GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The fog lamp and fog lamp indicator operate correctly, but the switch illumination does not turn on when the headlamps or parklamps are on.

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

  1. Disconnect the rear fog lamp switch.
  2. Turn the headlamp switch to the HEAD position.
  3. Measure the voltage at cavity A of the rear fog lamp switch connector.

Is battery voltage available at the test point?

B+

Go to Step 5

Go to Step 4

4

Repair the open CKT 8 (GRY) between the rear fog lamp switch and the ILLUM fuse.

Did you complete the repair?

--

Go to Step 6

--

5

Replace the fog lamp switch.

Did you complete the repair?

--

Go to Step 6

--

6

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3