Initialize Steering-Angle Sensor

→ After working on wheel suspension parts, when replacing the steering-angle sensor and after changing the wheel alignment values, calibrate the steering-angle sensor using PIWIS Tester II 9818. 

→ Keep the front wheels in straight-ahead position on the measuring platform during calibration.

→ On vehicles with electromechanical steering, also re-teach the electric steering lock settings.

Information 

• The steering-angle sensor is integrated into the steering column switch and records the movements of the steering wheel (steering wheel angle) using light switches. The data is transmitted to the PSM control unit via the CAN bus. 
• During initialisation, the steering-angle sensor learns its current position (straight-ahead position). 
• The steering-angle sensor must always be initialized if terminal 30 was interrupted (for example, battery replacement, undervoltage, steering column switch disconnected, relevant fuse removed)! 
• Calibration must be performed when working on or carrying out subsequent work on the chassis  . → Calibrating Steering-Angle Sensor  .
• The calibration results in zero point balancing (exactly straight ahead). 
• The steering angle sensor is calibrated when first fitted and when any work has been carried out on steering and chassis. Examples of this would be opening the steering wiring and alterations to toe and camber. 
• Calibration includes initialization. 

1. Turn wheels to straight-ahead position.
2. Start engine.
3. From the straight-ahead position, turn steering wheel approx. 20° to the left and 20° to the right (past straight-ahead position).
4. Drive the vehicle straight ahead for at least one second at a speed of over 4 km/h (2.5 mph).

Following successful initialization, the stored fault code is set to "Not present". The PSM indicator light in the instrument cluster goes out.

→ Prior to disconnecting the control unit, switch off ignition and remove ignition key.

→ Ensure that the power supply is not interrupted during programming.

→ Connect a battery charger with a current rating of at least → Nominal value: 40 A  to the vehicle battery.