For 1990-2009 cars

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 lamps are inoperative. Do the courtesy 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 cargo lamp switch

• | 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 6

Go to Step 4

4 | Connect a test lamp between the supply voltage and ground circuits of the inoperative lamp and activate the lamp. Does the test lamp illuminate? | Go to Step 11 | Go to Step 5
5 | Test the supply voltage and ground circuits of the inoperative lamp for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9
6 | 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 7 | Go to Step 8
7 | Test the signal and ground circuits of the affected input circuit for a short to ground, open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9
8 | 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 13 | Go to Step 10
9 | 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 13 | Go to Step 12
10 | Replace the switch in the affected circuit. Refer to one of the following replacement procedures as applicable:

• | Headlamp Switch Replacement

• | Front Side Door Lock Replacement

• | Rear Door Lock Replacement

Did you complete the replacement?

Go to Step 13

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11 | Replace the inoperative bulb. Refer to the correct replacement procedure. Did you complete the repair? | Go to Step 13 | --
12 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | --
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3