Circuit Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The rear wheel steering module provides the current that activates the rear wheel steering motor actuator control circuits. Phase A, Phase B, and Phase C are the input circuits to the steering gear motor assembly. In its active state, the output current is pulse width modulated with up to 85-amps at 12 volts, with a normal range of 20 to 50-amps. When the rear wheel steering control module does not see the rear wheel steering gear motor respond to the current inputs properly the rear wheel steering control module will set a DTC C0538.