Headlamps Inoperative - Low Beams (Standard)
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Headlamps Inoperative - Low Beams (Standard)
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Headlights/Daytime Running Lights (DRL) 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 | Is only one low beam headlamp inoperative? | Go to Step 4 | Go to Step 5 |
| 4 | Test the headlamp low beam supply voltage and ground circuits for 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 16 | Go to Step 9 |
| 5 |
|
Go to Step 14 | Go to Step 6 |
| 6 | Disconnect the multifunction switch. Do the low beam headlamps illuminate? |
Go to Step 7 | Go to Step 11 |
| 7 | Test the headlamp dimmer switch signal circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct a condition? |
Go to Step 16 | Go to Step 8 |
| 8 | Test the headlamp switch flash to pass signal circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct a condition? |
Go to Step 16 | Go to Step 10 |
| 9 | Inspect for poor connections at the harness connector of the inoperative bulb. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 16 | Go to Step 12 |
| 10 | Inspect for poor connections at the harness connector of the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 16 | Go to Step 15 |
| 11 | 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 16 | Go to Step 13 |
| 12 | Replace the inoperative bulb. Refer to Headlamp Bulb Replacement (GMC) or Headlamp Bulb Replacement (Chevrolet) . Did you complete the replacement? |
Go to Step 16 | - |
| 13 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 16 | - |
| 14 | Replace the low beam relay. Refer to Relay Replacement (Within an Electrical Center)
or Relay Replacement (Attached to Wire Harness)
. Did you complete the replacement? |
Go to Step 16 | - |
| 15 | Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement
. Did you complete the repair? |
Go to Step 16 | - |
| 16 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |