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 , Data Communication Connector End Views , or Vehicle Access Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the courtesy/dome lamps are always on.

Do the courtesy/dome lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Inspect for the following related body control module (BCM) module data parameters. Refer to Scan Tool Data List and Scan Tool Data Definitions for typical values and definitions:

    • The courtesy lamp switch
    • The dome lamp override switch
    • The driver door ajar switch
    • The passenger door ajar switch

Was a problem found?

Go to Step 4

Go to Step 7

4

Disconnect and test the switch of the affected input circuit for proper continuity in the open and closed positions. Refer to Circuit Testing.

Does the switch operate properly?

Go to Step 5

Go to Step 6

5

Test the signal and ground circuits of the affected input circuit for the following:

    • A short to ground
    • An open
    • A high resistance

Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the harness connector of the affected switch. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Test for a short to ground in any of the courtesy lamp low control circuits.

Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

8

Inspect for poor connections at the harness connector of the BCM. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Replace the switch in the affected circuit. Refer to one of the following replacement procedures as applicable:

Did you complete the replacement?

Go to Step 11

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10

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3