Cruise Control: Service and Repair
Adaptive Cruise Control Sensor, Adjusting
Special tools, testers and auxiliary items required
• Adjustment Tool (VAS 6190/2)
• ACC Setting Device (VAS 6430) or Setting Device Basic Set (VAS 6430/1)
• ACC Reflector Mirror (VAS 6430/3)
• Vehicle Diagnostic Tester (VAS 5051 B)
• Wheel Alignment Computer
• Before driving the vehicle onto the alignment stand, check whether there is a sufficiently large space between the vehicle and the (VAS 6430). The distance between the (VAS 6430) and the VW emblem must be 120 cm ± 2.5 cm.
• If there is not sufficient space, drive the vehicle backward onto the alignment stand in order to be able to use the corresponding space.
• If the (VAS 6430/3) is repositioned on the calibration beam during the adjustment, the (VAS 6430) setting must be checked (e.g. bubble levels, individual toe settings at the calibration beam, etc.).
• Before beginning the adjustment, check the DTC memory and correct any malfunctions present.
The adjustment procedure is described here with the (VAS 6430).
Follow the Sequence for Adjusting:
1 - Establish a distance of 120 cm ± 2.5 cm between the centrally positioned (VAS 6430/3) and the VW emblem in the radiator grille,
2 - Install the (VAS 6430/3) on the right next to the vertical slits (viewed in the direction of travel),
3 - Adjust the distance regulation control module (J428) "master",
4 - Move the ACC reflector mirror to the opposite side of the calibration beam,
5 - Check the position of the bubble levels and the calibration beam and correct if necessary,
6 - Adjust the distance regulation control module 2 (J850) "slave".
If there was a previous axle alignment, the steps under "Calibration procedure without a previous axle alignment" should not performed.
Calibration Procedure without a Previous Axle Alignment
- Select the ACC calibration with dual radar button on the wheel alignment computer.
- Follow the prerequisites for alignment. Refer to => [ Wheel Alignment Test Prerequisites ] Wheel Alignment Test Prerequisites.
Vehicles with Air Suspension
- Set the vehicle to the standard height.
- Activate vehicle lift mode. Refer to => [ Vehicle Lift Mode ] Description and Operation.
Continuation for All Vehicles
- Drive the vehicle onto the vehicle alignment platform.
- Connect the battery charger.
- Connect the (VAS 5051 B) to the vehicle. (Guide the diagnostic cable through the open window.)
• During the adjustment procedure, make sure all the vehicle doors remain closed and the vehicle exterior lighting is switched off.
- Position the front wheels so they are straight.
- Mount the quick clamps to the rear wheels.
- Mount the measurement sensor to the rear wheels.
- Perform a wheel run-out compensation and the rear wheels.
Calibration Procedure with or without a Previous Axle Alignment
- Remove the right and left fog lamp trims. Refer to - 1 -.
- Remove any dirt that may be on the sensor lens.
- Position the (VAS 6430) at a distance - a - from the centrally positioned (VAS 6430/3) in the center and parallel with respect to the VW emblem in the radiator grille.
a 47.24 in +/- 0.98 in
• The (VAS 6430) must not be moved on the calibration beam.
Procedure for All
- Install the front wheel measuring sensors - 1 - on the (VAS 6430).
- Remove the centrally positioned mirror and install it all the way on the right next to the vertical slits.
- 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).
- Use the adjustment bolts - 1 -, - 2 - and - 3 - to level the bubble levels - A - and - B - on the (VAS 6430).
- Adjust the mirror - 4 - via the crank - arrow - so that the laser beam is in the center of the sensor lens.
- Position the mirror - 4 - on the side of the calibration beam so that the laser beam is in the center of 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 measurement sensor - 1 -.
- Using the laser beam - 3 - on the (VAS 6430/3) , check whether 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 (VAS 6430) is aligned correctly (positioned).
• If the laser beam does not meet the sensor lens, (VAS 6430) alignment must be performed again.
- Press the Go to button on the (VAS 5051B) and select the "function/component selection" function.
Selection on the (VAS 5051B) for the adjustment of the distance regulation control module (J428) "master":
- Press the following buttons one after another on the screen:
• Chassis
• Adaptive cruise control
• Master
• 01 - OBD-capable system
• 13 - Distance regulation l J428
• 13 - Distance regulation, functions
• 13 - Calibrating the distance regulation control module J428
Follow the instructions on the screen to perform the adjustment.
Identification of the Adjustment Bolts of the Distance Regulation Control Module "Master"
1. Adjustment bolt
2. Adjustment bolt
3. Must not be turned - functions only as a pivot point
The procedure for adjusting the distance regulation control module 2 (J850) "slave" is identical to the procedure for adjusting the distance regulation control module "master".
To do this, move the (VAS 6430/3) - 1 - to the opposite side of the calibration beam.
Selection on the (VAS 5051B) for the adjustment of the distance regulation control module 2 "slave":
- Press the following buttons one after another on the screen:
• Chassis
• Adaptive cruise control
• Slave
• 01 - OBD-capable system
• 8B - Distance regulation 2 l J850
• 8B - Distance regulation, functions
• 8B- calibrate the distance regulation control module 2 J850.
Follow the instructions on the screen to perform the adjustment.
Identification of the Adjustment Bolts of the Distance Regulation Control Module 2
1. Adjustment bolt
2. Adjustment bolt
3. Must not be turned - functions only as a pivot point
The ACC adjustment is confirmed when "output diagnostic test complete" appears in the (VAS 5051B).