Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: For any test that requires probing the PCM or a component harness connector, use the J 35616 Connector Test Adapter Kit. Using this kit prevents damage to the harness/component terminals. Refer to USING CONNECTOR TEST ADAPTERS in Wiring Systems.

Inspect for a set/coast switch stuck in the engaged position or the signal circuit is shorted to voltage.
For an intermittent, refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems.