GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

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

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the license plate lamps are inoperative.

Are the license plate lamps inoperative?

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

Go to Step 3

3

  1. Turn the light switch to the ON position.
  2. Test for battery voltage at terminal 2 of the license plate lamps connector.

Is battery voltage present?

Go to Step 5

Go to Step 4

4

Repair the open in the license plate lamp supply voltagebetween the license plate lamp and S305. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 6

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5

Repair the open in the groung circuit between the license plate lamp and S400. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3