Audi 2008 A6 Quattro User manual

43
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SELF LEVELING SUSPENSION
SETTINGS FOR AIR SPRING SUSPENSION, AND CONNECTING VAS 5051 AND SELECTING
FUNCTIONS
Settings for air spring suspension, and connecting VAS 5051 and selecting functions
Possible level control settings --> Possible level control settings.
Adjusting vehicle level --> Vehicle level, adjusting.
Vehicle jack mode --> Vehicle jack mode.
Operating with something in tow --> Operating with something in tow.
Shipping mode --> Shipping mode.
VAS 5051 , connecting and selecting functions --> VAS 5051 , connecting and selecting functions
Possible level control settings
Driver can set four different level settings:
Automatic
Dynamic
Comfort
Lift
For further details on level settings: Operating instructions.
Vehicle level, adjusting
Vehicle level is set in the MMI.
Switch on ignition.
Press "CAR" function button. The central menu "adaptive air suspension" appears.
Select desired level via control knob.
NOTE: The automatic control procedures are dependent on speed and time. For
example, raising vehicle to the height setting is not possible above certain
speeds.
NOTE: 
Note that not every vehicle level can be selected in every driving situation.
2008 Audi A6 Quattro
SUSPENSION Suspension, Wheels, Steering
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SUSPENSION Suspension, Wheels, Steering
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For further information on vehicle levels: Operating instructions.
Vehicle jack mode
Before raising vehicle using vehicle jack or lifting platform, the vehicle jack mode must be activated so that the
automatic control procedures of the air spring suspension, do not impede the lifting using vehicle jack or lifting
platform.
Switching on
Switch on ignition.
Press "CAR" function button. The central menu "adaptive air suspension" appears.
Press "SETUP" function button. The menu "adaptive air suspension" appears.
Turn control knob to desired mode and select "ON".
Switch off ignition.
Switching off
Switch on ignition.
Press "CAR" function button. The central menu "adaptive air suspension" appears.
Press "SETUP" function button. The menu "adaptive air suspension" appears.
Turn control knob to "Vehicle jack mode" and select "OFF" to switch off vehicle jack mode.
Switch off ignition.
Operating with something in tow
If towing operation is activated, other vehicle levels can only be actuated with restrictions.
Switching on
Switch on ignition.
Press "CAR" function button. The central menu "adaptive air suspension" appears.
Press "SETUP" function button. The menu "adaptive air suspension" appears.
Turn control knob to desired mode and select "ON".
Switch off ignition.
Switching off
NOTE: Vehicle jack mode is automatically switched off at a vehicle speed above
10 km/h.
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Switch on ignition.
Press "CAR" function button. The central menu "adaptive air suspension" appears.
Press "SETUP" function button. The menu "adaptive air suspension" appears.
Turn control knob to "Towing mode" and select "OFF" to switch off towing operation.
Switch off ignition.
Shipping mode
Special tools, testers and auxiliary items required
Fig. 459: Vehicle Diagnosis, Testing And Information System VAS 5051 A
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Vehicle Diagnosis, Testing and Information System VAS 5051 A
Fig. 460: Diagnostic Cable VAS 5051/5A
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Diagnostic cable VAS 5051/5A
Shipping mode is to be activated and deactivated only using tester VAS 5051.
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If shipping mode has been activated, it is not possible to actuate a different vehicle level via MMI.
Activating and deactivating
Connect tester VAS 5051 and select functions --> VAS 5051 , connecting and selecting functions
Then
"Suspension".
"Level control system".
"On Board Diagnostic (OBD) capable systems".
"Control module for vehicle level control system".
"Activating and deactivating Level Control System Control Module -J197- shipping mode".
VAS 5051 , connecting and selecting functions
Special tools, testers and auxiliary items required
Fig. 461: Vehicle Diagnosis, Testing And Information System VAS 5051 A
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Vehicle Diagnosis, Testing and Information System VAS 5051 A
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Fig. 462: Diagnostic Cable VAS 5051/5A
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Diagnostic cable VAS 5051/5A
Fig. 463: Connecting Diagnostic Cable VAS 5051/5A Connector To Data Link Connector (DLC)
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect diagnostic cable VAS 5051/5A connector to Data Link Connector (DLC).
CAUTION: Test equipment must always be secured on the rear seat during a
road test.
Drivers must NEVER operate these tools while driving.
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Fig. 464: Identifying Volkswagen Tester VAS 5051, On Switch
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Switch on tester - arrow -.
Tester is ready for operation when it displays buttons for its operating modes.
Switch on ignition.
Touch Guided Fault Finding on screen.
Select one after another:
Brand
Model
Model year
Version
Engine identification
Confirm entered data.
Then
"Suspension".

"Level control system".
NOTE: If control modules or electric/electronic components were replaced, then
Adaptation of the component must be performed in general in "Guided
Fault Finding".
NOTE: 
Wait until tester has checked all control modules installed in the vehicle.
Press Goto button and select "Function/component selection" function.
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"On Board Diagnostic (OBD) capable systems".
"Control module for vehicle level control system".
"Functions of Level Control System Control Module -J197-".
or
"Suspension".
"Level control system"
"On Board Diagnostic (OBD) capable systems".
"Control module for vehicle level control system".
"Electrical components".
LEVEL CONTROL SYSTEM, SERVICING
Level control system, servicing
Overview of electrical/electronic components and component locations --> Electrical/electronic components
and component locations, overview.
Removing and installing Front Vehicle Level Sensor --> Front Vehicle Level Sensor , removing and
installing.
Rear Level Control System Sensor , removing and installing --> Rear Vehicle Level Sensor , removing and
installing.
Removing and installing Left Front Body Acceleration Sensor G341 and G342 --> Left Front Body
Acceleration Sensor G341 and Right Front Body Acceleration Sensor G342 , removing and installing.
Removing and installing Rear Body Acceleration Sensor G343 --> Rear Body Acceleration Sensor G343 ,
removing and installing.
Removing and installing Level Control System Control Module J197 --> Level Control System Control
Module J197 , removing and installing
Adapting Level Control System Control Module again --> Level Control System Control Module, adjusting
again.
Check body acceleration signal of front/rear body acceleration sensors --> Body acceleration signal of
front/rear body acceleration sensors, checking.
System bleeding or charging --> System bleeding or charging.
Adapt control position again
--
>
Control position, adapting again
.
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Electrical/electronic components and component locations, overview
Fig. 465: Electrical/Electronic Components And Component Locations, Overview
Courtesy of VOLKSWAGEN UNITED STATES, INC.
1 - Right Front Body Acceleration Sensor G342
Removing and installing --> Left Front Body Acceleration Sensor G341 and Right Front Body
Acceleration Sensor G342 , removing and installing
Can be checked in "Guided Fault Finding" using VAS 5051 A
2 - Right front suspension strut (air spring suspension)
With Right Front Dampening Adjustment Valve N337
Removing and installing --> Suspension strut (air spring suspension) with mounting bracket,
removing and installing
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Charging --> System bleeding or charging
3 - Level Control System Control Module J197
Removing and installing --> Level Control System Control Module J197 , removing and installing
4 - Left Front Body Acceleration Sensor G341
Removing and installing --> Left Front Body Acceleration Sensor G341 and Right Front Body
Acceleration Sensor G342 , removing and installing
Can be checked in "Guided Fault Finding" using VAS 5051 A
5 - Right rear air spring
Removing and installing --> Air springs, removing and installing
6 - Right rear shock absorber
With Right Rear Dampening Adjustment Valve N339
Removing and installing --> Shock absorber for air spring suspension, removing and installing
7 - Pressure reservoir
If pressure reservoir is removed, a system bleed of pressure reservoir must be performed beforehand
using VAS 5051 A via "Guided Fault Finding"
Removing and installing --> Pressure reservoir, removing and installing
8 - Rear Body Acceleration Sensor G343
Removing and installing --> Rear Body Acceleration Sensor G343 , removing and installing
Can be checked in "Guided Fault Finding" using VAS 5051 A
Rear Body Acceleration Sensor G343 is installed behind left wheel housing lining in vicinity of upper
shock absorber threaded connection.
9 - Left rear shock absorber
With Left Rear Dampening Adjustment Valve N338
Removing and installing --> Air springs, removing and installing
10 - Left rear air spring
Removing and installing --> Air springs, removing and installing
11
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Left Rear Level Control System Sensor G76
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Removing and installing --> Rear Vehicle Level Sensor , removing and installing
After loosening, adapt control position again --> Control position, adapting again
Can be checked in "Guided Fault Finding" using VAS 5051 A
12 - Right Rear Level Control System Sensor G77
Removing and installing --> Rear Vehicle Level Sensor , removing and installing
After loosening, adapt control position again --> Control position, adapting again
Can be checked in "Guided Fault Finding" using VAS 5051 A
13 - Left front suspension strut (air spring suspension)
With Left Front Dampening Adjustment Valve N336
Removing and installing --> Suspension strut (air spring suspension) with mounting bracket,
removing and installing
14 - Left Front Level Control System Sensor G78
Removing and installing --> Front Vehicle Level Sensor , removing and installing
After loosening, adapt control position again --> Control position, adapting again
Can be checked in "Guided Fault Finding" using VAS 5051 A
15 - Right Front Level Control Sensor G289
Removing and installing --> Front Vehicle Level Sensor , removing and installing
After loosening, adapt control position again --> Control position, adapting again
Can be checked in "Guided Fault Finding" using VAS 5051 A
16 - Air supply unit with solenoid valve block
Removing and installing air supply unit --> Air supply unit, removing and installing
Removing and installing solenoid valve block --> Solenoid valve block, removing and installing
Front Vehicle Level Sensor , removing and installing
General Information
Vehicles with level control system and/or with gas-discharge headlights have an automatic vertical aim control
system as standard equipment --> 94 - LIGHTS, SWITCHES - EXTERIOR .
To function properly, the vehicle level control system and automatic vertical aim control system require
information about compression travel or rebound travel at front and rear axles.
For this, position of left/right control arm in relation to body is transferred via a coupling rod to Left Front
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Level Control System Sensor G78 and Right Front Level Control Sensor G289. They send electrical signals to
Left High-intensity Gas Discharge Lamp Control Module/Right High-intensity Gas Discharge Lamp Control
Module J343/344.
Servicing Left High-intensity Gas Discharge Lamp Control Module/Right High-intensity Gas Discharge Lamp
Control Module J343/344 --> 94 - LIGHTS, SWITCHES - EXTERIOR .
At rear axle, these signals are relayed from Left Rear Level Control System Sensor G76 and Right Rear Level
Control System Sensor G77 to Left High-intensity Gas Discharge Lamp Control Module/Right High-intensity
Gas Discharge Lamp Control Module J343/344.
These signals are needed to determine vehicle level.
The headlight vertical aim control reacts automatically to changes in vehicle level.
The vehicle level can change in the following situations:
Operating with something in tow
Various loading conditions; vehicle empty, vehicle partially or completely loaded
Adapting control position and testing basic setting of headlights is always required when
Control arm has been removed and reinstalled or replaced,
Installation work has been performed on level control system sensor,
Level control system sensor has been replaced,
Threaded connection for coupling rod of level control system sensor was loosened at control arm.
Adapt control position again --> Control position, adapting again.
Basic setting of headlights --> 94 - LIGHTS, SWITCHES - EXTERIOR .
Removing
CAUTION: Setting of headlights and of level control system!
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Fig. 466: Identifying Harness Connector, Hex Nut, And Hex Bolt
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect harness connector - 3-.
Remove hex nut - 2-.
Remove hex bolt - 1-.
Remove vehicle level sensor.
Installing
Installation is in reverse order of removal. Note the following:
Locating hook on sensor bracket must engage on subframe.
Sensor lever must point toward front.
Tightening torques: --> Control arm, guide link, level control system sensor, assembly overview
Adapt control position again --> Control position, adapting again.
Perform basic setting of headlamps --> 94 - LIGHTS, SWITCHES - EXTERIOR .
Rear Vehicle Level Sensor , removing and installing
General Information
Vehicles level control system and/or with gas-discharge headlights have an automatic vertical aim control
system as standard equipment --> 94 - LIGHTS, SWITCHES - EXTERIOR .
To function properly, the vehicle level control system and automatic vertical aim control system require
information about compression travel or rebound travel at front and rear axles.
For this, the position of left/right trapezoidal arm in relation to the body is transferred via a coupling rod to Left
Rear Level Control System Sensor G76 and Right Rear Level Control System Sensor G77. They send electrical
signals to Left High
-
intensity Gas Discharge Lamp Control Module/Right High
-
intensity Gas Discharge Lamp
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Control Module J343/344.
Servicing Left High-intensity Gas Discharge Lamp Control Module/Right High-intensity Gas Discharge Lamp
Control Module J343/344 --> 94 - LIGHTS, SWITCHES - EXTERIOR .
At front axle, these signals are relayed from Left Front Level Control System Sensor G78 and Right Front Level
Control Sensor G289 to Left High-intensity Gas Discharge Lamp Control Module/Right High-intensity Gas
Discharge Lamp Control Module J343/344.
These signals are needed to determine vehicle level.
The headlight vertical aim control reacts automatically to changes in vehicle level.
The vehicle level can change in the following situations:
Operating with something in tow
Various loading conditions; vehicle empty, vehicle partially or completely loaded
Adapting control position and testing basic setting of headlights is always required when
Trapezoidal control arm has been removed and reinstalled or replaced,
Installation work has been performed on level control system sensor,
Level control system sensor has been replaced,
Threaded connection for coupling rod of level control system sensor was loosened at trapezoidal control
arm.
Adapt control position again --> Control position, adapting again.
Basic setting of headlights --> 94 - LIGHTS, SWITCHES - EXTERIOR .
Replacing level control system sensor with subframe installed.

Remove wheel.
CAUTION: Setting of headlights and of level control system!
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Fig. 467: Identifying Harness Connector And Bolts
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect harness connector - 3-.
Remove bolt - 1-.
Remove bolts - 2- using angled wrench. Do not bend upper retaining plate when doing this.
Remove vehicle level sensor.
Rework replacement part accordingly and install.
Fig. 468: Identifying Harness Connector And Bolts
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install bolts - 2- using angled wrench. Do not bend upper retaining plate when doing this.
Sensor lever must point outward.
NOTE: When tightening bolts - 2 -
, hold vehicle level sensor firmly in position.
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Fig. 469: Identifying Harness Connector And Bolts
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install bolt - 1-.
Connect harness connector - 3-.
Tightening torques: --> Trapezoidal control arm, upper control arm, tie rod, coil spring, level control
system sensor, assembly overview
Adapt control position again --> Control position, adapting again.
Perform basic setting of headlamps --> 94 - LIGHTS, SWITCHES - EXTERIOR .
Left Front Body Acceleration Sensor G341 and Right Front Body Acceleration Sensor G342 , removing and installing
Special tools, testers and auxiliary items required
Fig. 470: Torque Wrench V.A.G 1331
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Torque wrench V.A.G 1331
Removing
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Remove wheel.
Fig. 471: Identifying Connector, Nuts, And Body Acceleration Sensor
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect connector - 1-.
Remove nuts - arrows - and remove body acceleration sensor - 2-.
Installing
Installation is in reverse order of removal. Note the following:
Fig. 472: Identifying Connector, Nuts, And Body Acceleration Sensor
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install nuts - arrows - for body acceleration sensor and tighten to 6 Nm.
Connect harness connector - 1-.
Install wheel and tighten --> 44 - Wheels, Tires, Wheel alignment

Set vehicle on wheels
--
>
Placing vehicle onto lifting platform and onto wheels
.
NOTE: Front body acceleration sensors are installed at top in wheel housing
respectively on left and right sides.
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Checking body acceleration signal --> Body acceleration signal of front/rear body acceleration
sensors, checking.
Rear Body Acceleration Sensor G343 , removing and installing
Special tools, testers and auxiliary items required
Fig. 473: Torque Wrench V.A.G 1331
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Torque wrench V.A.G 1331
Removing
Position vehicle on lifting platform --> Placing vehicle onto lifting platform and onto wheels.
Remove decorative wheel cover, for light-
alloy wheels pull off protective cap (use pulling hook in vehicle
tool kit).
Remove wheel.

Remove left rear wheel housing liner
--
>
66 - EXTERIOR EQUIPMENT
.
NOTE: Rear Body Acceleration Sensor G343 is installed behind left wheel
housing lining in the vicinity of upper shock absorber threaded
connection.
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Fig. 474: Identifying Connector, Nuts, And Rear Body Acceleration Sensor G343
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect connector - 1-.
Remove nuts - arrows - and remove Rear Body Acceleration Sensor G343 - 2-.
Installing
Installation is in reverse order of removal. Note the following:
NOTE: 
Note installation position of rear body acceleration sensor.
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Fig. 475: Identifying Connector, Nuts, And Rear Body Acceleration Sensor G343
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install nuts - arrows - for body acceleration sensor and tighten to 6 Nm.
Connect harness connector - 1-.
Install left rear wheel housing liner --> 66 - EXTERIOR EQUIPMENT .
Install wheel and tighten --> 44 - Wheels, Tires, Wheel alignment
Set vehicle on wheels --> Placing vehicle onto lifting platform and onto wheels.
Checking body acceleration signal --> Body acceleration signal of front/rear body acceleration
sensors, checking.
Level Control System Control Module J197 , removing and installing
Removing
If control module is replaced, select function "Replace" of respective control module in "Guided Fault
Finding".
Use Vehicle Diagnosis, Testing and Information System VAS 5051 A.
NOTE: Points of - arrows - - 3 - of rear body acceleration sensor must point in
direction of travel.
NOTE: Level Control System Control Module J197 is installed behind glove
compartment on bulkhead.
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Fig. 476: Identifying Lid For Lower Glove Compartment Cover
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Remove lid - A- from lower cover of glove compartment - B-.
Fig. 477: Identifying Bolts, Control Module, And Electrical Harness Connector
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Remove bolts - 1-.
Remove control module - 2- downward.
Disengage electrical harness connectors - arrows - from control module and disconnect.
Remove control module - 2-.
Installing
Installation is in reverse order of removal. Note the following:
NOTE: The lid - A - is secured in lower cover of glove compartment - B - via 4
locking mechanisms. It is possible these locking mechanisms may be
disengaged only with difficulty, therefore make sure that the lower cover
of the glove compartment - B - is not damaged when removing.
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