Headlamps Inoperative - Low Beams
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. 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 in Wiring Systems. |
|||
| 1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Is only one low beam headlamp inoperative? | Go to Step 12 | Go to Step 4 |
| 4 |
|
Go to Step 5 | Go to Step 7 |
| 5 |
|
Go to Step 9 | Go to Step 6 |
| 6 | Test for a poor connection, open or short to battery voltage, in the headlamp switch headlamps ON signal circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 13 |
| 7 |
|
Go to Step 8 | Go to Step 11 |
| 8 | Test for a poor connection, open or a short to battery positive voltage in the low beam relay control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 10 |
| 9 | Inspect for a poor connection at the harness connector of the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 14 |
| 10 | Inspect for a poor connection at the low beam relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 15 |
| 11 | Inspect for a poor connection at the harness connector of the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 17 |
| 12 | Inspect the inoperative low beam headlamp voltage supply and ground circuit for a high resistance, short to ground, or an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 16 |
| 13 | Test for a short to ground or a short to battery positive voltage in the exterior lamps OFF input circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 19 | Go to Step 18 |
| 14 | Replace the multifunction turn signal switch. Refer to Multifunction, Turn Signal Switch Replacement
in Steering Wheel and Column. Did you complete the replacement? |
Go to Step 19 | - |
| 15 | Replace the low beam relay. Refer to Relay Replacement (Within an Electrical Center)
or Relay Replacement (Attached to Wire Harness)
in Wiring Systems. Did you complete the replacement? |
Go to Step 19 | - |
| 16 | Replace the inoperative low beam headlamp. Refer to Headlamp Assembly or Headlamp Bulb Replacement . Did you complete the replacement? |
Go to Step 19 | - |
| 17 | Replace the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections
in Wiring Systems. Did you complete the replacement? |
Go to Step 19 | - |
| 18 |
IMPORTANT:
Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration
in Body Control System. Replace the BCM. Refer to Body Control Module Replacement
in Body Control System.Did you complete the replacement? |
Go to Step 19 | - |
| 19 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |