Cruise Control: Service and Repair
Adaptive Cruise Control Sensor, Adjusting
Special tools, testers and auxiliary items required
• Adjuster for ACC (VAS 6190/2)
• Vehicle Diagnosis Tester (VAS 5052) with its diagnostic cable
• ACC Setting Device (VAS 6430) or Setting Device Basic Set (VAS 6430/1)
• ACC Reflector Mirror Audi VAS 6430/3 (VAS 6430/3)
• Wheel Alignment Computer
There are two possibilities 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 distance regulation control module (J428) and/or distance regulation control module 2 (J850) was removed and installed.
• The front bumper was removed and installed.
• The front bumper was loosened or moved.
• The front bumper is damaged.
• The adjustment angle is greater than -0.8° to +0.8°.
• The adaptive cruise control sensors are over adjusted vertically.
The "Complete Alignment"
This procedure should be selected for the following activities if an adjustment and a suspension adjustment will be performed.
• The rear axle toe was adjusted.
• The vehicle suspension was changed, for example, changing from standard to sport suspension.
• Both procedures are programmed into the axle 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 a night vision system. If so, the camera for the night vision system must be calibrated first depending on the repair. After that both adaptive cruise control sensors can be adjusted. The previously set distance between the camera for the night vision system and the night vision assist calibration & adjust tool (VAS 6430/6) can be used for adjusting the ACC.
If there was a previous axle alignment, the steps under "Calibration procedure without a previous axle alignment" should not performed.
Preparation work for calibrating and adjusting driver assist systems, refer to => [ Preparation Work for Calibrating and Adjusting Driver Assist Systems ] Preparation Work for Calibrating and Adjusting Driver Assist Systems.
Calibration procedure without a previous axle alignment
- Install quick clamps on the rear wheels.
- Install measuring sensors on the rear wheels.
- Perform a rim run-out compensation on the rear wheels.
Calibration procedure with a previous axle alignment
- Connect the battery charger.
- Position the front wheels so they are straight.
- Connect the vehicle diagnostic tester to the vehicle and guide the diagnostic cable through the open window.
- Turn off all vehicle exterior lamps.
- Close all vehicle door.
Calibration procedure with or without a previous axle alignment
- Select the ACC calibration button on the alignment computer.
Follow the sequence for adjusting:
1 - The distance between the center of the (VAS 6430/3) and the Audi rings must be 120 cm +/- 2.5 cm.
• Perform this step if night vision camera was not adjusted earlier.
• If an adjustment was performed earlier, then the (VAS 6430) must be repositioned.
2 - Position the (VAS 6430/3) on the right side in front of the distance regulation control module,
3 - Adjust the distance regulation control module,
4 - Attach the (VAS 6430/3) on the opposite side of the calibration beam in front of distance regulation control module 2,
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 distance regulation control module 2.
• Before adjusting the ACC, check both "sensors" and their mounts and attachments for damage, external influences and secure fit. Repair any damaged components. 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 grilles - 1 -.
- 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 (VAS 6430) in distance - A - from the center of the (VAS 6430/3) up to the Audi rings.
• Distance - A - = 120 cm +/- 2.5 cm, measured between the (VAS 6430/3) and the surface of the Audi rings.
• The (VAS 6430) must not be moved on the calibration beam.
- Install the front wheel measuring sensors - 1 - on the (VAS 6430).
Procedure for All
- Install the (VAS 6430/3) on the right side next to the vertical slits as illustrated.
- In area - A -, bring item - 2 - on rotary knob into alignment with marking on mirror (number 2 on rotary knob must face toward vehicle).
- Align the (VAS 6430) by moving it from side to side - arrows B -.
- Level the bubble levels - A and B - on the (VAS 6430) using the adjusting screws - 1, 2 and 3 -.
- Using the crank handle - arrow - on the (VAS 6430) , set mirror - 4 - so that laser beam coincides with the center of the sensor lens in the vertical plane. If necessary, re-position mirror - 4 - laterally on the cross bar so that laser beam coincides with the center of the sensor lens in the horizontal plane.
- Adjust the same front axle individual toe settings using fine adjustment screw - 5 -.
• The difference between individual toe values must be less than 6' or they must be the same.
- Bring bubbles - 2 - on measurement sensor - 1 - into balance.
- Now using the laser beam - 3 - on the (VAS 6430) , check if the laser beam contacts 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.
- Turn on the vehicle diagnostic tester.
The vehicle diagnostic tester is ready for operation when the operating modes are displayed.
- Turn ignition on.
- Touch Guided Fault Finding.
- Select one after another:
• Brand
• Model
• Model year
• Version
• Engine code
- Confirm data entered.
Wait until the vehicle diagnostic tester has checked all the vehicle control module.
- Press the go to button and select "function/component selection".
- Select the corresponding program in "Guided Functions".
Now follow instructions on screen to perform adjustment.
- Use the lower screw - 1 - and the upper screw - 2 - to the fine adjust the distance regulation control module in "Guided Functions".
After the distance regulation control module has been adjusted successfully, then adjust the distance regulation control module 2.
The procedure for adjusting the distance regulation control module 2 is identical to adjusting distance regulation control module. To do this, move the (VAS 6430/3) - 1 - to the opposite of the of the calibration beam. Refer to => [ Adaptive Cruise Control Sensor, Adjusting ] Service and Repair.
- Use the lower screw - 1 - and the upper screw - 2 - to fine adjust the distance regulation control module 2 in "Guided Functions".
The ACC adjustment is confirmed when "output diagnostic test complete" appears in the vehicle diagnostic tester.
- Turn ignition off.
- Disconnect diagnostic cable connector from Data Link Connector (DLC).
- Disconnect battery charger.
- Install the air intake grille.