Steering Control Module: Description and Operation

CIRCUIT OPERATION
The speed proportional steering module is mounted on the rack and pinion assembly. This module adjusts the amount of power steering assist the operator receives based on vehicle speed.

At slower vehicle speeds power steering assist is increased, and at higher vehicle speeds the assist is decreased. A solenoid control valve is mounted in the power steering line and uses a variable orifice to control the assist.

Power for the steering module is provided on the F20 circuit. This circuit is protected by a 10 Amp fuse located in cavity 6 of the junction block. Feed for the fuse is supplied on the A22 circuit from the ignition switch. The fuse is HOT in the RUN position only.

The A22 circuit is protected by a 40 Amp fuse located in cavity J of the Power Distribution Center (PDC). Circuit A2 connects the PDC to the ignition switch.

Ground for the system is provided on the Z1 circuit and terminates at the left frame rail.

The steering module receives the vehicle speed input from the G7 circuit. Circuit G7 is an output from the Transmission Control Module (TCM).