Courtesy Lamps Malfunction
Courtesy Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The courtesy lamps include the reading lamps, cargo lamp, and dome lamps. The cargo lamp and dome lamps may be manually turned ON or OFF by placing the interior lamp switch in the ON or OFF position. When the driver places the dome lamp defeat switch in the OFF position, these courtesy lamps will be disabled. If a door is opened, the courtesy lamps illuminate. After all the doors have been closed, the courtesy lamps will remain illuminated approximately 15 seconds after the last door closes. The courtesy lamps will also turn ON prior to any door being opened and will remain illuminated approximately 40 seconds when the driver removes the ignition key. The body control module (BCM) will immediately turn OFF the courtesy lamps if a door lock command is received with all of the doors closed, or if the ignition switch is turned to either the ON or RUN position.
Circuit/System Verification
1. Verify that the courtesy lamp switch parameter displays active and inactive while operating the courtesy lamp switch on and off.
^ If the scan tool parameter does not display the correct state in relation to the actual switch position, refer to the courtesy lamp switch circuit test.
2. Verify that the interior lamp defeat switch parameter displays on and off while operating the interior lamp defeat switch on and off.
^ If the scan tool parameter does not display the correct state in relation to the actual switch position, refer to the courtesy lamp switch circuit test.
3. Verify that the door ajar switch parameters display the correct state while opening and closing the driver and passenger doors.
^ If any of the scan tool parameters do not display the correct state in relation to the actual switch position, refer to the door jamb switch circuit test.
4. If the switch circuits test normal refer to the courtesy lamp control circuit test.
Circuit/System Testing
Courtesy Lamp Switch Circuit Test
1. Ignition OFF, disconnect the harness connector X1 at the headlamp switch.
2. Test for less than 1 ohm of resistance between the ground circuit terminal C and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool courtesy lamp switch parameter is inactive.
^ If not the specified value, test the signal circuit terminal J for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal J and the ground circuit terminal C. Verify the scan tool courtesy lamp switch parameter is active.
^ 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 BCM.
5. Ignition ON, verify the scan tool interior lamp defeat switch parameter is inactive.
^ If not the specified value, test the signal circuit terminal M for a short to ground. If the circuit tests normal, replace the BCM.
6. Install a 3A fused jumper wire between the signal circuit terminal M and the ground circuit terminal C. Verify the scan tool interior lamp defeat switch parameter is active.
^ 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 BCM.
7. If all circuits test normal, test or replace the headlamp switch.
Door Jamb Switch Circuit Test
1. Ignition OFF, disconnect the harness connector X1 at the affected door latch.
2. Test for less than 1 ohm of resistance between the listed ground circuit terminal and ground.
* Driver and LR passenger terminal D.
* Front passenger and RR passenger terminal A.
^ If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool affected door jamb switch parameter is off.
^ If not the specified value, test the listed signal circuit terminal for a short to ground. If the circuit tests normal, replace the affected control module.
* Driver and LR passenger terminal B.
* Front passenger and RR passenger terminal C.
4. Install a 3A fused jumper wire between the listed signal circuit and ground circuit terminals. Verify the scan tool affected door jamb switch parameter is on.
* Driver and LR passenger terminal B to terminal D.
* Front passenger and RR passenger terminal C to terminal A.
^ If not the specified value, test the listed signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the affected control module.
* Driver and LR passenger terminal B.
* Front passenger and RR passenger terminal C.
5. If all circuits test normal, test or replace the affected door latch.
Courtesy Lamp Control Circuit Test
1. Ignition OFF, disconnect the harness connector at the affected courtesy lamp.
2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.
4. Turn the courtesy lamp switch on and off. The test lamp should turn ON and OFF when changing between the commanded states.
^ If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
^ 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.
5. If all circuits test normal, test or replace the affected courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Dome and Reading Lamp Bulb Replacement
* Front Side Door Latch Replacement
* Rear Side Door Latch Replacement