323 Vorsprung durch Technik www.audi.co.uk Service Training Audi A6´05 Self-Study Programme 323 All rights reserved. Subject to technical change. Copyright AUDI AG I/VK-35 Service.training@audi.de Fax +49-841/89-36367 AUDI AG D-85045 Ingolstadt Technical release 01/04 Printed in Germany A04.5S00.06.
Preface The new Audi A6 – the most progressive vehicle takes the lead Design and performance are the main driving elements on its way to the top position. Furthermore, the new Audi A6 embodies the consequent continuation of the familiar Audi brand values, sports appeal, progressiveness and intrinsic quality, which are evident in the fourth generation of this sporty business limousine.
Self-study programmes for the Audi A6´05 SSP 323 Audi A6´05 – – – – Introduction to the vehicle Body technology Passenger protection Air conditioning Order No.: A04.5S00.06.20 323_057 SSP 324 Audi A6´05 Chassis – – – – – Front axle technology Rear axle technology Steering system ESP Electromechanical parking brake EPB Order No.: A04.5S00.07.20 323_058 SSP 325 Audi A6 ´05 Engines and Gears – – – – – 3.0 V6 TDI Common Rail 3.
Contents Chapter 1 Introduction Product highlights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 3 Passenger protection Safety system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Airbag control unit J234 . . . . . . . . . . . . .
Contents Chaper 2 Body Body shell / connection technology Materials . . . . . . . . . . . . . . . . . . . . . . . . Blanks . . . . . . . . . . . . . . . . . . . . . . . . . . Assemblies . . . . . . . . . . . . . . . . . . . . . . Bumpers . . . . . . . . . . . . . . . . . . . . . . . . Trailer coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction Product highlights The product features which support the new Audi A6´05 on its way to the top, can be summarised as follows: One wing is the design, the other wing is the car’s performance.
Dimensions The new Audi A6´05 impresses with its imposing external dimensions. The vehicle length has been increased to 4.92 m, which corresponds to an increase of 12 cm compared to its predecessor. The vehicle width has been increased by 4.5 cm to 1.86 m. The height of the new A6´05 has been increased by 0.8 cm to 1.46 m. The new Audi A6´05 has grown. For the dimensions, please refer to the diagrams.
Body Body shell / connection technology The main objectives during the development of the new Audi A6 body design were the realization of high passive safety characteristics and improved rigidity values as a precondition for optimizing vibration damping characteristics. In spite of the greater demands compared with the previous model, the body weight has been kept at the same level. 323_001 A further task during the body development process is to minimize the number of necessary body versions.
In addition to classic resistance spot welding, the following connecting techniques are used on the new A6´05 body shell: – Spot welding bonding – Punch riveting – Clinching (bonnet & rear opening hood) – Laser soldering – Laser welding – as well as MIG soldering Spot welding bonding, using a high-strength structural adhesive, is used for particularly crash-relevant and rigidity determining connections (length of the bonded seam factor 3 compared with predecessor).
Body Materials In addition to conventional deep-drawing steels, the following materials are used in the body structure of the new Audi A6´05: – High tensile sheet steel – Special sheet steel – Aluminium sheets – Aluminium extruded sections and – Plastic-ribbed deep-drawing steel component (hybrid component) High tensile steels (180 - 300 N/mm²) Dual-phase steels (340 - 500 N/mm²) Weight percentage of high-tensile steel sheets Total: 45 % Upper section: 42.3 % Lower section: 46.
High-tensile steel sheets are used especially in areas which require strengthening and greater impact resistance. Special steel sheets are also used in the body structure, e.g. front wheelhouse cross-member. The engine bonnet and front mudguards are made of aluminium. In addition to the add-on parts in the shell, aluminium sheets are used in the structure for large-area components which are not subject to excessive stress.
Body Blanks Blanks with different wall thicknesses and material qualities are used to realize a stress-adapted material distribution for large-area components which are subject to high stress.
Tailored-rolled blanks, which have variable rolled wall thicknesses, have particular advantages. They can be used to produce continuous material thickness transitions which meet the local stress conditions. This technique is used to optimize the front longitudinal member structure. In total, a weight reduction of 8 kg (without add-on parts) was realized through the material selection being adapted to the respective stress conditions.
Body Assemblies Plenum chamber One application area for special steel is the chassis connection in the proximity of the spring and shock absorber seat. It was possible to reduce the wall thickness of the respective parts from 2.5 to 1.4 mm. The resulting loss of local rigidity was offset by creating an optimized profile. In addition, a tailored blank is fitted in the plenum chamber. This ensures the highest possible energy absorption in the event of a crash.
B-pillar Due to the increased requirements regarding the strength of the B-pillar, a combination of different materials is used. – front inner side section (high tensile steels) – rear inner side section, tailored blank (dual-phase steels, high tensile steels) t = 1.35 mm and 0.
Body Bumpers Front bumper The bumper on the new Audi A6´05 is painted in the colour of the car. It comprises the following components: – Coating – Top cover – Towing lug cover – Radiator grille with chrome frame – Fog lamps – Side air inlet grilles – Bumper support The number plate in the radiator grille is integrated stylishly and harmoniously within the overall design.
Rear bumper The rear bumper assembly comprises the coating, spoiler, towing lug cover and closing part components. It is mounted on the vehicle by means of fixed guides on the body. The bumper support and the bracket for the bumper support are made of aluminium and are produced by extrusion moulding. Compared to the previous model, the joints on the A6´05 have been noticeably reduced.
Body Control unit for trailer detection J345 Arrangement in the vehicle The basic function of trailer detector control unit J345 corresponds to the control unit which has already been in use since the 2001 Audi A4. To be used in the Audi A6´05, it was upgraded by the control function for the swivelling trailer coupling. It now has the additional task of detecting the locking status of the mechanically swivelling trailer coupling and indicating this to the driver.
On pulling the handwheel in the boot, the contact switch on handwheel F354 is closed. On turning the handwheel, the locking bolt on the trailer coupling is unlocked mechanically by a Bowden cable and the contact switch on locking bolt F355 opens. After being unlocked, the trailer coupling can be swivelled out/in mechanically. After being swivelled, it is automatically locked by spring power. The contact switches return to their initial position.
Passenger protection Safety system A top-level safety system: The performance target is to increase the existing high safety level of the current Audi fleet. The compliance with current laws and the completion User tests, in which the new Audi A6´05 was to gain a top position in the rating scheme, were only a part of the extensive safety requirements. In many cases, additional Audi in-house requirements increase the requirements which have to be met by the development team.
G284 G283 K145 PASSENGER AIRBAG OFF J623 J285 K75 / K19 AIRBAG E224 AUS EIN T16 J533 N95 / N250 N131 / N132 G179 J234 N199 E24 G180 E25 G128 N200 N252 N251 N154 N153 G256 G257 J393 J655 326_002 J234 J285 J393 J533 J623 J655 Airbag control unit Control unit in dash panel insert Central control unit for convenience system Data bus diagnosis interface Engine control unit Battery cut-off relay K19 K75 K145 Warning lamp for belt warning Airbag warning lamp Airbag warning lamp, front p
Passenger protection Airbag control unit J234 The task of the airbag electronics is to detect vehicle deceleration and evaluate it so that a collision is reliably detected. The control unit can detect frontal, side and tail accidents. In addition, the electronics also have the task of activating the respective restraint systems (airbags / belt tensioners) depending on the type of collision and its severity and activating the Crash output.
Airbag warning lamp K75 The airbag warning lamp, which is located in dash panel insert J285, is triggered via the bus CAN. If there is no data message from the airbag control unit, the warning lamp is automatically switched on from the dash panel insert. Rear crash detection In the event of a rear-end crash, the airbag control unit evaluates the information from the internal crash sensor and the crash sensors for front airbags G283 and G284.
Passenger protection Sensors Crash sensor (in the control unit) The acceleration sensors are arranged in such a way that both deceleration in the vehicle's longitudinal axis (x-axis) and deceleration in the vehicle's transverse axis (y-axis) are detected. Safety switch 326_015 (in the control unit) The mechanical safing sensor in the airbag control unit for the Audi A6‘05 has been replaced by a micromechanical acceleration sensor.
Crash sensors for side airbag, rear, G256 and G257 (C-pillar) Both crash sensors for side airbag G256 and G257, which are fitted near the C-pillar (left and right), are conventional acceleration sensors, which were already used for the previous Audi A6 model. How the crash sensors work A crash sensor essentially comprises a housing, evaluation electronics and a micro-mechanical acceleration sensor. Basically, the acceleration sensor is structured like a capacitor. Some of the capacitor plates are fixed.
Passenger protection Belt warning The new Audi A6´05 includes a belt warning function for both driver and passenger. After switching on the ignition, the driver's belt lock switch and the front passenger's belt lock switch (in conjunction) with the seat occupation sensor on the front passenger side is evaluated by the airbag control unit. The control unit recognizes whether the front passenger seat is occupied on the basis of the resistance values from the seat occupied sensor.
Airbag Driver airbag N95 and N250 A two-stage gas generator is used as the driver's airbag. The radial opening of the airbag and the delayed ignition of the propelling charges reduce the loads acting on the driver when the car crashes. Depending on the seriousness and type of accident, the time lapse between the two ignitions can be approx. 5 ms to 50 ms.
Passenger protection Front passenger airbag N131 and N132 Like the driver airbag, the passenger airbag also comes with a two-stage gas generator. In contrast to the driver's airbag, the gas generator in the front passenger airbag operates according to the hybrid gas technique. The gas generator comprises two pyrotechnical propelling charges and a compressed gas bottle. The airbag control unit ignites the first propelling charge.
Propelling charge I is ignited 326_021 Propelling charge I burns off Piston opens the gas cylinder Gas mixes Gas fills the airbag 326_022 Propelling charge II is ignited and burns off 326_023 29
Passenger protection Side airbags N199 and N200 The side airbags have the same design and function as those fitted in other Audi models. However, they have been adapted to the new Audi A6‘05. Vehicles for the North American market are equipped with side airbags (front), which are adapted to meet the specific market requirements.
Key switch for disabling airbag, front passenger side E224 A key switch as shown in the adjacent block diagram is used to deactivate the front passenger airbag. Deactivation of the front passenger airbag is indicated by the airbag warning lamp, front passenger side, off (K145) (PASSENGER AIRBAG OFF) lighting up. The layout of the four resistors, of which two are always connected in series, ensures correct detection of the switch position.
Passenger protection Belt switches E24 and E25 (in the belt locks) A belt lock interrogation procedure is planned for the driver / front passenger belt lock. The switch position can be determined by means of a resistance measurement. The measured resistance value tells the airbag control unit whether the safety belt has been fastened.
Active headrests Active headrests are used on the front seats in the Audi A6’05. With this system, the headrests move forward in the event of a rear-impact collision in order to reduce the distance between the head and the headrest. Reducing the relative acceleration between shoulder and head significantly reduces the risk of whiplash injuries. A blocking of the mechanics in the event of a frontal impact, as in the case of the Audi A8‘03, is not necessary, due to the lower mass of the head restraints.
Passenger protection Battery cut-off relay J655 The Audi A6‘05, like the Audi A8‘03, will also be equipped with the battery cut-off function in the event of a crash. The battery cut-off relay disconnects the starter and generator lines from the vehicle's battery (located in the boot) in the event of a crash. This avoids short-circuits, which could result in the vehicle catching fire.
30 15 5 4 3 1 A + J655 - B 2 31 326_018 Pin Terminal Input / output Description A 30 input (screw-type terminal) Battery + B 87 output (screw-type terminal) Output and starter 1 15 input (clamp-type terminal) Switched + 2 31 input (clamp-type terminal) Chassis ground 3 Crash signal input (clamp-type terminal) Activation from airbag control unit J234 4 Diagnosis Input and output (clamp-type terminal) Diagnosis line from airbag control unit J234 5 30 output (screw-type ter
Passenger protection Seat occupied recognition, not for USA Seat cushions Seat occupied sensor, front passenger side, G128 is a plastic foil, which covers the rear part of the front passenger seat. It consists of several individual pressure sensors. This ensures that the relevant part of the seat is sensed. The seat occupied sensor, front passenger side, reacts to pressure and changes its resistance, depending on the load.
Seat occupied recognition for US American market A separate system was developed in order to meet the legal requirements in this country. The system is responsible for deactivating the passenger’s front airbag in certain circumstances. If the front passenger seat is unoccupied or if a child seat is detected, the front passenger airbag is switched off by the airbag control unit.
Passenger protection Pressure sensor for seat occupied recognition G452 Pressure sensor for seat occupied recognition G452 is connected to the mat for seat occupied recognition by means of a hose. The mat, which is filled with a silicone-like gel is fitted below the seat cushion. If the front passenger seat is occupied, pressure is applied to this mat via the seat cushion. Pressure sensor for seat occupied recognition G452 generates an analogue voltage signal based on this pressure.
Wearing belt recognition switch E24 and E25 The wearing belt recognition switch is fitted directly in the belt lock. Two resistors are integrated within the switch. The measurement is effected via one or both of the resistors, depending on the switch position. The airbag control unit recognizes that the safety belt has been put on by means of the measured resistance.
Passenger protection Seat occupied recognition control unit J706 The control unit evaluates the signals coming from the pressure sensor and the belt force sensor. The seat occupied recognition control unit uses the information it receives from the seat belt force sensor to monitor the tensile force acting on the safety belt. The voltage signal from the pressure sensor can be used to specify the weight of the load on the front passenger seat. If the load is under approx.
Data exchange between the seat occupied recognition control unit and other vehicle systems is effected via the airbag control unit (by means of the LIN bus). The airbag control unit is thus the master control unit and the seat occupied recognition control unit (J706) the slave. The Diagnosis function is effected via the airbag control unit. The positions of the installed components are fixed and must never be changed. This also applies to individual system components.
Diagnosis Diagnosis As in the case of the Audi A8´03 and Audi A3´04, communication in the Audi A6´05 between the VAS tester and the vehicle is effected via CAN-Bus, CAN-Diagnosis. The main Diagnosis modification is the Diagnosis tester online connection. An adaptation of components belonging to the immobilizer or interrogation of the radio code, is only possible when the tester is directly connected to the company's ”FAZIT” database. Secret numbers are thus no longer disclosed.
VAS 5051 The VAS 5051 A tester will be replaced by the VAS 5051 B in 2004. The hardware and design of the VAS 5051 have been revised and updated. The 15" screen is the most noticeable feature of the VAS 5051 B. The main objective of the revision was being able to use it on the existing instrument waggon and with the existing test cables. M esst echnik DSO 0.5V/O iv.= N orm alBetrieb Trigger feh lt! Standbild 1m s/O iv.= KanalA KanalB 0 Trigger-M ode M ess-M ode 0 0.5V/O iv.= 0.
Diagnosis VAS 5053/20 The VAS 5053/20 wireless Diagnosis interface permits wireless communication between the Diagnosis socket in the vehicle and the VAS 5051 B, VAS 5052 and VAS 5053 Diagnosis testers. VAS 50 52 / 20 Messtechnik DSO 0.5V/Oiv.= Normal Betrieb Trigger fehlt ! Standbild 1ms/Oiv.= Kanal A Kanal B 0 Trigger-Mode Mess-Mode 0 0.5V/Oiv.= 0.
Recording the working time using the VAS 5051/5052 From the basic CD 6.0 onwards, the actual working time in the ”Guided fault finding” and ”Guided functions” functions is logged by the tester and indicated in time units under ”Diagnosis time” in the Diagnosis log print-out. The time required to uncover or remove and install components in the scope of the guided fault finding process is not recorded by the tester. Workshop code: 02211 123 12312 Version: Basic V06.02.00 19/06/2003 Audi V06.50.
Engine / Gearbox Overview of available engine / gearbox combinations V6 3.0l TDI V6 3.2l FSI V8 4.2l 2.
Reference: For information on the engines and gearboxes, refer to SSP 325 0A3/450Nm 09L/to 450Nm 01J/330Nm 01X/02Xqu 330Nm 09L/to 450Nm 01J/330Nm 01X/02Xqu 330Nm 47
Chassis Overview The basic version of the Audi A6´05 is equipped with a steel spring chassis. There are three different types of running gear: Normal chassis: Sports-style running gear: Designation 1BA Designation: 1BE, vehicle trim is positioned 20 mm lower than on the normal running gear Bad road chassis: Designation 1BR, vehicle trim position raised by 13 mm compared to the normal chassis Front axle The well-known four-link front axle also used in the new Audi A6‘05.
Rear axle The rear axle represents a further development of the trapezoid link axle, with which you may be familiar from the A4’00. Because of the geometric and kinematic changes compared with the predecessor vehicle and the use of the trapezoid link axle, all axle components are new parts. The axle struts are now longer compared with the A4`00 in order to guarantee a larger toe width.
Chassis Wheel brake Front-axle overview Engine 3.0 litre V6 TDI 3.2 litre V6 FSI 4.2 litre V8 MPI Minimum wheel size 16” 16” 17” Brake type FNR-G 60 16” FNR-G 60 16” FNR-G 60 17” Number of pistons 2 2 2 Piston diameter (mm) 60 60 60 Brake disc diameter (mm) x thickness (mm) 321 x 30 Ventilated 321 x 30 Ventilated 347 x 30 Ventilated Engine 3.0 litre V6 TDI 3.2 litre V6 FSI 4.
ESP A new ESP generation from Bosch in the form of ESP 8.0 is used in the Audi A6'05. The familiar basic functions already available in the other Audi models have been adapted to the conditions in the A6´05. The basic functionalities of the subfunctions EBD, ABS, TCS, EDTC, EDL, ESP and ECD are the same as in the predecessor version 5.7. The control unit and hydraulic unit cannot be separated in Customer Service. There are two different parts for front-wheel-drive and quattro drive.
Chassis Steering system A mechanically adjustable steering column is used in the basic model. Electrical adjustment is optional. As in the case of the A8´03, the A6´05 also has an electrical steering lock. A newly developed three/four-spoke steering-wheel generation is used. A conventional, hydraulic rack-and-pinion servo steering system is used. A high degree of sporty steering precision has been achieved through the consistent further development of the steering used in the predecessor model.
Wheels / tyres Engine 4 and 6-cylinder 8-cylinder Basic wheels Winter wheels Optional wheels 7J x 16 ET 35 (1) Cast alum. wheel 205/60 R16 7J x 16 ET 42 (4) Forged alum. wheel 205/60 R16 or 225/55 R16 7.5J x 16 ET 45 (7) Cast alum. wheel 225/55 R16 8J x 17 ET 48 (10) Cast alum. wheel 245/45 R17 7.5J x 16 ET 45 (2) Forged alum. wheel 225/55 R16 225 x 460 ET 46 (5) Cast alum. wh. (PAX) 225/650 – 460 7.5J x 17 ET 45 (8) Cast alum. wheel 225/50 R17 8J x 18 ET 48 (11) Cast alum. wheel 245/40 R18 7.
Electrics Bus topology Distance control J428 Control unit in dash panel insert J285 Diagnosis interface for data bus J533 Data link connector T16 NOX sensor J583 Engine electronics 1 J623 Door control unit, driver’s side J386 Power management J644 Rotation rate sensor G202 ABS with EDL J104 Door control unit, passenger’s side J387 Auxiliary heating J364 Seat occupied recognition J706 Airbag J234 Door control unit, rear left J388 Parking aid J446 Automatic transmission J217 Door control unit
Transmitter and transmitter and for telephone R36 Handset for telephone R37 Telephone/telematics J526 Display and operating unit for front information J523 Navigation with CD drive J401 TV tuner R78 CD changer R41 Digital sound package J525 Radio module R Voice input J507 MOST bus CAN Instrument cluster Switch for access and start authorisation E415 Antenna read-in unit for keyless access authorisation J723 CAN Diagnosis CAN Drive Wiper motor J400 CAN Convenience Sensor for rain and light dete
Electrics In/outputs on control units J393, J519 and J520 This overview shows all load modules in the convenience system with their in/outputs. You thus have all 3 control units and their basic functions at a glance. For further details, please refer to the function plans in self-study programme 326 A6´05, Electrics. This overview only contains discretionary wired components. Components which communicate with the control units via various bus systems are shown in the vehicle topology.
E316 Glove compartment button J520 Control unit 2 for on-board power supply N119 Solenoid valve for Servotronic V1 Motor for sliding roof: – Speed signal – Convenience opening – Convenience closing V327 Motor for glove compartment release J393 Central control unit for convenience system Master functions: – Flashing – Central locking – Interior light – Anti-theft warning system J9 Relay for rear window heater L106 Lighting for footwell, rear left L107 Lighting for footwell, rear right M2 Lamp for tail li
Air conditioning Overview The new Audi A6´05 is equipped with an air conditioning system as standard. A differentiation is made between automatic air conditioning and convenience automatic air conditioning plus. The main characteristics of the air conditioning system in the new A6´05 are the low interior noise level, no-draught ventilation and even temperature distribution. During the development process, particular attention was paid to weight and space-saving but output-optimized) components.
Audi A6´05 air conditioning unit The new Audi A6´05 – like the Audi A2 and Audi A3´04 – will be equipped with the familiar 6-piston swash-plate compressor with control valve N280 and out-flow temperature sender for evaporator G263. The compressor has the same working volume of 140 cm3 for all country variants. In the case of the 4 and 6-cylinder engines, it is driven via a plastic belt pulley and in the case of the 8-cylinder engine, via a shaft.
Air conditioning Convenience automatic air conditioning and convenience automatic air conditioning plus The new Audi A6´05 will still use an automatic air conditioning system with two-zone temperature control as standard equipment. Both the basic and convenience versions now have a circulating air filtering system (extended function) in which the filter element has been integrated within the distributor housing. Both versions have a central nozzle with adjustable temperature in the dash panel insert.
Convenience automatic air conditioning Convenience automatic air conditioning Plus A6 Predecessor Separate temperature distibution X X X Sun position sensor X X X Air quality sensor - X X Residual heat - X - Pollen filter / combination filter X/- -/X -/X Circulating air filter X X - Indirect ventilation - X - Rear compart.
Air conditioning The rear window heating is activated from Climatronic control unit J255. A message is sent to convenience system control unit J393 via CAN-Convenience. This actuates heated rear window Z1 and sends a CAN bus message to Climatronic control unit J255 that it has been switched on. The control unit then activates the respective LED in the button. The air conditioning system (both variants) in the new Audi A6´05 uses the MMI display to display relevant information.
On actuating an air conditioning function, the MMI display switches back to its original menu after a certain waiting time. The information required for this is sent from Climatronic control unit J255 to the CAN-Convenience, converted into messages for the MOST bus by Diagnosis interface for data bus J533 and fowarded as optical signals to front display and operating unit control unit J523.
Air conditioning Components in the Audi A6´05 air conditioning unit Control motors Driver’s side Front left chest vent control motor, V237 Control motor for indirect ventilation flap, V213 Control motor for central vent, V102 Left footwell flap control motor, V107 323_020 64
Passenger’s side Control motor for cold air flap V197 Front right chest vent control motor, V238 Right footwell flap control motor, V108 Control motor for defrost flap V205 Control motor for passenger compartment vent, V112 323_019 65
Air conditioning Replacing components The air conditioning unit in the new Audi A6´05 does not have to be completely removed from the vehicle to replace components. Functional units such as the evaporator or control motors, for example, are replaced in the vehicle. The evaporator, for example, will be available as a separate spare part in the scope of the Customer Service process.
Changing the pollen filter The pollen filter, which has to be changed regularly in accordance with the service specifications, is accessible from the passenger footwell. It is divided into two parts horizontally. After the bottom half has been pulled out sideways from the air conditioning units housing, the top half must first be pulled downwards and then also be pulled out sideways.
Air conditioning Control motor versions The redesigned air conditioning unit in the Audi A6´05 uses modified kinematics for the individual control motors. Always note the exact part numbers when changing control motors. Otherwise, control motors which have the same housing, but different functions might be placed in the wrong position. As a result, the basic setting of the air conditioning system would not be possible.
In/output signals at Climatronic control unit J255 CAN-Convenience output signals Information on the status of the compressor ... displays whether the compressor is switched on or off. Switched on means that the compressor is within the control range, in other words, a current of 300 – 800 mA is flowing through the compressor. Speed increase ... is transmitted from the air conditioning system to the motor if the air conditioning system needs an increased heating or cooling capacity.
Air conditioning CAN-Convenience input siganls Vehicle speed The vehicle speed is used for the calculation "Setting the air congestion flap". Engine speed Start recognition: the program defines "Engine off", if n < 200 rpm (below starter speed) "Engine on", if n > 500 rpm is read. Terminal 58d Dimming value for the display and function lighting in %. Terminal 58s Dimming value for the button lighting in %.
Analogue input and output signals The temperature sensor for fresh air intake duct G89 in the plenum chamber, the middle vent temperature sensor and the two vent temperature senders, left G150 and right G151 are read as an analogue voltage signal at Climatronic control unit J255.
Air conditioning Auxiliary / additional heating The auxiliary heating which is available ex-works is installed on the longitudinal member, front right under the headlight. It is incorporated into the CAN-Convenience via auxiliary heating control unit J364 (see topology illustration). Climatronic control unit J255 is the master control unit for the auxiliary heating.
Switch-on conditions: Switch-off conditions: no tank warning Auxiliary heating active longer than 60 min no crash signal from airbag control unit VAS diagnosis tester function basic setting no cut-off level from control unit for power management Heater units error in operational mode no message "Transport mode active" from control unit for power management J644 Tank warning during operation Crash signal during operation (in auxiliary heating mode) Cut-off level of control unit for power management
Air conditioning Air conditioning diagnosis The diagnosis options listed in the table are available via the diagnosis tester. For this purpose, the diagnosis on the CAN-Diagnosis and on the diagnosis interface for data bus J533 is performed in Climatronic control unit J255.
Special tools for the Audi A6´05 air conditioning system Puller T40072 Ratchet spanner T40083 323_027 323_026 Suction nozzle with brush T40073/1 and hose T40073/2 323_028 75
323 Vorsprung durch Technik www.audi.co.uk Service Training Audi A6´05 Self-Study Programme 323 All rights reserved. Subject to technical change. Copyright AUDI AG I/VK-35 Service.training@audi.de Fax +49-841/89-36367 AUDI AG D-85045 Ingolstadt Technical release 01/04 Printed in Germany A04.5S00.06.
