RADAR SENSOR (Control Module for Adaptive Cruise Control -J428-), 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 test plan in the Vehicle Diagnostic Tester requires a readjustment.
• 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.
• The Drivetrain Control Module -J775- was calibrated or replaced.

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.
• If only the wheel sensor should be calibrated/adjusted, then the "quick access" mode must be selected on the wheel alignment computer.
• The procedure in the "quick access" mode is described in the following.

Special tools and workshop equipment required 

• Wheel Alignment Computer approved by VW/Audi
• Vehicle Diagnostic Tester
• Wheel Alignment Computer - Camera :VAS 701 001/1 
• Setting Device - Basic Set :VAS 6430/1  or Setting Device - Basic Set :VAS 6430/1A 
  Fig 1: Identifying Setting Device VAS 6430

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• ACC Reflector Mirror - Audi :VAS 6430/3 
• Screwdriver with T-bar :VAS 272 001 

Procedure 

As an example, the procedure is described for the Wheel Alignment Computer :VAS 701 001  .

• Note the test requirements. Refer to the appropriate service information .
• Follow the measurement preparations for calibrating/adjusting the driver assistance systems. Refer to the appropriate service information .

-- 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.

-- Vehicle with rear axle steering: drive the vehicle "straight" onto the alignment rack. Switch off the ignition when the vehicle has come to a stop.

-- Steer the rear axle steering into zero position. Refer to the appropriate service information .

• This is the only way to ensure that the rear axle steering is in the straight-ahead position.

-- Vehicle with air suspension: adjust to standard vehicle height and lock. Refer to Air Suspension .

-- 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.

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

-- Perform the wheel run-out compensation.

-- Remove the sensor cover. Refer to OVERVIEW - RADIATOR GRILLE .

-- 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.

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• Dimension -a- = 120 ± 2.5 cm (47.24 ± 0.98 in.)

-- Place the Camera :VAS 701 001/1  -1- for the ACC adjustment on the Setting Device - Basic Set :VAS 6430  on the right side and tighten.

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

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

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-- 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-.

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

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

-- 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:

• Diagnostic-capable systems
• 0013 - Distance Regulation Control Module 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 Screwdriver with T-bar :VAS 272 001  .

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-- Switch the ignition off.

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

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

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