Interior Backlighting Inoperative

WARNING: This page is about a different car, the 2005 GMC Canyon and 2005 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Verify that the interior backlighting is inoperative. Does the interior backlighting operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Computer/Integrating Systems 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