GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Fog Lights Schematics

1

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

Turn the park lamps and headlamp ON then OFF.

Do the exterior lamps operate properly?

Go to Step 4

Go to Low and High Beams Headlamps Inoperative for Headlamps or Park Lamps Inoperative for Park Lamps

4

Remove the FOG LP relay.

Do the foglamps turn off?

Go to Step 7

Go to Step 5

5

  1. Reinstall the fog lamp relay.
  2. Disconnect the fog lamp switch.

Do the foglamps turn off?

Go to Step 8

Go to Step 6

6

Repair the short to voltage in the fog lamp feed circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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7

Replace the FOG LP relay.

Did you complete the replacement?

Go to Step 9

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8

Replace the fog lamp switch. Refer to Fog Lamp Switch Replacement .

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3