Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module (PSCM) receives a class 2 power moding message from the body control module (BCM) to determine the position of the ignition switch. After a power mode OFF message is received, the PSCM monitors the ignition 1 voltage circuit to detect if a short to voltage fault exists.