GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting System 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

Are all of the courtesy lamps inoperative?

Go to Courtesy Lamps Inoperative

Go to Step 4

4

  1. Disconnect the appropriate lamp connector.
  2. Using a test lamp connected to ground, probe the courtesy lamps supply voltage circuit of the vanity mirror lamp.

Does the test lamp illuminate?

Go to Step 5

Go to Step 7

5

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

6

Inspect for poor connections at the harness connector of the vanity mirror lamp connector. 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 poor connections or high resistance in the courtesy lamps supply voltage circuit between the 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 a poor connection or high resistance in the lamp ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

9

Replace the sunshade or lamp as necessary. Refer to Sunshade Replacement in Interior Trim or Sunshade Illuminated Mirror Lamp Bulb Replacement .

Did you complete the repair?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3