Adaptive Cruise Control (Acc), Adjusting, Q7 Before Product Improvement

A new adjustment is necessary if:

• The rear axle toe was adjusted.
• The Control Module for Adaptive Cruise Control -J428- and/or Control Module 2 for Adaptive Cruise Control -J850- was removed and installed.
• The front bumper was removed and installed.
• The front bumper was loosened or moved.
• The front bumper is damaged.
• If the vertical adjustment angle is greater than -1.0° to +1.0.

Special tools and workshop equipment required 

• Vehicle Diagnostic Tester
• Wheel Alignment Computer
• Screwdriver with T-bar:VAS 272 001  , not illustrated
• Setting Device - Basic Set:VAS 6430/1  or Setting Device - Basic Set:VAS 6430/1A 
  Fig 1: Identifying Setting Device VAS 6430

  Courtesy of AUDI
• ACC Reflector Mirror - Audi:VAS 6430/3 

There are two options for adjusting the adaptive cruise control sensors:

The "quick access"

This procedure should be selected for the following activities if only the adjustment will be performed.

• The Control Module for Adaptive Cruise Control -J428- and/or Control Module 2 for Adaptive Cruise Control -J850- was removed and installed.
• The front bumper was removed and installed.
• The front bumper was loosened or moved.
• The front bumper is damaged.
• If the vertical adjustment angle is greater than -1.0° to +1.0.

The "complete alignment"

This procedure should be selected for the following activities if an adjustment and an axle alignment will be performed.

• The rear axle toe was adjusted.
• the vehicle suspension was changed, for example, changing from standard to Sport suspension.

TIP:

• Both procedures are programmed in the wheel alignment computer. The respective procedure is performed automatically. It is only necessary to select the appropriate program for the procedure that will be performed.
• Before adjusting the ACC, see if the vehicle has an night vision system. If so, the camera for the night vision system must be calibrated first depending on the repair. Then both adaptive cruise control sensors can be adjusted. The previously set distance between the camera for the night vision system and the Night Vision Calibration Tool:VAS 6430/6  can be used for adjusting the ACC.

The calibration instructions that follow describe the procedure used with the Wheel Alignment Computer: VAS 701 001  .

-- "Activate vehicle lift mode" on equipment versions with air suspension. Refer to the appropriate Service Information or "Standard Vehicle Height, Initiating and Locking". Refer to STANDARD VEHICLE HEIGHT, INITIATING AND LOCKING .

If there was a previous axle alignment, the steps under "Calibration procedure without a previous axle alignment" should not performed.

Calibration procedure without previous axle alignment

-- Drive the vehicle onto the vehicle alignment platform.

• Switch off the ignition when the vehicle has come to a stop. This is the only way to ensure that the rear axle steering is in the straight-ahead position.

-- Connect the battery charger for the battery support mode. Refer to BATTERY, CHARGING .

-- Install quick-action clamps on the wheels.

-- Install the measuring sensors on the wheels.

-- Perform the wheel run-out compensation.

Adjustment procedure with previous axle alignment

• Switch off the ignition when the vehicle has come to a stop. This is the only way to ensure that the rear axle steering is in the straight-ahead position.

-- Switch off the ignition.

-- Connect the battery charger for the battery support mode. Refer to BATTERY, CHARGING .

-- Position the wheels so that they are straight.

-- Turn off all vehicle exterior lamps.

-- Close all vehicle doors.

Continuation for the alignment procedure with / without previous axle alignment

-- Select the ACC calibration button on the wheel alignment computer.

Follow the sequence for adjusting:

1. The distance between the center of the ACC Reflector Mirror - Audi:VAS 6430/3  and the Audi rings must be 120 cm ± 2.5 cm.

   TIP:

   Perform this step if night vision camera was not adjusted earlier.

   If a camera adjustment/calibration was performed earlier, then it is not necessary to reposition the Setting Device - Basic Set:VAS 6430/1A  .

2. Position the ACC Reflector Mirror - Audi:VAS 6430/3  on the right side in front of the Control Module for Adaptive Cruise Control -J428-,
3. Adjust the Control Module for Adaptive Cruise Control -J428-,
4. Attach the ACC Reflector Mirror, Audi:VAS 6430/3  on the opposite side of the calibration beam in front of Distance Regulation Control Module 2 -J850-,
5. Check the position of the bubble level and of the calibration beam (using the display on the wheel alignment computer) and correct it if necessary,
6. Adjust the Control Module 2 for Adaptive Cruise Control -J850-.

• Before adjusting the ACC, check both "sensors" and their mounts and attachments for damage, external influences and secure fit. Repair any damaged components if necessary. Likewise, check the front bumper cover for damage, cracks and secure fit and service any damaged parts, if necessary.

-- Remove the right and left air intake grille. Refer to Front Bumper .

-- Remove any dirt that may be on the sensor lens.

-- Connect the Vehicle Diagnostic Tester to the vehicle. (Guide the diagnostic cable through the door window.)

Process without a previously calibrating/adjusting the night vision camera

-- Position the Setting Device Basic Set:VAS 6430/1A  at distance -A- from the center of the ACC Reflector Mirror - Audi:VAS 6430/3  up to the Audi rings.

• Distance -A- = 120 cm ± 2.5 cm, measured between the ACC Reflector Mirror - Audi:VAS 6430/3  and the surface of the Audi rings.
• The Setting Device Basic Set:VAS 6430/1  must not be moved on the calibration beam.

-- Mount the front wheel measuring sensors -1- onto the Setting Device Basic Set Setting Device - Basic Set:VAS 6430/1A  .

Procedure for all

-- Install the ACC Reflector Mirror - Audi:VAS 6430/3  on the right side next to the vertical slits as shown.

-- In area -A-, bring item -2- on the rotary knob into alignment with the marking on the mirror (number 2 on the rotary knob must face the vehicle).

-- Align the Setting Device Basic Set:VAS 6430/1A  by moving it from side to side -B arrows-.

-- Level the bubble levels -A- and -B- on the Setting Device Basic Set Setting Device Basic Set:VAS 6430/1  using the adjusting screws -1-, -2- and -3-.

-- Adjust the mirror -4- using the crank -arrow- on the Setting Device Basic Set Setting Device - Basic Set:VAS 6430/1A  so the laser beam is vertically centered on the sensor lens. If necessary adjust the mirror -4- from side to side on the calibration beam until the laser beam is horizontally centered on the sensor lens.

-- Set the same individual toe settings of the front axle via the precision adjustment bolt -5-.

• The difference between individual toe values must be less than 6' or they must be the same.

-- Level the bubble levels -2- of the sensor -1-.

-- Using the laser beam -3- on the ACC Reflector Mirror - Audi :VAS 6430  , check if the laser beam is in the center of the sensor lens.

• If the laser beam still meets the sensor lens at this step after adjusting the same individual toe values, the Setting Device Basic Set Setting Device - Basic Set:VAS 6430/1A  is aligned correctly (positioned).
• If the laser beam does not meet the sensor lens, the Setting Device Basic Set Setting Device - Basic Set:VAS 6430/1A  must be realigned.

-- Connect the Vehicle Diagnostic Tester.

-- Switch the ignition on.

-- Select and start the Diagnostic  operating mode.

-- Select the Test plan  tab.

-- Select the Select individual test  button and select the following tree structure consecutively:

• Body
• Electrical system
• 01 - OBD-capable systems
• 13 - Distance Regulation Control Module J428
• 13/8B - Distance Regulation Control Module, functions
• 13/8B - Adjustment

-- Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

-- The fine adjustment of the Distance Regulation Control Module Control Module for Adaptive Cruise Control -J428- is controlled using the upper bolts -1- and -2- the Screwdriver with T-bar:VAS 272 001  .

Courtesy of AUDI

-- When the Distance Regulation Control Module -J428- is successfully adjusted, perform the procedure on the Distance Regulation Control Module 2 -J850-.

The procedure for adjusting the Control Module 2 for Adaptive Cruise Control -J850- is identical to adjusting Control Module for Adaptive Cruise Control -J428-. To do this, move the ACC Reflector Mirror - Audi:VAS 6430/3  -1- to the opposite side of the calibration beam. Refer to ADAPTIVE CRUISE CONTROL (ACC), ADJUSTING .

-- Select the following tree structure for the adjustment:

• Body
• Electrical system
• 01 - OBD-capable systems
• 8B - Distance Regulation Control Module 2 J850
• 8B - Distance Regulation Control Module, functions
• 8B/13 - Adjustment

-- The fine adjustment of the Distance Regulation Control Module 2 Control Module 2 for Adaptive Cruise Control -J850- takes place via the bolts -1- and -2- with the Screwdriver with T-bar:VAS 272 001  .

Courtesy of AUDI

• The ACC adjustment is confirmed when "output diagnostic test complete" appears in the Vehicle Diagnostic Tester.

-- Switch off the ignition.

-- Disconnect the vehicle diagnostic tester from the diagnostic connector.

-- Disconnect the battery charger. Refer to BATTERY, CHARGING .

-- Install the air intake grille. Refer to Front Bumper .