Daytime Running Lamps (DRL) Defeat Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Daytime Running Lamps (DRL) Defeat Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Exterior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | With a scan tool, command the DRL ON and OFF several times. Do the DRL operate as expected? |
Go to Step 4 | Go to Step 6 |
| 4 | Test the DRL On/Off signal circuit of the body control module (BCM) for a high resistance, an open, or a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 5 |
| 5 | Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 7 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? |
Go to Step 9 | - |
| 8 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |