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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1273 (Electronic Power Steering System - Variable Effort Steering) >> Diagnostic Information and Procedures >> DTC C0501, C0503, or C0504 >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM), or Electronic Suspension Control (ESC) module, vehicles equipped with Real Time Damping (RTD), provides a return or control circuit to the Electronic Variable Orifice (EVO) solenoid when the ignition is turned ON. This circuit is used by the control module to disable the EVO solenoid outputs when a fault is detected to provide full steering assist.

NOTE: The BCM/ESC stores the DTCs scan tool data and special functions. However, the scan tool menu to access variable effort steering is located in chassis.

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