Courtesy Lamps Always On

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy Lamps Always On Diagnostic Test

Step	Action	Yes	No
Schematic Reference: Interior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views , Body Control System Connector End Views in Body Control System, or Power Door Systems Connector End Views in Doors
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	Inspect for the following related body control module (BCM), driver door module (DDM), passenger door module (PDM), and lift gate (LGM) or end gate (EGM) module data parameters. Refer to Scan Tool Data List andScan Tool Data Definitions for typical values and definitions: The courtesy lamp switch The interior lamp defeat switch The door ajar switches The liftglass ajar switch The liftgate ajar switch The upper left dome lamp switch 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 Circuit Testing in Wiring Systems. Is continuity present?	Go to Step 5	Go to Step 6
5	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 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 Circuit Testing and Wiring 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 Circuit Testing andWiring 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 Circuit Testing and Wiring 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. Refer to one of the following replacement procedures as applicable: Headlamp Switch Replacement Latch Replacement - Front Door in Doors Latch Replacement - Rear Door in Doors Latch Replacement - Liftgate Window in Body Rear End Latch Replacement - Liftgate in Body Rear End Latch Replacement - Endgate Left Upper in Body Rear End 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: Switch Replacement - Door Lock and Side Window - Driver in Doors Switch Replacement - Door Lock and Side Window - Passenger in Doors Liftgate Control Module Replacement in Body Rear End Module Rear Body Control Replacement - Endgate in Body Rear End 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