Courtesy Lamps Always On

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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: The courtesy lamps do not turn off with the switch in the DOOR position and all doors closed or the courtesy lamp defeat feature of the switch is inoperative.
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Turn ON the ignition, with the engine OFF. With a door open, place the instrument panel (I/P) dimmer switch in the defeat position. Place the I/P dimmer switch in the DOOR position. Close all of the vehicle doors. Wait 20 seconds. Do the lamps illuminate as expected?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Is the complaint that the courtesy lamps operate with the switch in the defeat position?	Go to Step 4	Go to Step 5
4	Test the courtesy lamps switch off signal circuit of the interior lamps switch an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 17	Go to Step 14
5	Use the scan tool in order to command the courtesy lamps OFF. Do the courtesy lamps turn OFF?	Go to Step 6	Go to Step 9
6	Close all of the vehicle doors. With a scan tool, observe the Door Open Switch and Liftgate Open Switch parameters in the data list. Does the scan tool indicate that all parameters are Closed?	Go to Step 7	Go to Step 10
7	Disconnect the I/P dimmer switch. Are the courtesy lamps illuminated?	Go to Step 8	Go to Step 12
8	Test for a short to ground in the courtesy lamp switch ON signal circuit 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 17	Go to Step 13
9	Test the courtesy lamp high control circuit for a short to battery positive voltage. 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	Disconnect the door jamb, lock or liftgate switches that indicate an open door while the door is closed. Observe the appropriate switch parameter. Does the scan tool indicate that the parameters are Closed when the switches are disconnected?	Go to Step 15	Go to Step 11
11	Test the open switch signal circuit 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 17	Go to Step 13
12	Inspect for poor connections at the harness connector of the I/P dimmer 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 17	Go to Step 14
13	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 17	Go to Step 16
14	Replace the I/P dimmer switch. Refer to Headlamp Switch Replacement . Did you complete the replacement?	Go to Step 17	-
15	Replace the inoperative switch. Refer to the following: Door Jamb Switch Replacement - Rear Lock Replacement - Front Door in Doors Latch Replacement - Liftgate in Body Rear End Did you complete the replacement?	Go to Step 17	-
16	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 17	-
17	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2