GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

Turn the park lamps ON.

Do the park lamps function properly?

Go to Step 4

Go to Park Lamps Inoperative

4

Remove the lamp and Inspect the filament.

Is the lamp open?

Go to Step 8

Go to Step 5

5

Connect a test lamp between the park lamp feed circuit and to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

6

Repair the open in the park lamp feed circuit between the lamp and the fuse. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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7

Repair the open lamp ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

--

8

Replace the lamp. Refer to Parking and Turn Signal Lamp Replacement .

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3