Courtesy Lamps Malfunction
Courtesy Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps.
Reference Information
Schematic Reference
Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool LF Door Ajar Switch and RF Door Ajar Switch parameters while opening and closing the appropriate vehicle door. The parameter should change between Ajar and Door Closed when changing between the selected states.
• If the parameter does not change between the selected states, refer to Door Ajar Indicator Malfunction (Door Ajar Indicator Malfunction).
2. Observe the scan tool Trunk Ajar Switch parameter while opening and closing the trunk. The parameter should change between Trunk Ajar and Trunk Closed when changing between the selected states.
• If the parameter does not change between the selected states, refer to Trunk Ajar Indicator Malfunction (Coupe) (Trunk Ajar Indicator Malfunction (Coupe)) Trunk Ajar Indicator Malfunction (Convertible) (Trunk Ajar Indicator Malfunction (Convertible)).
3. Observe the scan tool Dome Lamp Switch parameter while pressing and releasing the dome lamp switch. The parameter should change between OFF and ON when changing between the selected states.
• If the parameter does not change between the commanded states, refer to Dome Lamp Switch Malfunction.
4. Command the Inadvertent Power control ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states.
• If the courtesy lamps do not turn ON and OFF when commanded, refer to Courtesy Lamp Malfunction.
Circuit/System Testing
Dome Lamp Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the I/P dimmer switch.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 1.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the IPC.
3. Ignition ON, verify the scan tool dome lamp switch parameter is OFF.
• If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the IPC.
4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool dome lamp switch parameter is ON.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
5. If all circuits test normal, test or replace the I/P dimmer switch.
Courtesy Lamp Malfunction
Note: Each courtesy lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following:
* Courtesy lighting components the vehicle is equipped with.
* Component locations on the inadvertent lighting control circuit
* Each component's control and ground circuit terminals
1. Ignition OFF, disconnect the harness connector at any component with inoperative courtesy lighting.
2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohm between the ground circuit terminal and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal and the ground circuit terminal.
4. Command the Inadvertent Power control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the component with courtesy lighting.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Door Lock Replacement (Door Lock Replacement)
* Sunshade Replacement (Service and Repair)
* Cargo Lamp Replacement (Cargo Lamp Replacement)
* Instrument Panel Courtesy Lamp Bulb Replacement (Instrument Panel Courtesy Lamp Bulb Replacement)
* Instrument Panel Lamp Dimmer Switch Replacement (Service and Repair)
* Instrument Panel Compartment Lamp Switch Replacement (Service and Repair)
* Rear Compartment Lift Window Latch Replacement (Rear Compartment Lift Window Latch Replacement)
* Control Module References (Programming and Relearning) for BCM or IPC replacement, setup, and programming