Circuit/System Description
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module (PSCM) continuously monitors the motor position sensor's voltage signals. The voltage signals of the motor position sensor and the digital torque sensor's index current signal are both processed by the PSCM to detect and calculate the steering wheel angle.