Normal Operation
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The steering wheel rotation sensor monitors the steering wheel position when the toothed-wheel on the steering shaft passes through its magnetic field.
Steering wheel rotation (in degrees) is sent to the ABS module through circuit 1572 (DG) and circuit 1573 (YE). Voltage is supplied by the SJB through circuit 640 (RD/YE). Ground is provided by the ABS module through circuit 1571 (BK).