4.4 Lane Change Assistance, Calibrating

Special Tools And Workshop Equipment Required 

• Vehicle Diagnostic Tester
• Calibration Unit - VAS6350A-
• Calibration Tool - Spacing Laser - VAS6350/2-
  • When a software update should be made, this must be performed before the calibration.

Conditions 

• The Lane Change Assistance Control Module - J769-/Lane Change Assistance Control Module 2 - J770- must be calibrated. Refer to 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. -VAS6350/2- 
   • For distance measurement
   • Usage information. Refer to the -VAS6350-Owner's Manual.
2. -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. -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. -VAS6350/1- 
   • With wheel bolt adapter and measuring paddle
8. Measuring Scale 
   • For positioning the -VAS6350/4-
9. -VAS6350/3- 
   • With "laser protective eyewear"
   • On the -VAS6350A-
   • Switching on and off. Refer to -VAS6350- Owner's Manual.
10. Plastic Foot 
    • Can be adjusted when setting the horizontal position of the -VAS6350A-
    • Quantity: 3

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- on to 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
• 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.

Model	A5 Coupe/Sportback/Cabriolet
Adjustment dimension height in mm dimension -a-	800

• 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	A5 Coupe/Sportback/Cabriolet
  Left adjustment dimension read in mm on the measuring scale -1-	716

• 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 -VAS6350/3- 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 -VAS6350A-.

• 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.

Model	A5 Coupe/Sportback/Cabriolet
Adjustment dimension height in mm dimension -a-	800

• 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	A5 Coupe/Sportback/Cabriolet
  Right adjustment dimension read in mm on the measuring scale -1-	716

• 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.