For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Verify that the interior backlighting is inoperative. Does the interior backlighting operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 | Do the park lamps operate correctly? | Go to Step 4 | Go to Symptoms - Lighting Systems
4 | Are all of the interior backlighting lamps inoperative? | Go to Step 7 | Go to Step 5
5 | Test for an open or high resistance in the following circuits of the inoperative lamp. Refer to Circuit Testing and Wiring Repairs .

• | The instrument panel lamps supply voltage

• | The park lamp supply voltage

• | The ground

Did you find and correct a condition?

Go to Step 10

Go to Step 6

6 | Connect a test lamp between the supply voltage circuit and ground circuit of the inoperative lamp. Refer to Wiring Repairs . Does the test lamp illuminate? | Go to Step 8 | Go to Step 7
7 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9
8 | Replace the affected lamp or internal lamp component. Did you complete the replacement? | Go to Step 10 | --
9 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | --
10 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3