Steering Wheel Angle Sensor

On vehicles equipped with adaptive steering, the steering wheel rotation sensor is part of the SASM and clockspring assembly. The steering wheel rotation speed, angle and direction of travel is derived based on the position of the steering wheel position sensor and is sent to the ABS module over the HS-CAN2.

On vehicles not equipped with adaptive steering, information from the wheel speed sensors, PSCM and RCM are used by the ABS module to determine steering wheel angle offset when the vehicle is driven after initial start up. The ABS module uses the information received to calculate the steering offset from center; the module saves the information in memory and transmits the information to the PSCM over the HS-CAN2. Then, using the information provided from the ABS module, the PSCM determines the steering angle and transmits the steering angle over the CAN. The ABS module must re-learn the steering center whenever power is lost, for example during service when the battery is disconnected. To re-learn the steering center, the vehicle must be driven over 20 km/h (12 mph) for at least 1 minute on a fairly straight road.