GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Review the fog lamp operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the fog lamp.

Does the system operate normally?

--

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

Go to Step 3

3

Remove the rear fog lamp relay.

Do the rear fog lamps turn off?

--

Go to Step 4

Go to Step 5

4

Repair the short to voltage in CKT 122 (RED) between the rear fog lamp relay and the rear fog lamp.

Did you complete the repair?

--

Go to Step 8

--

5

Disconnect the rear fog lamp switch connector.

Does the rear fog lamp turn off?

--

Go to Step 7

Go to Step 6

6

Repair the short to ground in CKT 1977 (YEL) between the rear fog lamp relay and the rear fog lamp switch.

Did you complete the repair?

--

Go to Step 8

--

7

Replace the rear fog lamp switch.

Did you complete the repair?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3