GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamps switch to the OFF position.
  2. Disconnect the fog lamp switch harness connector.

Are the fog lamps lit?

--

Go to Step 3

Go to Step 2

2

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

Has the repair been made and the system rechecked?

--

Go to Fog Lights System Check

--

3

  1. Reconnect the fog lamp switch.
  2. Disconnect the underhood accessory wiring junction block harness connector C2.

Are the fog lamps lit?

--

Go to Step 5

Go to Step 4

4

Repair the short to ground in circuit 1317.

Has the repair been made and the system rechecked?

--

Go to Fog Lights System Check

--

5

  1. Reconnect the underhood accessory wiring junction block harness connector C2.
  2. Disconnect the underhood accessory wiring junction block harness connector C3.

Is either of the fog lamps lit?

--

Go to Step 8

Go to Step 6

6

  1. Reconnect the underhood accessory wiring junction block connector C3.
  2. Replace the fog lamp relay.

Are the fog lamps lit?

--

Go to Step 7

Go to Fog Lights System Check

7

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

--

8

Repair the short to B+ in circuit 34 between the underhood accessory wiring junction block and the fog lamps that remains on.

Has the repair been made?

--

Go to Fog Lights System Check

--