Adaptive Cruise Control (Acc), Adjusting

There are two choices for calibrating/adjusting:

The "complete alignment"

This procedure should be selected for the following activities if a wheel alignment and calibration/adjustment should be performed.

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

The "quick access"

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

• The Distance Regulation Control Module -J428- was removed and installed or replaced.
• The front bumper was removed and installed or replaced.
• The front bumper was loosened or adjusted.
• There is damage on the front bumper.

Special tools and workshop equipment required 

• Wheel Alignment Computer released by VW/Audi
• Vehicle Diagnostic Tester
• Camera:VAS 6331/1  , 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 
• Screwdriver with T-bar:VAS 272 001  , not illustrated

Procedure

• Observe the test requirements. Refer to AXLE ALIGNMENT TEST REQUIREMENTS .
• Measurement Preparations for Calibrating and Adjusting Driver Assist Systems. Refer to MEASUREMENT PREPARATIONS FOR CALIBRATING/ALIGNING THE DRIVER ASSIST SYSTEMS, QUICK ACCESS MODE .

-- Check sensors and retainers for damage, external influence and secure fit. Service any damaged components.

-- Check the front bumper cover for damage, cracks and secure fit. Service any damaged components.

-- Drive the vehicle "straight" onto the alignment rack. Switch off the ignition when the vehicle has come to a stop.

-- Check the DTC memory for adaptive cruise control (ACC). Fix all displayed entries.

-- Move the wheels so that they are straight.

-- Install quick-action clamps on the wheels.

-- Mount the reflectors on the quick-action clamps.

-- Perform the wheel run-out compensation.

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

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

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

• The ACC Setting Device must not be moved on the calibration beam.

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

Courtesy of AUDI

• Dimension -a- = 120 ± 2.5 cm

-- Place the Camera:VAS 6331/1  -1- for the ADR/ ACC adjustment on the Setting Device - Basic Set:VAS 6430  on the right side and tighten.

Courtesy of AUDI

-- Move the ACC Reflector Mirror:VAS 6430/3  -1- to the right on the vertical slits.

Courtesy of AUDI

-- Adjust the knob on the ACC Reflector Mirror:VAS 6430/3  -1- so that the number "2" is facing the line marking -arrows-.

Courtesy of AUDI

-- Adjust the Setting Device - Basic Set:VAS 6430  by moving the reflector mirror -2- at the side, so that the laser beam strikes the sensor lens -1-.

Courtesy of AUDI

-- Level the bubble level -A- on the ACC Reflector Mirror:VAS 6430/3  -5- using the adjusting screw -1-.

Courtesy of AUDI

-- Level the bubble level -B- using the adjusting screw -2 and 3- in the scale.

-- Adjust the height of the reflector mirror with the crank -arrow-, so that the laser beam is in the vertical center of the sensor lens.

-- If necessary, reposition the reflector mirror at the side on the calibration beam, until the laser beam is in the horizontal center of the sensor lens.

-- Turn the fine adjustment screw -4- until the display on the wheel alignment computer is within the tolerance range.

-- Using the laser beam on the reflector mirror, check again if the laser beam contacts the center of the sensor lens. If necessary align the reflector mirror again.

-- Turn on 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
• 0001 - OBD-capable systems
• 0013 - Distance Regulation Control Module J428
• 0013/8B - Distance Regulation Control Module, functions
• 0013/8B - Adjustment

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

-- The fine adjustment of the 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 Distance Regulation Control Module 2 -J850- is identical to adjusting Distance Regulation Control Module -J428-. To do this, convert the ACC Reflector Mirror:VAS 6430/3  and Camera :VAS 6331/1  to the opposite side of the calibration beam.

-- Select the following tree structure for the adjustment:

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

-- The fine adjustment of the 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

-- 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 .