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

Turn ON the vanity mirror lamp.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

Do any courtesy lamps operate correctly?

Go to Step 4

Go to Courtesy Lamps Inoperative

4

  1. Disconnect the appropriate lamp connector.
  2. Connect a test lamp between the courtesy lamps supply voltage circuit of the vanity mirror lamp and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

Connect a test lamp between the ground circuit of the vanity mirror lamp and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

6

Inspect for poor connections at the harness connector of the vanity mirror Lamp. 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 10

Go to Step 9

7

Repair the courtesy lamps supply voltage circuit between lamp and the body wiring harness junction block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

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8

Repair the lamp ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

9

Replace the sunshade assembly. Refer to Sunshade Replacement in Interior Trim.

Did you complete the replacement?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3