Circuit/System Description
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module continuously monitors the steering wheel angle sensor. The steering wheel angle sensor indicates the direction in which the driver intends to go.
The power steering control module has a center detection algorithm that compares the reading of the steering angle sensor to the direction based on other vehicle sensors that the vehicle is travelling to determine if the steering angle reading is plausible.