Components of Adaptive Cruise Control

Fitting location overview - adaptive cruise control

1. - Adaptive cruise control unit - J428-
   • Assembly overview
2. - ACC button - E357-
   • Combined component with steering column switch module. Cannot be renewed individually.
   • Switch module: remove and install
3. - Instrument cluster - KX2-
   • With control unit in dash panel insert - J285-
   • Removal and installation

Removing and installing the automatic distance control unit

Special tools and workshop equipment required

• Lever - U30800-

• Torque wrenches - VAG 1331-

Note For greater clarity the bumper grille is not depicted in the illustration.

Removing

• Switch off ignition and all electrical consumers.

Vehicles without access and start authorisation system

• Remove ignition key, if fitted.

Vehicles with access and start authorisation system

• Store the ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

• Removing trim for radar sensor.
• Pull out the plug -2-.
• Prise out the securing tabs -1- with the aid of the lever - U30800- in order to free the centre nipple.
• Turn the adaptive cruise control unit - J428- -3- in the -direction of the arrow-.

• Remove the adaptive cruise control unit - J428- -1- in the -direction of the arrow-.

Installing

Installation is carried out in the reverse sequence; note the following:

• Calibrate adaptive cruise control

Radar holder for the adaptive cruise control unit - J428- : remove and install

Special tools and workshop equipment required

• Calliper square - VAS 6335-

Note

• For greater clarity the bumper grille is not depicted in the illustration.
• Completely remove the adaptive cruise control unit assembly - J428- .

Removing

• Switch off ignition and all electrical consumers.

Vehicles without access and start authorisation system

• Remove ignition key, if fitted.

Vehicles with access and start authorisation system

• Store the ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

• Removing trim for radar sensor

• Pull out the plug -1-.
• Unscrew bolts -arrows-.
• Lay the adaptive cruise control unit assembly - J428- -2- on a workbench.

• Release the fasteners -1- in the -direction of the arrow-.
• Remove the fasteners -1- from the studs -2-.
• Remove the radar holder -3- from the assembly -4- adapter/ adaptive cruise control unit - J428- .

Installing

Installation is carried out in the reverse sequence; note the following:

Note

• Replace the fasteners -1-.
• The studs -1- on the adapter are pre-set. If necessary, adjust the setting.

Removing and installing trim for radar sensor

Special tools and workshop equipment required

• Lever for the front-end - 3370-

Removing

• Switch off ignition and all electrical consumers.

Vehicles without access and start authorisation system

• Remove ignition key, if fitted.

Vehicles with access and start authorisation system

• Store the ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

• Insert the lever for the front end - 3370- in the side recess and pull not too strongly in the -direction of the arrow-.

Note For greater clarity the bumper grille is not depicted in the illustration.

• Remove with the fixing lugs -2- on both sides.

Installing

Installation takes place in reverse order.

Settings of the studs on the adapter

Special tools and workshop equipment required

• Gauges for measuring spacing - VAS 6335-

In order to measure the adjustment dimension and be able to carry out adjustment the assembly adaptive cruise control unit assembly consisting of the following components - J428- must be fitted:

• Fasteners
• Radar holder
• Studs
• Adapters
• Adaptive cruise control unit - J428-

• Lay the adaptive cruise control unit assembly - J428- down on a soft and clean surface.

• With a sliding calliper measure - VAS 6335- the setting dimension -a- on all studs and adjust if necessary.
  • Setting dimension -a-= 68.2 mm

• Adjuster screws -2- of the adaptive cruise control unit - J428- -1-.

Remove and install adapter

Special tools and workshop equipment required

• Lever - U30800-

• Torque wrenches - VAG 1331-

• Calliper square - VAS 6335-

Removing

• Switch off ignition and all electrical consumers.

Vehicles without access and start authorisation system

• Remove ignition key, if fitted.

Vehicles with access and start authorisation system

• Store the ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

• Disconnect ignition and all electrical loads, and remove ignition key.
• Remove the radar holder for the adaptive cruise control unit - J428- .
• Prise out the securing tabs -1- with the aid of the lever - U30800- and move the adaptive cruise control unit - J428- -2- in -the direction of the arrow-.

• Remove the adaptive cruise control unit - J428- -2- from the adapter -1- in -the direction of the arrow-.

Installing

Installation is carried out in the reverse sequence; note the following:

Note

• Replace the fasteners .
• The studs on the adapter are pre-set. If necessary, adjust the setting.

Assembly overview - adaptive cruise control unit - J428-

Note For greater clarity the bumper grille is not depicted in the illustration.

1. - Cover
   • Removal and installation
2. - Adaptive cruise control unit - J428-
   • Removal and installation
   • Calibrating
3. - Adapter
   • Removal and installation
   • Measure adjustment and adjust if necessary
4. - Threaded pins
   • 2 units.
   • If adjustment is completed, stud setting must not be changed anymore.
   • Measure adjustment and adjust if necessary
5. - Screw
   • 2 units.
   • 8 Nm
6. - Radar holder
   • Removal and installation
7. - Mounting clips
   • 3 units.
   • Renew
8. - Electric connector
9. - Front bumper bracket
   • On the front cross member

Calibrating adaptive cruise control

Requirements

• The adaptive cruise control unit - J428- needs to be calibrated if the following conditions apply:
  • Adaptive cruise control unit - J428- has been removed and then reinstalled or it has been renewed.
  • Bumping into adaptive cruise control unit - J428- due to incautious installation of front bumper carrier.
  • Damage to the front bumper carrier as a result of a front-end collision or similar.
  • The front bumper carrier has been removed and then reinstalled or it has been renewed.
  • Rear axle toe has been adjusted.

Note

• Excessive horizontal adjustment of the adaptive cruise control unit - J428- results in permanent deactivation of the functions ACC/front scan system. This is displayed in the dash panel insert - KX2- by the following message: ACC / Front Assist not available.
• Limited sensor functionality due to soiling or weather conditions such as heavy rain, snowfall, sensor icing etc. results in a temporary non-availability of the functions ACC/front scan system. This is displayed in the dash panel insert - KX2- by the following message: ACC / Front Assist: Sensor without view.

• Calibrate adaptive cruise control.