Test Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 3. Tests for voltage at the voltage supply side of the headlamp low beam relay.
- 4. Verifies that the body control module (BCM) is providing ground to the headlamp low beam relay.
- 5. Tests if ground is constantly being applied to the headlamp low beam relay.
- 6. Tests if there is opposing voltage present or an open headlamp low beam relay control circuit.
- 12. After replacement of the BCM you must calibrate the new module for proper operation.