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 Viewsor 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

Is the TBC 2C Fuse in the I/P fuse block 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 OK?

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