Procedure for commissioning or adjusting the active steering (AL)

The service function Commissioning/Adjusting active steering must be run during or after the following work:

• work on the steering column
  

• after replacing the active steering control unit (AL)
  

• after replacing the steering column switching centre (SZL):
  

• on calibration of the steering-angle sensor
  

• after replacing the steering gear
  

The sequence for Commissioning/Adjustment in the service function is as follows:

• Possibility to set the wheel steering angle exactly to zero for any axle alignment/wheel alignment. A precondition for this is a valid steering angle sensor value (SZL) and engine location angle (AL). Choice of calling up (see Note)
  
• Check of the validity of the steering angle sensor value. If the steering-angle sensor has only lost its revolutions, possibility of restart by steering from limit position to limit position.
  
• Reset the engine location angle (AL)
  
• Steering-angle sensor adjustment (optional; it is decided in the service function whether this is necessary or not)
  
• Delete DSC fault code memory (only for steering-angle sensor adjustment)
  
• Calibrate the engine location angle (AL)
  
• Clear AL fault code memory
  
• Possibility to preset the wheel steering angle exactly to zero for wheel alignment after successful commissioning / adjustment of the active steering. Choice of calling up (see Note)
  

Note:

Only perform axle alignment/wheel alignment if:

• The diagnosis of the active steering leads to no defect (no fault code memory entry) and there is a deviation in the position of the steering wheel
  
• The guided troubleshooting with fault code memory entry 'active steering' concludes with the defect 'Wheel alignment'
  
• Repair measures are carried out that make axle alignment/wheel alignment necessary (see corresponding repair instructions)
  

In the case of an inclined steering wheel and diagnosis of active steering without result:

• Check the steering-wheel angle (see control unit functions); in the exact centre steering wheel position it must show 0° (+/- 2°); if it does not, run commissioning / adjustment of the active steering with steering-angle sensor adjustment
  
• Check the total steering angle for active steering (see control unit functions); in the exact centre steering wheel position it must show 0° (+/- 5°); if it does not, run commissioning / adjustment of the active steering without steering-angle sensor adjustment
  
• Perform wheel alignment and adjust if necessary