GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Disconnect an inoperative license plate lamp bulb.
  2. Connect a test lamp from the inoperative license plate lamp feed circuit to a good ground.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the park lamps.

Did the test lamp illuminate?

--

Go to Step 3

Go to Step 6

3

Connect a test lamp between the inoperative license plate lamp feed circuit and the license plate lamp ground circuit.

Did the test lamp illuminate?

Go to Step 4

Go to Step 7

4

Inspect for poor connections at the inoperative license plate lamp bulbs. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 8

Go to Step 5

5

Replace the inoperative license plate lamp bulbs. Refer to License Lamp Bulb Replacement .

Did you complete the replacement?

--

Go to Step 8

--

6

Repair the open or high resistance in the license plate lamp feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 8

--

7

Repair the open or high resistance in the license plate lamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you find and correct the condition?

--

System OK

Go to Step 2