GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Turn ON the vanity mirror lamp.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

3

Are all of the reading, visor and instrument panel (I/P) compartment lamps inoperative?

Go to Step 4

Go to Step 6

4

Are any of the TBC Fuses open?

Go to Step 5

Go to Step 6

5

Test the battery positive voltage circuit of the body control module (BCM) for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 9

6

Test the inadvertent power supply voltage circuit of the vanity lamp for a short to ground, high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Test the ground circuit of the vanity lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

Inspect the inoperative bulb for an open filament.

Is the bulb good?

Go to Step 11

Go to Step 10

9

Repair the inadvertent power supply voltage circuit for a short to ground. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 12

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10

Replace the inoperative bulb.

Did you complete the replacement?

Go to Step 12

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11

Replace the sunshade. Refer to Sunshade Replacement .

Did you complete the replacement?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3