GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp switch to the HEAD position.
  2. Turn the fog lamp switch the ON position.
  3. Turn the headlamp dimmer switch to the LOW position.
  4. Use a test lamp to backprobe between the fog lamp switch harness connector terminal F and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 2

2

Using a test light backprobe between the fog lamp switch harness connector terminal E and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 4

3

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

Has the repair been made?

--

Go to Fog Lights System Check

--

4

Repair a poor connection or an open in circuit 9 between S204 and the fog lamp switch harness connector terminal E.

Has the repair been made?

--

Go to Fog Lights System Check

--

5

Using a test light backprobe between the underhood accessory wiring junction block harness connector C2 terminal E5 and ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Repair the poor connection or the open in circuit 317.

Has the repair been made?

--

Go to Fog Lights System Check

--

7

Replace the FOG LPS relay.

Do the fog lamps turn ON?

--

Go to Fog Lights System Check

Go to Step 8

8

Replace the underhood accessory wiring junction block. Refer to Accessory Wiring Junction Block Replacement in body front end.

Has the repair been made?

--

Go to Fog Lights System Check

--