Headlamps Inoperative - Low Beams
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Headlamps Inoperative - Low Beams
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Master Electrical Component List |
|||
| 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 | Using a scan tool, command the low beam headlamps ON. Do the low beam headlamps illuminate? |
Go to Step 8 | Go to Step 4 |
| 4 |
|
Go to Step 8 | Go to Step 5 |
| 5 | Connect a 15-amp fused jumper between the low beam relay control circuit and a good ground. Do the low beam headlamps illuminate? |
Go to Step 6 | Go to Step 7 |
| 6 | Test the headlamp switch signal circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 9 |
| 7 | Test the low beam relay control circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 10 |
| 8 | Inspect for poor connections at the harness connector of the turn/headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 11 |
| 9 | 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 14 | Go to Step 12 |
| 10 | Inspect for poor connections at the harness connector of the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 11 | Replace the turn/headlamp switch. Refer to Turn Signal Multifunction Switch Replacement
. Did you complete the replacement? |
Go to Step 14 | - |
| 12 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Bracket Replacement
. Did you complete the replacement? |
Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |