Steering Angle Sensor: Description and Operation

Steering Wheel Rotation Sensor
The steering wheel rotation sensor scans the steering wheel rotation sensor ring in the steering column which has holes punched in it at regular intervals. The steering wheel rotation sensor uses the SCP link to tell the stability assist module whether the steering wheel is being turned left or right and how far it is being turned.
The steering wheel rotation sensor does not tell the stability assist module the position of the steering wheel relative to straight ahead. The stability assist system learns this by comparing the steering wheel position with other signals and remembering the position it has learned. The stability assist system confirms this position and modifies it as necessary during every new driving cycle of the vehicle.