GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the FOG LP fuse in the underhood accessory wiring junction block.

Is the FOG LP fuse open?

--

Go to Step 2

Go to Step 3

2

Repair a short to ground in CKT 316.

Is the repair complete?

--

Go to Fog Lights System Check

--

3

  1. Turn the fog lamp switch to the ON position.
  2. Turn the headlamp switch to the HEAD position on the headlamp/instrument panel (IP) dimmer switch.
  3. Turn the headlamp dimmer switch to LOW.
  4. Use a test lamp in order to backprobe between the rear window wiper/washer and multi-function switch harness connector C3 terminal E and ground.

Did the test lamp light?

--

Go to Step 7

Go to Step 4

4

Use a test lamp in order to backprobe between the rear window wiper/washer and the multi-function switch harness connector C3 terminal D and ground.

Did the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the rear window wiper/washer and multi-function switch. Refer to Multifunction Switch Assembly Replacement - Instrument Panel

Is the repair complete?

--

Go to Fog Lights System Check

--

6

Repair the following conditions in CKT 9 between S204 and the rear window wiper/washer and multi-function switch:

    • A faulty connection
    • An open circuit

Is the repair complete?

--

Go to Fog Lights System Check

--

7

Use a test lamp in order to backprobe between the underhood accessory junction block connector C2 terminal E5 and ground.

Did the test lamp light?

--

Go to Step 9

Go to Step 8

8

Repair the following conditions in CKT 317:

    • A faulty connection
    • An open circuit

Is the repair complete?

--

Go to Fog Lights System Check

--

9

Replace the fog lamp relay with a known good relay.

Did the fog lamps light?

--

Go to Step 11

Go to Step 10

10

Use a test lamp in order to backprobe the following underhood accessory junction block connectors to ground:

    • Connector C3 terminal B5
    • Connector C3 terminal A5

Did the test lamp light in both locations?

--

Go to Step 13

Go to Step 12

11

Replace the fog lamp relay.

Is the repair complete?

--

Go to Fog Lights System Check

--

12

Replace the underhood accessory junction block. Refer to Relay/Fuse Center Replacement

Is the repair complete?

--

Go to Fog Lights System Check

--

13

Replace the fog lamps. Refer to Front Fog Lamp Replacement

Is the repair complete?

--

Go to Fog Lights System Check

--