Adaptive Cruise Control (Acc), Adjusting, Before Product Improvement

WARNING: This page is about a different car, the 2024 Audi SQ7, 2024 Audi Q7, 2023 Audi SQ7, and 2023 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Vehicle Diagnostic Tester
Wheel Alignment Computer
Screwdriver with T-bar:VAS272001 , not illustrated
Setting Device - Basic Set:VAS6430/1 or Setting Device - Basic Set:VAS6430/1A
ACC Reflector Mirror - Audi:VAS6430/3

A recalibration is required when:

The rear axle toe was adjusted.
The Control Module for Adaptive Cruise Control -J428- and/or Control Module 2 for Adaptive Cruise Control -J850- is removed and installed.
The front bumper is removed and installed.
The front bumper is loosened or adjusted.
There is damage to the front bumper.
The vertical misalignment angle is larger than -1.0° to +1.0°.
The Drivetrain Control Module -J775- was calibrated or replaced.

For the adjustment of the Adaptive Cruise Control Sensor there are two possibilities:

The "quick access"

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

The Control Module for Adaptive Cruise Control -J428- and/or Control Module 2 for Adaptive Cruise Control -J850- is removed and installed.
The front bumper is removed and installed.
The front bumper is loosened or adjusted.
There is damage to the front bumper.
The vertical misalignment angle is larger than -1.0° to +1.0°.

The "complete alignment"

Select the procedure for the following activities if only the adjustment and an axle alignment will be performed.

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

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.
Before starting an adaptive cruise control (ACC) check if the vehicle is equipped with a night vision system. If this is the case depending on the repair the night vision system camera must be calibrated first. Then an adjustment of both adaptive cruise control sensors can be performed. The preset distance between the night vision system camera and the Night Vision Calibration Tool :VAS6430/6 can be used for the adjustment of the adaptive cruise control (ACC).

The following adjustment describes the procedure on the Wheel Alignment Computer:VAS701001 .

Follow the preparations for calibrating/adjusting the driver assistance systems. Refer to MEASUREMENT PREPARATIONS .

-- On equipment versions with air suspension, activate the "vehicle lift mode". Refer to Service Information or "Adjusting to standard vehicle height and locking". Refer to Air Suspension .

If there was previous axle alignment the step under "adjustment procedure without a prior axle alignment" does not have to be performed.

Adjustment procedure without prior axle alignment

-- Drive the vehicle on a wheel alignment platform.

Switch off the ignition when the vehicle has come to a stop. This is the only way to ensure that the rear axle steering is in the straight-ahead position.

-- Connect the battery charger for the battery support mode. Refer to BATTERY, CHARGING .

-- Install quick-action clamps on the wheels.

-- Install the measuring sensors on the wheels.

-- Perform the wheel run-out compensation.

Adjustment procedure with a prior axle alignment

Switch off the ignition when the vehicle has come to a stop. This is the only way to ensure that the rear axle steering is in the straight-ahead position.

-- Switch the ignition off.

-- Connect the battery charger for the battery support mode. Refer to BATTERY, CHARGING .

-- Move the wheels so that they are straight.

-- Switch off the vehicle exterior lamps.

-- Close all vehicle doors.

Continuation of adjustment procedure with / without prior axle alignment

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

Observe the following adjustment sequence:

The distance between the center of the ACC Reflector Mirror - Audi:VAS6430/3 and the Audi rings must be 120 cm ± 2.5 cm (47.24 ± 0.98 in.).
TIP:

Perform this step if night vision camera was not adjusted earlier.

If a camera adjustment/calibration was performed earlier, then it is not necessary to reposition the Setting Device - Basic Set:VAS6430/1A .
Position the ACC Reflector Mirror - Audi:VAS6430/3 on the right side in front of the Control Module for Adaptive Cruise Control -J428-,
Adjust the Control Module for Adaptive Cruise Control -J428-
Install the ACC Reflector Mirror:VAS6430/3 on the opposite side of the calibration beam in front of the Control Module 2 for Adaptive Cruise Control -J850-,
Check the bubble level of the calibration beam (according to the display in the wheel alignment computer) and correct if necessary,
Adjust the Control Module 2 for Adaptive Cruise Control -J850-.

Before starting an Adaptive cruise control (ACC) adjustment, check both "sensors: their retainers and frames for damage, external influence and secure fit. Repair any damaged components if necessary. Check the front bumper cover for damage, cracks, and secure fit, if necessary service the damaged components.

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

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

-- Connect the Vehicle Diagnostic Tester on the vehicle. (Guide the diagnostic cable through the open door window).

Procedure without prior calibration/adjustment of the night vision system camera

Fig 1: Identifying Setting Device Basic Set VAS 6430/1

Courtesy of AUDI

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

Distance -A- = 120 cm ± 2.5 cm (47.24 ± 0.98 in.), measured between ACC Reflector Mirror: VAS6430/3 and the surface of the Audi rings.
The Setting Device Basic Set:VAS6430 must not be moved on the calibration beam.

-- Position the sensor from the front wheels -1- on the Setting Device Basic Set:VAS6430 .

Fig 2: Front Wheel Measuring Sensors

Courtesy of AUDI

Procedure for all

Fig 3: Identifying Front Wheel Measuring Sensors

Courtesy of AUDI

-- Install the ACC Reflector Mirror:VAS6430/3 on the right near the vertical slits as shown.

-- In the 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).

Fig 4: Identifying Special Tool VAS 6430/3 Setup

Courtesy of AUDI

-- Align the Setting Device Basic Set:VAS6430/1A by moving it from side to side in the direction of -B arrows-.

Fig 5: Identifying Setting Device Basic Set VAS 6430/1

Courtesy of AUDI

-- Level the bubble levels -A and B- on the Setting Device Basic Set:VAS6430/1 using the adjusting screws -1-, -2- and -3-.

Fig 6: Adjusting Special Tool VAS 6430/3 Mirror

Courtesy of AUDI

-- Adjust the mirror -4- using the crank -arrow- on the Setting Device Basic Set:VAS6430/1A so the laser beam is vertically centered on the sensor lens. If necessary, reposition the mirror -4- on the side of the calibration beam, until the laser beam horizontally hits the sensor lens in the center.

Fig 7: Adjusting Special Tool VAS 6430/3 Mirror

Courtesy of AUDI

-- Adjust the same individual toe values of the front axle with the fine adjustment screw -5-.

The difference between both individual toe values must be smaller than or equal 6'.

-- Level out the bubble levels -2- of the sensors -1-.

Fig 8: Identifying Special Tool VAS 6430/3 Setup

Courtesy of AUDI

-- Then, using the laser beam -3- at the Setting Device Basic Set:VAS6430 , check again if the laser beam hits the sensor lens.

If the laser beam still hits the sensor lens at this step, after adjusting the same individual toe values, then the Setting Device Basic Set:VAS6430 is adjusted correctly (positioned).
If the laser beam does not hit the sensor lens, then the alignment of the Setting Device Basic Set:VAS6430 must be repeated.

-- Connect 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
01 - OBD-capable systems
13 - Distance Control I J428
13/8B - Control Module for Adaptive Cruise Control, Functions
13/8B - 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 done using the screws -1- and -2- with the Screwdriver with T-bar:VAS272001 .

Courtesy of AUDI

-- When the Control Module for Adaptive Cruise Control -J428- has been adjusted successfully, then the procedure at the Control Module 2 for Adaptive Cruise Control -J850- is performed.

Fig 9: Identifying VAS 6430/3

Courtesy of AUDI

The procedure of adjusting the Control Module 2 for Adaptive Cruise Control -J850- is the same as for the Control Module for Adaptive Cruise Control -J428-. For this, rebuild the ACC Reflector Mirror - Audi:VAS6430/3 -1- to the opposite side of the calibration beam. Refer to ADAPTIVE CRUISE CONTROL (ACC), ADJUSTING .

-- Select the following tree structure for the adjustment:

Body
Electrical system
01 - OBD-capable systems
8B Distance Regulation Control Module 2 - J850
8B - Control Module for Adaptive Cruise Control, Functions
8B/13 - Adjustment

-- The fine adjustment of the Control Module 2 for Adaptive Cruise Control -J850- is done using the screws -1 and 2- with the Screwdriver with T-bar:VAS272001 .

Courtesy of AUDI

The ACC adjustment is only applied if "output diagnostic test mode complete" is displayed on the Vehicle Diagnostic Tester.

-- Switch the ignition off.

-- 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 .