GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the marker lamps are inoperative.

Do the marker lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Place the headlamp switch in the PARK position.

Do the park lamps operate normally?

Go to Step 4

Go to Symptoms - Lighting Systems

4

Inspect the inoperative bulb and socket for an open filament or poor terminal connections.

Does any lamp have an open filament or poor terminal connections?

Go to Step 6

Go to Step 5

5

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs :

    • Marker lamp supply voltage
    • Front turn signal lamp supply voltage--Domestic vehicle only
    • Ground--Export vehicle only

Did you complete the repair?

Go to Step 7

--

6

Replace the defective bulb or repair/replace the socket. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3