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 body control module (BCM) applies battery voltage to the courtesy lamps through 2 separately controlled courtesy lamp supply voltage circuits. When any door is opened, the door ajar switch contacts close and the BCM receives a door-ajar 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 circuits, providing battery voltage to all of the dome/reading lamps, ignition key cylinder lamp, and rear compartment lamp. In the event that any of these lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position, the BCM will deactivate the courtesy lamp control circuits to prevent total battery discharge.
Reference Information
Schematic Reference
* Interior Lights Schematics Interior Lights Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Interior Lighting Systems Description and Operation Interior Lighting Systems
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, doors CLOSED, observe the scan tool Ctsy. Lamp Actv. Reason parameter while turning the courtesy lamp defeat switch ON and OFF. The parameter should change between Off and Manual Defeat.
• If the parameter does not change between the commanded states, refer to Courtesy Lamp Defeat Switch Malfunction.
2. Ignition ON, courtesy lamp defeat switch OFF, observe the scan tool Ctsy. Lamp Actv. Reason parameter while opening and closing each door. The parameter should change between Door Open and Off.
• If the parameter does not change as each door is opened and closed, refer to Door Ajar Indicator Malfunction Door Ajar Indicator Malfunction.
3. Operate the dome lamp switch On and Off. The dome lamps should turn On and Off as the switch is activated.
• If the dome lamps do not turn On and Off as the switch is activated, refer to Dome Lamp Switch Malfunction.
4. Command the Courtesy Lamps 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 Lamps Malfunction.
Circuit/System Testing
Courtesy Lamp Defeat Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the E37F dome/reading lamps - front.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 ohms between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the signal circuit terminal 3 and ground.
• If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
4. Test for B+ between the signal circuit terminal 3 and ground.
• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
5. If all circuits test normal, replace the E37F dome/reading lamps - front.
Dome Lamp Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the E37F dome/reading lamps - front.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 ohms between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the signal circuit terminal 2 and ground.
• If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
4. Test for B+ between the signal circuit terminal 2 and ground.
• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
5. If all circuits test normal, replace the E37F dome/reading lamps - front.
Courtesy Lamps Malfunction
1. Ignition OFF, disconnect the harness connector at the inoperative courtesy lamp.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground:
* E37F dome/reading lamps - front terminal 1
* E37R dome/reading lamps - rear terminal 1
* E47 ignition lock cylinder lamp terminal 1
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the appropriate control circuit terminal listed below and ground:
* E37F dome/reading lamps - front terminal 4
* E37R dome/reading lamps - rear terminal 2
* E47 ignition lock cylinder lamp terminal 2
4. Command the Courtesy Lamp 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 ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
• 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 K9 body control module.
5. If all circuits test normal, replace the inoperative courtesy lamp.
Dome/Reading Lamps - Middle Malfunction - with 6C7
1. Ignition OFF, disconnect the X3 harness connector at the K9 body control module.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X3 harness connector at the K9 body control module.
4. Disconnect the harness connector at the E37M dome/reading lamps - middle.
5. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 ohms between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
7. Remove the F4DA fuse from the X51A fuse block - instrument panel and verify the test lamp turns OFF.
• If the test lamp remains illuminated, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the K9 body control module.
8. If all circuits test normal, replace the E37M dome/reading lamps - middle.
Instrument Panel Compartment Lamp Malfunction
1. Ignition OFF, disconnect the harness connector at the E27 instrument panel compartment lamp.
2. Ignition OFF, instrument panel compartment OPEN, test for less than 1 ohm between the control circuit terminal A and ground.
• If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the E27 instrument panel compartment lamp switch.
3. Ignition OFF, verify that a test lamp illuminates between the control circuit terminal A and ground.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
4. Remove the F4DA fuse from the X51A fuse block - instrument panel and verify the test lamp turns OFF.
• If the test lamp remains illuminated, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the K9 body control module.
5. If all circuits test normal, replace the E27 instrument panel compartment lamp.
Rear Compartment Courtesy Lamp Malfunction
1. Ignition OFF, disconnect the X3 harness connector at the K9 body control module.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X3 harness connector at the K9 body control module.
4. Disconnect the harness connector at the E8S rear compartment courtesy lamp.
5. Ignition OFF, trunk OPEN, test for less than 1 ohm between the control circuit terminal A and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M40 rear compartment lid latch.
6. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
7. Remove the F4DA fuse from the X51A fuse block - instrument panel and verify the test lamp turns OFF.
• If the test lamp remains illuminated, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the K9 body control module.
8. Ignition OFF, connect the harness connector at the E8S rear compartment courtesy lamp. Disconnect the harness connector at the M40 rear compartment lid latch.
9. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.
10. If all circuits test normal, replace the E8S rear compartment courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Dome Lamp Bulb Replacement Service and Repair
* Reading Lamp Replacement Service and Repair
* Ignition Lock Cylinder Bulb Replacement Ignition Lock Cylinder Bulb Replacement
* Instrument Panel Compartment Lamp Replacement Instrument Panel Compartment Lamp Replacement
* Instrument Panel Compartment Lamp Switch Replacement Service and Repair
* Dome Lamp Replacement Service and Repair
* Rear Compartment Courtesy Lamp Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming