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Courtesy Lamps Always On

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.
Courtesy Lamps Always On

Step Action Yes No
Schematic Reference: Interior Lights Schematics 
Connector End View Reference: Master Electrical Component List in Wiring Systems
DEFINITION: The I/P courtesy dome and roof rail courtesy lamps are ON at all times.
1 Did you perform the Lighting System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2
  1. Ensure the instrument panel dimmer switch is not in the DOME position.
  2. Close all of the vehicle doors.
  3. Wait 20 seconds.
Are the courtesy lamps illuminated?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 Use the scan tool in order to command the courtesy lamps OFF.
Do the courtesy lamps turn OFF?		 Go to Step 4  Go to Step 6 
4
  1. Close all of the vehicle doors.
  2. With a scan tool, observe the Driver Door Open Sw. parameter and the Passenger Door Open Sw. parameter in the Lamp Status data list.
Does the scan tool indicate that both parameters are OFF?		 Go to Step 14  Go to Step 5 
5 Does the scan tool indicate that the Driver Door Open Sw. parameter is ON? Go to Step 9  Go to Step 10 
6 Disconnect the instrument panel dimmer switch.
Are the courtesy lamps illuminated?		 Go to Step 7  Go to Step 13 
7 Test for a short to ground in the courtesy lamp switch ON signal circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 18  Go to Step 8 
8
  1. Disconnect the body control module (BCM) connector C1.
  2. Test the courtesy lamp supply voltage circuit for a short to battery positive voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 18  Go to Step 14 
9
  1. Disconnect the driver door lock switch.
  2. Observe the Driver Door Open Sw. parameter as you disconnect the switch.
Does the scan tool indicate that the Driver Door Open Sw. parameter is OFF when the driver door lock switch is disconnected?		 Go to Step 16  Go to Step 11 
10
  1. Disconnect the passenger door lock switches one at a time.
  2. Observe the Passenger Door Open Sw. parameter as you disconnect each switch.
Does the scan tool indicate that the Passenger Door Open Sw. parameter is OFF when one of the passenger door lock switches is disconnected?		 Go to Step 16  Go to Step 12 
11 Test the driver door open switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 18  Go to Step 14 
12 Test the passenger door open switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 18  Go to Step 14 
13 Inspect for poor connections at the harness connector of the instrument panel dimmer 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 18  Go to Step 15 
14 Inspect for poor connections at the harness connector of the 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 18  Go to Step 17 
15 Replace the instrument panel dimmer switch. Refer to Instrument Panel (I/P) Dimmer Switch Replacement .
Did you complete the replacement?		 Go to Step 18  -
16 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 18  -
17
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 18  -
18 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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