GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

1

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the Courtesy lamps are always on.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Test for a short to ground in the interior lamp control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 7

Go to Step 4

4

Test for a short to ground in each of the door jamb switches circuits.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Test each door jamb switch for proper operation. Refer to the following:

    • Open switch with the door closed
    • Closed switch with the door open

Did you find a malfunctioning door jamb switch?

Go to Step 6

Go to Testing for Intermittent Conditions and Poor Connections

6

Replace the malfunctioning door jamb switch.

Did you complete the repair?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3