GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was A Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Disconnect the fog lamp switch.

Did the fog lamps turn off?

Go to Step 3

Go to Step 4

3

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

Is the repair complete?

System OK

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4

Reinstall the fog lamp switch.

With the switch off, test terminal A of the switch for continuity to ground.

Is ground present?

Go to Step 5

Go to Step 6

5

Repair the short to ground in the fog lamp switch output circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

System OK

--

6

Remove the fog lamp relay.

Did the fog lamps turn off?

Go to Step 7

Go to Step 8

7

Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement .

Do the fog lamps operate?

System OK

--

8

Repair the short to battery voltage in the Fog Lamp Feed Circuit.

Is the repair complete?

System OK

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