Courtesy Lamps Inoperative

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. 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: Master Electrical Component List in Wiring Systems DEFINITION: All I/P courtesy dome and roof rail courtesy lamps are inoperative from any door or the I/P dimmer switch.
1	Did you perform the Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Turn ON the ignition, with the engine OFF. Open and close all of the vehicle doors. Observe the courtesy lamps. Do the courtesy lamps illuminate when each door is opened?	Go to Step 4	Go to Step 3
3	Are the courtesy lamps inoperative from the I/P dimmer switch also?	Go to Step 4	Go to Step 7
4	Disconnect the interior lamp I/P dimmer switch. Install a jumper between the courtesy lamp switch on signal circuit and I/P dimming return circuit. Do the courtesy lamps illuminate?	Go to Step 15	Go to Step 5
5	Test for a poor connection, open or a short to ground in the INT light fuse voltage supply circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 6
6	Test for short to ground or an open in the courtesy lamp supply voltage circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 8
7	Close all of the vehicle doors, except the inoperative door. Disconnect the inoperative door lock switch. Connect a 3-amp fused jumper wire between the door open switch signal wire and ground. Do the courtesy lamps illuminate?	Go to Step 10	Go to Step 11
8	Test for a poor connection open, or a short to battery positive voltage in the courtesy lamp on signal circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 9
9	Test for a short to battery positive voltage or a open in the I/P dimming return circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 13
10	Test the ground circuit of the inoperative door lock switch for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 12
11	Test the inoperative door lock switch open circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 13
12	Inspect for a poor connections at the harness connector of the inoperative door lock switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 14
13	Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 16
14	Replace the inoperative door lock switch. Refer to Lock Replacement - Front Door or to Lock Replacement - Rear Door in Doors. Did you complete the replacement?	Go to Step 17	-
15	Replace the I/P dimmer switch. Refer to Instrument Panel (I/P) Dimmer Switch Replacement . Did you complete the repair?	Go to Step 14	-
16	IMPORTANT: Perform the set up procedure for the body control module. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the body control module. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?	Go to Step 17	-
17	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3