 283 g 284 n131 n200 t16 j623 j285/k75 e224 aus ein airbag j655 e24 e25 j234 n196 n198 n197 j393 j526 system layout passenger protection ssp282_068.

  • Page 15

    15 the wide range of sensors permits detection not only of head-on collision and side impact, but also of rear-end collisions. Use is made in the audi a8 ´03 of the 8.4e+ airbag system with the aim of attaining greater occupant safety whilst reducing the impact. This was achieved, for example, by wa...

  • Page 16: Passenger Protection

    16 15 j234 j655 1 2 e224 3 g283 g284 g179 n131 f138 n202 n199 n200 n201 n95 key e24 driver side belt switch e25 front passenger side belt switch e224 airbag disabling key switch, front passenger side f138 airbag coil connector/return spring with slip ring g179 side airbag crash sensor, driver side g...

  • Page 17

    17 4 5 6 7 g256 g257 e24 e25 n198 n251 n252 n153 n154 n196 n197 g180 n251 curtain airbag igniter, driver side n252 curtain airbag igniter, front passenger side colour code = input signal = output signal = positive supply = earth additional signals battery a (positive) positive connection to starter ...

  • Page 18: Passenger Protection

    18 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

    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 ...

  • Page 20: Passenger Protection

    20 passenger protection up-front sensors for the first time, use is made in the audi a8 ´03 of so-called up-front sensors. Ssp282_072 lateral acceleration sensors further acceleration sensors are located at the b and c-pillars. Ssp282_073 detection of rear-end collision rear-end collisions are detec...

  • Page 21

    21 active head restraints the front seats of the audi a8 ´03 are provided with active head restraints. With this system, the head restraints move forwards in the event of a rear-end collision to shorten the distance between head and restraint. Ssp282_082 the danger of cervical vertebrae injury is gr...

  • Page 22: Passenger Protection

    22 passenger protection 15 30 + - 31 j644 j655 4 3 b 1 2 a terminal pin input/output description 30, battery a input (screw connection) u bat. Term. 30/battery 87 b output (screw connection) output terminal 15 1 input (plug connection) positive power supply, interruptible vehicle earth 2 input (plug...

  • Page 23

    23 fitting location the battery cut-off relay is located in front of the battery. Triggering 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 ...

  • Page 24: Engine, Mechanics

    24 engine, mechanics 2000 4000 6000 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 technical data v8 4.2 l 5v engine engine code letters: bfm capacity: 3 bore: 84.5 mm stroke: 93.0 mm compression ratio: 11 : 1 power: 246 kw (335 hp) at 6,500 rpm torque: 430 nm a...

  • Page 25

    25 2000 4000 6000 260 280 300 320 340 360 380 400 420 440 460 40 60 80 100 120 140 160 180 200 220 240 v8 3.7 l 5v engine engine code letters: bfl capacity: 3 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 adjustment r...

  • Page 26: Engine, Mechanics

    26 engine, mechanics v8 5v 3.7 l/4.2 l engine the 3.7 l and 4.2 l v8 engines were adopted from the predecessor model with certain modifications. These modifications relate to the intake and exhaust systems and are described in the following. Design and operation are described in ssp 217. Variable-in...

  • Page 27

    27 – long intake path, 705 mm – changeover flap closed for high torque 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. This is a prereq...

  • Page 28: Engine, Mechanics

    28 engine, mechanics variable-intake manifold in 3.7 l engine operation of the 3-stage variable-intake manifold is described in ssp 217. Ssp282_017 this is the same 3-stage variable-intake manifold as previously fitted in the v8 engine. Due to the piston stroke of only 82.4 mm, three resonance tube ...

  • Page 29

    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. Furthermore, an additional intake air flap in the air cleaner is opened as a function of load at engine speeds as of ...

  • Page 30: Engine, Mechanics

    30 hot-film air-mass meter g70 engine speed sender g28 hall sender g40 (bank 2) and hall sender 2 g163 (bank 1) lambda probe g39 (bank 1) lambda probe ii g108 (bank 2) lambda probe after catalyst g130 (bank 1) lambda probe ii after catalyst g131 (bank 2) throttle valve control part j338 with throttl...

  • Page 31: Engine, Mechanics

    30 hot-film air-mass meter g70 engine speed sender g28 hall sender g40 (bank 2) and hall sender 2 g163 (bank 1) lambda probe g39 (bank 1) lambda probe ii g108 (bank 2) lambda probe after catalyst g130 (bank 1) lambda probe ii after catalyst g131 (bank 2) throttle valve control part j338 with throttl...

  • Page 32: Engine, Mechanics

    32 electrohydraulic torque reaction support engine, mechanics when the solenoid is deenergised, vibration causes the plastic ring with sheet metal ring and isolation diaphragm to oscillate as well. The moments are damped slightly and thus transmitted to a lesser extent to the body. As of an engine s...

  • Page 33

    33 thin-walled ceramic monoliths are used to improve cold starting behaviour. On environmental grounds, the centre silencer is fitted with long-fibre glass wool instead of basalt wool. A connecting pipe is located directly upstream of the centre silencer. This forms the joint between the two exhaust...

  • Page 34: Engine, Mechanics

    34 the tubing system for the tank breather at the filler pipe has been considerably simplified as compared to the predecessor model. With the exception of diesel vehicles, the pipe connections have been converted to quick- release couplings. A new feature is the use of a 2-stage delivery pump for ea...

  • Page 35

    35 the fuel is conveyed via the filler pipe into the right tank chamber (as viewed in direction of travel). The fuel passes via an additional overflow channel at the end of the filler pipe predominantly into the right pump reservoir. Use of the small overflow channel ensures that even small quantiti...

  • Page 36: Engine, Mechanics

    36 engine, mechanics function the main functions of the float-type rollover valve are as follows: – closing-off of pipe to filler neck in the event of rollover – closing in dynamic driving mode – closing by rising of float in valve in the event of a brief excess of fuel in the tank due to sloshing c...

  • Page 37

    37 the reservoirs with pumps and immersion tube senders rest on and are clipped to the bottom of the tank. Flanged covers provide access to the components. Single-stage pumps are used for diesel engines (common rail). On account of the higher viscosity of diesel fuel, pre-delivery (extraction from b...

  • Page 38: Engine, Mechanics

    38 engine, mechanics such pipe routing prevents dry running of a pump in critical driving situations such as cornering or if the vehicle is at an extreme angle. The return pipe is shared by both reservoirs. If one reservoir is full, the pipe is closed by a non-return valve and the entire return volu...

  • Page 39

    39 advantages: – longer service life thanks to noncontacting measurement system – protection against dirt and deposits – low contact currents tank senders 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 ...

  • Page 40: Engine, Mechanics

    40 engine, mechanics the fuel level is determined by way of a logical system of immersion tube and angle sender signals. A - low levels are determined exclusively by way of the angle sender measured values b - high levels are determined exclusively by way of the immersion tube sender measured values...

  • Page 41

    41 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 cont...

  • Page 42: Engine, Mechanics

    42 engine, mechanics sequence of operations 1 entry and start authorisation switch e415/ entry and start authorisation button e408 2 entry and start authorisation control unit j518 the entry and start authorisation control unit checks for authorisation – in the form of information on selector slide ...

  • Page 43

    43 d1 30 15 j329 j53 j695 j694 75x e415 n376 6x j623 j518 50r 50r 3 1 2 1 2 e408 stop start 58s 2 1 0 2 1 0 d1 inhibitor reading unit e408 entry and start authorisation button e415 entry and start authorisation switch j53 starter motor relay j329 terminal 15 voltage supply relay j518 entry and start...

  • Page 44: Engine, Mechanics

    44 engine, mechanics explanatory notes on internal control unit sequence chart request for starting (terminal 50 on from entry and start authorisation control unit j518) energises the two relays. Locking-in takes place during the initialisation phase of engine control unit j623. After initialisation...

  • Page 45: Gearbox

    45 two different versions are available: – 420 nm for the v8 5v 4.2 l or 3.7 l engine and – 600 nm for the v8 tdi 4.0 l or 6.0 l w12 engine to satisfy high comfort requirements, the audi a8 ´03 features a new 6-speed automatic gearbox capable of handling a high engine torque of max. 600 nm. Gearbox ...

  • Page 46: Gearbox

    46 highlights of automatic gearbox 09e 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. Use is made in this gearbox of a n...

  • Page 47

    47 the mechatronic system integrated into the gearbox housing is a new development, combining the hydraulic control unit, sensors, actuators and electronic gearbox control unit in a coordinated assembly. Ssp282_046 all data exchange with the vehicle periphery takes place via the drive system can, th...

  • Page 48: Gearbox

    48 selector lever/button kinematics to prevent inadvertent shifting into selector lever position "s", a change has been made to the selector lever kinematics such that switching to "s" involves pressing the button in the gearstick knob. A small gear mechanism is provided in the gearstick knob to red...

  • Page 49: Running Gear

    49 all axle components are new on account of the geometric and kinematic modifications as compared to the predecessor model, the air suspension and the weight reductions achieved. Front axle the familiar four-link front axle was retained for the audi a8 '03. A significant new feature is the air susp...

  • Page 50: Running Gear

    50 all axle components are new on account of the geometric and kinematic modifications as compared to the predecessor model, the air suspension and the weight reductions achieved. Rear axle highlights – use of air suspension in conjunction with electronically controlled damping – aluminium subframe ...

  • Page 51

    51 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 the control system makes allowance for t...

  • Page 52: Running Gear

    52 system layout running gear ssp282_054 design and operation of 4-level air suspension are described in ssp 292. Front information and display and operating unit control unit j685 front axle level sensors solenoid valve block rear axle level sensors pressure accumulator adaptive suspension control ...

  • Page 53

    53 the following functions are provided by the electric parking brake: – parking brake function – emergency braking function – holding function when driving off on a hill – brake pad wear indicator electric parking brake the brake pads are applied by way of a spindle mechanism. Gear unit and motor a...

  • Page 54: Running Gear

    54 driver convenience is further enhanced, as fewer accelerator and brake pedal operations are required. Speed restrictions and safety factors are reliably observed and the flow of traffic thus better regulated. Acc (adaptive cruise control) adaptive cruise control is a new system designed to assist...

  • Page 55

    55 radar sensor an adapter plate permits fitting and adjustment at a holder bolted to the centre of the bumper bracket. For details, refer to current workshop manual. Design sender and control unit are integrated into one housing - the distance regulation control unit j428. The entire assembly has t...

  • Page 56: Running Gear

    56 ssp282_061 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. Running gear the set speed is displayed by a bright red led in th...

  • Page 57

    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 permissib...

  • Page 58: Electrical System

    58 bus topology electrical system the increasing demand for additional functions and convenience in the vehicle calls for the use of ever more wide ranging electronics. The increased use of electronics also requires a new approach to data transfer between the individual control units. This also appl...

  • Page 59

    59 ssp282_063 telephone/ telematics control unit j526 front information display and operating unit control unit j523 rear dvd changer r162 telephone handset r37 control unit for rear left information display and operating unit j648 dsp control unit j525 navigation system control unit j401 tv tuner r...

  • Page 60: Electrical System

    60 local interconnect network 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 tm (wireless data bus) lin bus lin stands for local interconnect network. Local interconnect me...

  • Page 61

    61 media oriented systems transport r the name of this data bus system is derived from "media oriented systems transport (most) cooperation". This is an association formed by various motor vehicle manufacturers, their suppliers and software companies with a view to developing a standard high-speed d...

  • Page 62: Electrical System

    62 electrical system bluetooth tm bluetooth tm 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, wh...

  • Page 63

    63 vehicle electrical system a major factor in terms of vehicle reliability is one which is never even seen: the electrical system. Use is made for the audi a8 ´03 of a customer- specific one-piece modular wiring harness. "one-piece" means that power is supplied for all essential electrical function...

  • Page 64: Electrical System

    64 electrical system convenience and security electronics "advanced key" entry and start authorisation system "advanced key" can be taken to mean an "advanced locking and security system". It takes the form of a non-contacting key recognition system. With the "advanced key" package, the "vehicle unl...

  • Page 65

    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 the le mans r8) for manual shifting of the 6-speed tiptronic ® . The voice control option for radio, cd changer, telephone, navigati...

  • Page 66: Electrical System

    66 electrical system both in the modern business world and in the private domain, mobile information and entertainment are becoming ever more important. In other words, vehicle occupants are becoming increasingly interested in enjoying the benefits of modern media. Ssp282_090 infotainment dvd - vide...

  • Page 67

    67 ssp282_096 tp tmc tr. 12 10:56 d2 private with this in mind, the audi a8 ´03 is fitted with an infotainment system offering a wide range of modern media. Design and operation are described in ssp 293 - audi a8 ´03 infotainment. Memory source cd 1 manual sound dire straits - brothers in … forward.

  • Page 68: Electrical System

    68 electrical system the headlight in the audi a8 ´03 combines both design elements and innovative technology. Headlight versions: – basic halogen version h7 dynamic headlight range control is not necessary with halogen headlights. The air suspension provides compensation for static load statuses an...

  • Page 69

    69 light functions ssp282_087 adaptive light the additional reflector with a 35 w h8 halogen bulb is actuated as the situation requires to ensure earlier perception of other road users or obstacles. When reversing or parking, both adaptive lights are activated to provide the driver with a better ove...

  • Page 70: Electrical System

    70 electrical system 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. They appear neutral in colour when switched off. Led technology of...

  • Page 71

    71 rear lights ssp282_089 the newly designed rear lights are an ideal combination of design, function and ultra- modern technology. Light-emitting diodes are used for the tail light, brake light and turn signal indicator functions. Newly developed "high-performance" bulbs are employed for the lesser...

  • Page 72: Heating/air Conditioner

    72 an optional feature for the audi a8 ´03 is 4-zone climate control, enabling both driver and all passengers to make individual settings independently of the climate control level selected for the other occupants. Design and operation the air conditioning system represents a more advanced version o...

  • Page 73: Heating/air Conditioner

    73 74 a distinction is made between two air conditioner unit versions – 2-zone front and rear climate control – 4-zone front and rear climate control and three types of control and display unit – air conditioner control panel with no seat heating/ventilation – air conditioner control panel with seat...

  • Page 74

    Climatronic control unit j255 ssp282_100 rear climatronic control and display unit e265 air conditioner basic setting control heated rear window control front control panel activation/ deactivation seat ventilation control air distribution control – up – chest vent/centre – down left rotary control/...

  • Page 75

    75 3 3 6 auto 21,5 ° c 6 3 3 the current air conditioner settings are stored automatically and assigned to the appropriate remote control key. On vehicles with audi one-touch memory (optional), the current setting is also assigned to the corresponding fingerprint. Air conditioning system control via...

  • Page 76: Heating/air Conditioner

    76 blower unit/air routing as opposed to the predecessor model, the air conditioner features an additional evaporator outflow temperature sender g263. This is installed in the air duct downstream of the evaporator and constantly transmits the air temperature downstream of the evaporator to the clima...

  • Page 77

    77 v199 v68 v219 v102 v218 v108 g263 g151 ssp282_101 g150 v200 v107 v113 v71 recirculated-air flap defrost flap right vent indirect ventilation/ right right footwell flap rear right footwell flap cold-air flap/ centre vent rear right warm-air flap (4-zone system only) rear right cold-air flap (4-zon...

  • Page 78: Heating/air Conditioner

    78 electric rear additional heater an electric rear additional heater is fitted under each front seat in the rear climate control footwell air ducts. Heating/air conditioner a further advantage is that independent temperature regulation (heating) can be provided for the rear footwell with the 4-zone...

  • Page 79: Notes

    79 notes.

  • Page 80: Heating/air Conditioner

    80 heating/air conditioner ssp282_103 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 left/right vent temperature sender g150/g151 centre vent temperature se...

  • Page 81: Heating/air Conditioner

    80 heating/air conditioner ssp282_103 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 left/right vent temperature sender g150/g151 centre vent temperature se...

  • Page 82: Heating/air Conditioner

    82 humidity sender g355 heating/air conditioner at low ambient temperatures, when the windscreen is extremely cold, the top third is particularly susceptible to fogging. To cover this area, the humidity sender g355 is fitted in front of the base of the rear view mirror. The sender is designed to det...

  • Page 83

    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 elec...

  • Page 84: Heating/air Conditioner

    84 the buttons for the seat heating and ventilation options are integrated into the front and rear control and display units (refer to page 74). Climate-controlled seats with heating and ventilation function the audi a8 ´03 can be fitted with front and rear climate-controlled seats as optional equip...

  • Page 85

    85 comfort seat the seat heating and seat ventilation functions are not incorporated into automatic climate control mode. Seat climate control is achieved by way of integrated fans in the seat cushion and backrest. Air ducts in the seat padding convey the air warmed by the seat heating to the occupa...

  • Page 86: Heating/air Conditioner

    86 j126 fresh-air blower control unit j255 climatronic control unit j528 sunroof electronics control unit j533 data bus diagnostic interface n175 left heat regulation valve n176 right heat regulation valve n280 air conditioning system compressor regulating valve n340 humidity sender heater t16 16-pi...

  • Page 87

    M m m m m m m m m m m m m m m v50 n175 n176 g238 g65 g107 g348 g347 z43 z42 j126 v2 z45 g344 z46 g345 30 15 s s 15a 5a 75 s 25a 75 s 25a c20 s 20a n340 g355 j528 j533 s 10a 30 g89 g150 g151 g263 v221 v111 v110 v220 v102 v68 v109 v108 v199 v200 v107 v71 v113 j255 v42 g56 58s 58s g143 g113 g135 g318 g...

  • Page 88: Heating/air Conditioner

    88 z12 e265 s 20a 30 g178 31 in out g426 g427 v219 g349 g350 m v218 m j533 s 15a 30 s 5a 15 g95 s 5a 30 75 s 20a s 5a 75 z11 z10 v273 g177 g94 m m v271 j674 j675 t16 heating/air conditioner block diagram for rear air conditioner.

  • Page 89

    89 key e265 rear climatronic control and display unit g94 rear left seat temperature sensor g95 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 m...

  • Page 90: Heating/air Conditioner

    90 auxiliary heater/coolant additional heater an auxiliary heater is available as an option for all vehicle and engine versions. The auxiliary heater with petrol engines and additional heater with diesel engines are integrated into the engine coolant circuit. Vehicles with diesel engine are fitted w...

  • Page 91

    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. The energy management ...

  • Page 92: Heating/air Conditioner

    92 small coolant circuit with auxiliary heater the small coolant circuit employed with auxiliary heating is designed to ensure rapid warming of the passenger compartment. With the engine stopped, the coolant shutoff valve n279 switches to the small heating circuit until a defined temperature value h...

  • Page 93: Notes

    93 notes.

  • Page 94: Notes

    94 notes.

  • Page 96

    Service. For internal use only 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 audi a8 ´03 - technical features self study programme 282 ...