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 headlamp dimmer switch to the LOW position.
  3. Turn the fog lamp switch to the ON position.
  4. Using a test light, backprobe the fog lamp switch harness connector terminal 3 and terminal 4.

Does the test light illuminate?

--

Go to Step 4

Go to Step 2

2

Check for a poor connector or an open in circuit 34 between the underhood accessory wiring junction block harness connector C2 terminal F6 and the fog lamp switch connector terminal 3.

Is there a poor connection or an open?

--

Go to Step 5

Go to Step 3

3

Replace the underhood accessory wiring junction block. Refer to Accessory Wiring Junction Block Replacement .

Has the repair been made?

--

Go to Fog Lights System Check

--

4

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

Has the repair been made?

--

Go to Fog Lights System Check

--

5

Repair a poor connection or an open in circuit 34 between the underhood accessory wiring junction block harness connector C2 terminal F6 and the fog lamp switch connector terminal 3.

Has the repair been made?

--

Go to Fog Lights System Check

--