Circuit/System Description
WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module monitors the signals received by the steering wheel angle sensor which is located on the steering column. The steering wheel angle sensor identifies the position and direction of the steering wheel rotation. The steering wheel angle signal is sending a serial data to the GMLAN high speed bus.