GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the fog lamps are always on.

Do the fog lamps operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Use the Scan Tool to inspect for the following related Body Control Module (BCM) Data/ Input parameters and Output controls.

Refer to Scan Tool Data List in Body Control System for typical values and definitions.

    • Headlamp Ambient Light Sensor
    • Park Brake Switch
    • Auto Headlamps
    • Headlamp Relay Feedback
    • Headlamp Power Relay
    • Front Fog Lamp Switch
    • Front Fog Lamp Relay
    • Park Lamp Relay

Did you find and correct a problem?

--

Go to Step 13

Go to Step 4

4

Use the Scan Tool to monitor the Fog Lamp Switch input with the switch in the OFF positon.

Does the scan tool indicate that the switch is ON?

--

Go to Step 10

Go to Step 5

5

Remove the fog lamp relay.

Do the fog lamps turn OFF?

--

Go to Step 7

Go to Step 6

6

Locate and repair the short to battery power in CKT 34. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

7

Using a J 39200 Digital Multimeter (DMM), check for continuity to ground CKT 1317 at the Fog Lamp Relay connector in the Underhood Fuse Block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

--

Go to Step 9

Go to Step 8

8

Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement .

Is the repair complete?

--

Go to Step 13

--

9

Locate and repair the short to ground in CKT 1317. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

10

Disconnect the Fog Lamp Switch.

Test CKT 192 (ORN) for a short to ground. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

--

Go to Step 11

Go to Step 12

11

Locate and repair the short to ground in CKT 192 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

--

12

Replace the Fog Lamp Switch. Refer to Headlamp Switch Replacement

Is the repair complete?

--

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3