Adaptive Cruise Control

Adaptive Cruise Control

The adaptive cruise control (ACC) has 2 adaptive cruise control sensors , a distance regulation control module (J428) "master" and distance regulation control module 2 (J850) "slave". The distance regulation sensor and the distance regulation control module are installed in a single housing. If sensor/control module is faulty, entire unit must be replaced.

The distance regulation control module "master" is installed on the right side of the vehicle in the bumper carrier.

The distance regulation control module 2 "slave" is installed on the left side of the vehicle in the bumper carrier.

In the following description, the sensor/control module unit is identified as the "sensor".

Malfunctions can occur due to contamination on the sensor. Clean the sensor.

The radar and ultrasound sensors must never be covered with stickers, paint or the like because this will impair the function of the ACC.

Bumps or damage to the bumper cover, wheel housing or underbody can affect the sensors. This can affect the operation of the ACC.

Before adjusting the ACC, check both sensors, their mounts, and securing elements for damage, external influences and secure fit. Repair any damaged components, if necessary. Likewise, check the front bumper cover for damage, cracks and secure fit and service any damaged parts, if necessary.

Prior to adjusting the adaptive cruise control (ACC), check the event memory and correct any malfunctions.

The ACC control module "adjustment angle measured value" shows whether the sensor is misaligned.

The ACC adjustment may only be set using a VW/Audi-approved wheel alignment device and adjustment equipment!

Proper ACC operation requires correct alignment.

• A new adjustment is necessary if:

• The rear axle toe was adjusted.

• The distance regulation control module "master" and/or distance regulation control module 2 "slave" was removed and installed.

• The front bumper carrier was removed and installed.

• The front bumper carrier was loosened or moved.

• The adjustment angle is greater than -0.8° to +0.8°.

• The vehicle was moved to the service position.