C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Steering Warning Indicator: Testing and Inspection
Service 4W Steer Indicator Inoperative
Service 4W Steer Indicator Inoperative
Circuit Description
The instrument panel cluster (IPC) illuminates the Service Wheel Steer indicator. The rear wheel steering control module sends a Class 2 serial data
message to the IPC in order to command the indicator ON or OFF.
Diagnostic Aids
Check all connections between the IPC and the rear wheel steering control module for loose or damaged terminals or damaged wiring. Use of the
Diagnostic System Check will help ensure that there are not other conditions or DTC's that will cause a loss of communication between modules.
Test Description
The number below refers to the step number on the diagnostic table.
2. This step tests if the IPC is able to illuminate the Service Wheel Steer indicator during the bulb check.
