Courtesy Lamps Always On

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Interior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views , Body Control System Connector End Views or Master Electrical Component List
1	Did you perform the Lighting Systems Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
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 in Wiring Systems	Go to Step 3
3	Ensure that the instrument panel lamp dimmer switch is in the minimum brightness position. Inspect for the following related body control module (BCM), driver door module (DDM), and passenger door module (PDM) data parameters. Refer to Scan Tool Data List and Scan Tool Data Definitions for typical values and definitions: The courtesy lamp switch The interior lamp defeat switch The door ajar switches Was a problem found?	Go to Step 4	Go to Step 8
4	Disconnect and test the switch of the affected input circuit for proper continuity in the open and closed positions. Refer to Testing for Continuity in Wiring Systems. Is continuity correct in both positions?	Go to Step 5	Go to Step 6
5	Test the signal circuits of the affected input switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 7
6	Inspect for poor connections at the harness connector of the affected switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 9
7	Inspect for poor connections at the harness connector of the module in the affected circuit. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 10
8	Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 11
9	Replace the switch in the affected circuit. Did you complete the replacement?	Go to Step 12	-
10	IMPORTANT: Perform the setup procedure for the replacement module as applicable. Replace the module in the affected circuit. Refer to the appropriate replacement procedure: Body Control Module Replacement in Body Control System Switch Replacement - Door Lock and Side Window - Driver in Doors Switch Replacement - Door Lock and Side Window - Passenger in Doors Did you complete the replacement?	Go to Step 12	-
11	IMPORTANT: Perform the setup procedure for the BCM. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?	Go to Step 12	-
12	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3