GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the license lamps are inoperative.

Does the system operate normally?

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

Go to Step 3

3

Using a test lamp, check cavity 2 of the license plate lamps to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Test the license plate lamps cavity 1 for ground.

Is the cavity properly grounded?

Go to Step 6

Go to Step 7

5

Repair the open in the GRN wire between SP450 and license plate lamps cavity 2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

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6

Replace the license plate lamp socket. Refer to Rear License Lamp Replacement in Lighting Systems.

Is the replacement complete?

Go to Step 8

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7

Repair the ground to cavity 1 of the license plate lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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