GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems in Lighting Systems.

2

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

Are the fog lamps on?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Remove the fog lamp relay.

Using a test lamp connected to a known good ground, probe the fog lamp relay switched B+ feed circuit in to the Top Underhood Accessory Wiring Junction Block.

Does the test lamp illiminate?

Go to Step 5

Go to Step 4

4

Repair a poor connection or an open in the fog lamp relay B+ switched B+ feed circuit.

Is the repair complete?

Go to Step 8

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5

Install a 3A fused jumper across the switched side of the fog lamp relay.

Do the fog lamps turn on?

Go to Step 6

Go to Step 7

6

Replace the fog lamp relay.

Is the repair complete?

Go to Step 8

--

7

Repair a poor connection or an open in the fog lamp switched circuit.

Is the repair complete?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Is the repair complete?

Go to Diagnostic System Check - Lighting Systems

Go to Step 2