GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior 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

  1. Ensure the panel dimmer is in the maximum position.
  2. Disconnect the switch with the inoperative lamp.
  3. Connect a test lamp between the fused interior park lamps feed circuit or the instrument panel lamp feed circuit and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

Connect a test lamp between the switch ground circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

6

Repair the open in the fused interior park lamps feed circuit or the instrument panel 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 in the switch ground circuit between lamp and ground. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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8

Replace the switch or lamp as needed.

Did you complete the repair?

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