This function performs initiation and adjustment of the active steering.
The active steering varies the steering gear's ratio depending on the vehicle's speed. Advantages of this is a more direct steering at lower speeds and a more indirect steering at higher speeds, this in combination with yaw angle control.
If the control unit for dynamic stability control (DSC/DXC) or the steering column's connection centre (SZL) have been replaced, then these must be coded before the function can be performed.
This function must be performed after the following jobs:
Control unit for active steering (AL) has been replaced.
The steering column's connection centre (SZL) has been replaced.
The steering gear has been replaced.
Work on the steering column.
A wheel alignment has been performed or other work that may affect wheel geometry.
Test conditions:
There must be no fault codes in the following control units: Dynamic stability control (DSC/DXC) or Engine control unit (DME/DDE).
The car should stand on a level surface with the front wheels pointing straight ahead.
Ignition on, engine off - the engine is started during the procedure.
Procedure:
Start the function.
The servo motor's position angle is reset.
Start the engine.
Press "OK" to perform calibration of the steering angle sensor.
Press "OK" and turn the steering wheel from left lock to right lock and then back to middle position, repeat at least 2 times.
The warning light in the combination instrument for active steering turns off when the servo motor's position angle has been calibrated correctly.
Turn off the engine and turn off the ignition, press "OK".
Turn on the ignition, press "OK".
Press "OK" to erase the fault memory.
If the steering wheel has an off-centre position when driving straight ahead after the function has been performed, check the steering angle. With an exactly centred steering wheel position, the steering angle must be 0° (+/- 2°). If it deviates, repeat this function again.