4.4 Lane Change Assistance, Calibrating

Special tools and workshop equipment required 

• Vehicle Diagnostic Tester
• Calibration Unit - VAS6350A-

Conditions 

• The Lane Change Assistance Control Module -J769-/Lane Change Assistance Control Module 2 -J770- must be calibrated using the → Vehicle diagnostic tester during the following conditions:
  • Lane Change Assistance Control Module - J769- or Lane Change Assistance Control Module 2 - J770- was replaced.
  • The rear bumper cover was damaged by a parking block, for example.
  • The rear bumper cover was removed and installed.
  • The threaded connections on the bumper mount are loosened.
  • "No or incorrect basic setting/adaptation" is stored in the DTC memory.

Preparing for Calibration 

1. Calibration Tool - Spacing Laser - VAS6350/2- 
   • For distance measurement
   • Usage information. Refer to the Calibration Tool - VAS6350- Owner's Manual.
2. Calibration Tool - 

   VAS6350A- 

3. Level 
   • On the -VAS6350A-
   • To check the horizontal position of the - VAS6350A-
4. Catch Bracket 
   • To mount the - VAS6350/2- for the distance measurement
   • Distance to the - VAS6350/1- on the rear wheels: Dimension -a- = 1700 ± 2 mm
5. Calibration Tool - Lane Change Calibration Tool - 

   VAS6350/4- 

   • Is moved from one side of the measuring field to the other during calibration
   • When installed correctly, the vehicle electrical system voltage line must be connected at lower left of the calibration device (as seen in direction of travel)
6. Brand Emblem 
   • The laser point is aligned to the center of the brand emblem
7. Calibration Tool - Wheel Center Mountings - VAS6350/1- 
   • With wheel bolt adapter and measuring paddle
8. Measuring Scale 
   • For positioning the -VAS6350/4-
9. Calibration Tool - Linear Laser - VAS6350/3- 
   • With "laser protective eyewear"
   • On the -VAS6350A-
   • Switching on and off. Refer to -VAS6350A- Owner's Manual.
10. Plastic Foot 
    • Quantity: 3
    • Can be adjusted when setting the horizontal position of the -VAS6350A-

Preliminary Work 

• Move the vehicle onto a solid, flat surface.
• Activate the "standard vehicle height" on vehicles with air suspension (MMI setting: Automatic or comfort).
• Apply the parking brake - the vehicle must not move during the measurement.
• Place the front wheels in a straight-ahead position - steering wheel in neutral position.
• Connect the Vehicle Diagnostic Tester.

TIP  :

If a malfunction message appears in the display. Refer to the Vehicle Diagnostic Tester Operating Instructions.

• Switch the ignition on.
• Remove the label with the metal foil from the bumper cover, if necessary.
• Secure three suitable wheel bolt adapters for the wheel bolts on each -VAS6350/1-.
• Insert the measuring paddle at both -VAS6350/1- and secure with the locking nut.
• Place the -VAS6350/1- onto the wheel bolts on both rear wheels.
  • The wheel center mounting rotation center must be in the wheel rotation center.
• Place the -VAS6350/1- on the wheels so that the "anti-theft wheel bolts" are not connected to the wheel center mounting.
• Adjust the measuring paddle using the locking nuts so that they move freely just above the floor.
  • The measuring paddles must move easily.
  • The measuring paddles must be vertical.
• Position the -VAS6350A- at distance -a- to the rear wheels.
  • Dimension -a- = 1,700 mm (66.92 in.)

  - Switch on the -VAS6350/2- with the ON  button.

  Display on the -VAS6350/2-:

  • "- m"
  • The laser is switched on at same time.
• For distance measurement, hold the -VAS6350/2-2- flush to the left catch bracket as shown.
  • The -VAS6350/2- must lie firmly against the catch bracket.
• Make sure the "laser beam" for the distance measurement contacts the enlarged lower part on the paddle -1-.

  If this is not the case, measuring paddle height must be corrected using locking nuts on -VAS6350/1-.

• Briefly press the ON  button for distance measurement.

Display on the -VAS6350/2-:

• "1,700 m" (specified value: 1700 ± 2 mm).
  • Repeat the measuring procedure from the right stop bracket to the right rear wheel.
  • The distance value must be the same on both sides.

If both measured values are not the same, adjust the -VAS6350A- accordingly.

Calibrating Procedure 

The Vehicle Diagnostic Tester is connected.

• 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
  • OBD-capable systems
  • CF - Lane Change Assistance Control Module 2 -J770
  • CF - Lane Change Assistance Control Module 2, Functions
  • CF - Calibration
• Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

TIP  :

• The following information clarifies which version of the lane change assistance is installed in the vehicle (SWA3.0).
• This information for adjusting the calibration device is important for later steps in the procedure to avoid malfunctions.

• Secure the -VAS6350/4- to the -VAS6350A- mount on the rear left.
  • When installed correctly, the vehicle electrical system voltage wire must be connected at the bottom left of the calibration device (as seen in direction of travel).

  Dimension -a- is measured from the upper edge of the calibration device to the floor.

  4.4 LANE CHANGE ASSISTANCE, CALIBRATING
  
  

  Model	A4/S4 Sedan	A4/S4/RS 4 Avant	A4 allroad
  Adjustment dimension height in mm dimension -a-	815	800	836

• The indicator on the base of the -VAS6350/4- must align with adjustment dimension on the measuring scale -1- on measuring field -arrow-.
  4.4 LANE CHANGE ASSISTANCE, CALIBRATING
  
  

  Model	A4/S4 Sedan	A4/S4/RS 4 Avant	A4 allroad
  Left adjustment dimension read in mm on the measuring scale -1-	709	714	714

• Connect the -VAS6350/4- to the vehicle electrical system voltage.
• Bring the -VAS6350A- into a horizontal position by turning the plastic feet.
  • Observe the bubble level (sight glass) on the -VAS6350A-arrow-.
• Turn on the -VAS6350/3A- on the -VAS6350A-.
• Wear "laser protective eyewear".
• Align the -VAS6350A- so that the -VAS6350/3A- strikes the center of the brand emblem on the rear lid.
• Check the distance on the left and right sides between the catch brackets of the -VAS6350A- and the measuring paddles -1- on wheel mountings again.
  • Specified value: 1700 ± 2 mm

Calibration Procedure 

The following should not occur during the calibration procedure:

• There must be no metal reflectors within a 2 m radius of the calibration device (for example, tool carts, metal cabinets).
• Vehicle doors must not be opened or closed.
• People must not sit in the vehicle.
• People must not go between the vehicle and the -VAS6350/4-.

Procedure 

• Turn on the -VAS6350/4- at the power switch -3-.
  • The green LED -1- must turn on.
• If the red LED -2- turns on: Check the -VAS6350/4-.
• Follow the instructions in the Vehicle Diagnostic Tester display.

  During the program sequence, there is a prompt to switch the - VAS6350/4- from the left to the right side of the -VAS6350-.

• Turn off the -VAS6350/4- and reposition the calibration tool.
  • When installed correctly, the vehicle electrical system voltage wire must be connected at the bottom left of the calibration device (as seen in direction of travel).

  Dimension -a- is measured from the upper edge of the calibration device to the floor.

  4.4 LANE CHANGE ASSISTANCE, CALIBRATING
  
  

  Model	A4/S4 Sedan	A4/S4/RS 4 Avant	A4 allroad
  Adjustment dimension height in mm dimension -a-	815	800	836

• The indicator on the base of the -VAS6350/4- must align with adjustment dimension on the measuring scale -1- on measuring field -arrow-.
  4.4 LANE CHANGE ASSISTANCE, CALIBRATING
  
  

  Model	A4/S4 Sedan	A4/S4/RS 4 Avant		A4 allroad
  Right adjustment dimension read in mm on the measuring scale-1-	709	714	714

• Turn on the -VAS6350/4- at the power switch -3-.
  • The green LED -1- must turn on.
• Follow the instructions in the Vehicle Diagnostic Tester display.
• After calibrating the lane change assistance successfully, end "calibration", switch off the ignition and disconnect the diagnostic connector.