Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module receives voltage through circuits 838 (LG/VT) and 601 (LB/PK) and ground from circuit 57 (BK). The power steering control module then communicates with the PCM through the CAN lines, circuits 1908 (WH) and 1909 (BK).