GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Remove the rear fog lamp relay .

Are the fog lamps lit?

--

Go to Step 2

Go to Step 3

2

Repair a short to B+ in circuit 122.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

3

Replace the relay 16 with a known good relay.

Are the fog lamps lit?

--

Go to Step 4

Go to Diagnostic System Check - Lighting Systems

4

Inspect for a short to ground in circuit 1317.

Is there a short in the circuit 317?

--

Go to Step 5

Go to Step 6

5

Repair a short to ground in circuit 317.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

6

Inspect for a short to ground in circuit 1977

Is there a short in circuit 1977?

--

Go to Step 7

Go to Step 8

7

Repair a short to B+ in circuit 1977.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

8

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

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--