Headlamp Switch On Indicator Inoperative
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Headlamp Switch On Indicator Inoperative Diagnostic Test
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Lighting Systems Connector End Views or Body Control System Connector End Views in Body Control System |
|||
| 1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 | Verify that the headlamp switch on indicator is inoperative. Does the headlamp switch on indicator operate properly? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Are the headlamps operating properly? | Go to Step 4 | Go to Symptoms - Lighting Systems |
| 4 |
|
Go to Step 6 | Go to Step 5 |
| 5 | Test the headlamp on indicator control circuit for an open, high resistance or short to voltage. Refer to Circuit Testing
andWiring Repairs
in Wiring Systems. Did you find and correct a condition? |
Go to Step 11 | Go to Step 8 |
| 6 | Test the headlamp indicator LED dimming circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct a condition? |
Go to Step 11 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the headlamp switch. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 11 | Go to Step 9 |
| 8 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing
andWiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 11 | Go to Step 10 |
| 9 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? |
Go to Step 11 | - |
| 10 |
IMPORTANT:
Perform the setup procedure for the BCM. Replace the BCM. Refer to Body Control Module Replacement
in Body Control System.Did you complete the replacement? |
Go to Step 11 | - |
| 11 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |