RADAR SENSOR (Control Module for Adaptive Cruise Control -J428-), ADJUSTING

Special tools and workshop equipment required 

• Wheel Alignment Computer approved by VW/Audi
• Vehicle Diagnostic Tester
• Camera: VAS6331/1  or : VAS701001/1 
• Setting Device - Basic Set: VAS6430/1  or Setting Device - Basic Set: VAS6430/1A 
• ACC Reflector Mirror: VAS6430/3 
• Screwdriver with T-bar : VAS272001 

There are two options that can be selected for the calibration/adjustment:

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 guide"

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 moved.
• There is damage to the front bumper.

TIP:

• Both procedures are programmed in the wheel alignment computer. The procedure is automatically performed. The corresponding program for the procedure to be performed must be selected.
• If only the radar sensor calibration/adjustment should be performed, select the "quick start" mode on the wheel alignment computer.
• The procedure in the "quick start" mode is described in the information that follows.

Procedure 

The procedure is described on a : VAS6331  .

The procedure may vary if using other wheel alignment computers. In this case, follow the instructions on the wheel alignment computer screen.

• Note the test requirements. Refer to the appropriate Service Information .
• Follow the measurement preparations for calibrating/adjusting the driver assistance systems. Refer to MEASUREMENT PREPARATIONS .

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

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

-- Adjust to standard vehicle height and lock at that height. Refer to Air suspension .

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

-- Drive the vehicle "straight" onto the alignment rack.

-- Move the wheels so that they are in a straight-ahead position.

-- Install quick-action clamps on the wheels.

-- Attach the reflectors to the quick-action clamps.

-- Perform the wheel run-out compensation. Refer to WHEEL RUN-OUT COMPENSATION .

-- Remove the heating element for the adaptive cruise control (ACC) radar sensor. Refer to Heating Element for Adaptive Cruise Control Radar Sensor - Z185-, REMOVING AND INSTALLING .

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

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

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

-- Position the Setting Device Basic Set: VAS6430/1A  at distance -a- from the center of the ACC Reflector Mirror: VAS6430/3  -1- up to the Audi rings.

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• Dimension -a- = 120 ± 2.5 cm

-- Position the Camera: VAS6331/1  or : VAS701001/1  -1- on the right of the Setting Device - Basic Set: VAS6430  and tighten it.

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-- Move the ACC Reflector Mirror: VAS6430/3  -1- to the left on the vertical slits.

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-- Adjust the knob on the ACC Reflector Mirror: VAS6430/3  -1- so that the number "2" is facing the line marking -arrows-.

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-- Adjust the Setting Device - Basic Set: VAS6430  by moving the reflector mirror -2- at the side, so that the laser beam strikes the sensor lens -1-.

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-- Level the bubble level -A- on the ACC Reflector Mirror: VAS6430/3  -5- using the adjusting screw -1-.

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-- Level the bubble level -B- using the adjusting screws -2 and 3-.

-- Use the crank to adjust the reflector height -arrow- so that the laser beam is centered vertically on 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 is centered on the sensor lens. Align the reflector mirror again if necessary.

-- Switch 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:

• Diagnostic-capable systems
• 0013 - Control Module for Adaptive Cruise Control J428
• 0013 - Control Module for Adaptive Cruise Control, functions
• 0013 - Calibration

-- 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 done using the screws -1 and 2- with the : VAS272001  .

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-- Switch off the ignition.

-- Disconnect the Vehicle Diagnostic Tester from the data link connector.

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