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 reading lamps.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

3

Test the inadvertent power supply voltage circuit of the reading 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 8

Go to Step 4

4

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

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Inspect the inoperative bulb for an open filament.

Is the bulb good?

Go to Step 7

Go to Step 6

6

Replace the inoperative bulb. Refer to Dome Lamp Replacement .

Did you complete the replacement?

Go to Step 8

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7

Replace the dome lamp. Refer to Dome Lamp Replacement .

Did you complete the replacement?

Go to Step 6

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3