GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the park lamps operation and perform the necessary inspections?

Go to Step 2

Go to Interior Lighting Systems Description and Operation

2

Turn ON the park lamps.

Do the license lamps operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

3

Do the park lamps operate normally?

Go to Step 4

Go to Park Lamps Inoperative

4

Test the park lamp supply voltage circuit of the inoperative bulb for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Test the ground circuit of the inoperative bulb for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

Inspect for poor connections at the harness connector of the bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the bulb(s) as necessary. Refer to Rear License Lamp Replacement .

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3