Headlamps Always On - Low or High Beam
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 Always On - Low or High Beam
| 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 | Turn the headlamp switch to the OFF position. Do the low and high beam headlamps remain OFF? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Are the high beam headlamps ON at all times when the low beams are ON? | Go to Step 4 | Go to Step 9 |
| 4 | Disconnect the body control module (BCM) connector C1 Are the high beam headlamps illuminated? |
Go to Step 5 | Go to Step 6 |
| 5 | Test for a short to ground in the headlamp high beam relay control circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 14 |
| 6 |
|
Go to Step 7 | Go to Step 16 |
| 7 | Test for a short to ground in the flash to pass switch signal circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 8 |
| 8 | Test for a short to ground in the headlamp switch high beam signal circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 16 |
| 9 | Disconnect the BCM connector C2. Are the low beam headlamps ON? |
Go to Step 10 | Go to Step 11 |
| 10 | Test for a short to ground in the headlamp low beam relay control circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 14 |
| 11 |
|
Go to Step 12 | Go to Step 15 |
| 12 | Test for the following in the headlamp switch OFF signal circuit:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
Go to Step 20 | Go to Step 13 |
| 13 | Test for a short to ground in the headlamp switch headlamps ON signal circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 16 |
| 14 | Inspect for poor connections at 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 20 | Go to Step 17 |
| 15 | Inspect for poor connections at the turn signal/multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 18 |
| 16 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 20 | Go to Step 19 |
| 17 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Bracket Replacement
. Did you complete the replacement? |
Go to Step 20 | - |
| 18 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement
. Did you complete the replacement? |
Go to Step 20 | - |
| 19 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the repair? |
Go to Step 20 | - |
| 20 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |