GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Fog Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the ON position.
  2. Press the fog lamp switch to the OFF position.

Are the fog lamps OFF?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Remove the fog lamp relay.

Do the fog lamps turn OFF?

Go to Step 6

Go to Step 4

4

  1. Reinstall the fog lamp relay.
  2. Disconnect the top underhood fuse block connector.

Do the fog lamps turn OFF?

Go to Step 7

Go to Step 5

5

Repair a short to battery positive voltage on the fog lamps supply voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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6

Replace the fog lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 8

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7

Replace the top underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2