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 courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
Reference Information
Schematic Reference
Interior Lights Schematics Interior Lights Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
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 Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON, observe the appropriate scan tool Door Open Sw. parameter while opening and closing the driver and passenger doors. The parameter should change between Open and Closed.
• If the parameter does not change between the selected states, refer to Door Ajar Indicator Malfunction (With RPO AXC/AXE) Door Ajar Indicator Malfunction (With RPO AXC/AXE)Door Ajar Indicator Malfunction (Without RPO AXC/AXE) Door Ajar Indicator Malfunction (Without RPO AXC/AXE).
2. Ignition ON, observe the appropriate scan tool Rear Door Ajar Sw. parameter while opening and closing the rear vehicle doors. The parameter should change between Door Ajar and Door Closed.
• If the parameter does not change between the selected states, refer to Door Ajar Indicator Malfunction (With RPO AXC/AXE) Door Ajar Indicator Malfunction (With RPO AXC/AXE)Door Ajar Indicator Malfunction (Without RPO AXC/AXE) Door Ajar Indicator Malfunction (Without RPO AXC/AXE).
3. Observe the scan tool Rear Closure Ajar Switch parameter while opening and closing the rear liftgate. The parameter should change between Active and Inactive.
• If the parameter does not change between the selected states, refer to Liftgate Ajar Indicator Malfunction (Manual Liftgate) Liftgate Ajar Indicator Malfunction (Manual Liftgate)Liftgate Ajar Indicator Malfunction (Power Liftgate) Liftgate Ajar Indicator Malfunction (Power Liftgate).
4. Cycle the dome lamp switch while observing the scan tool Ctsy. Lamp Actv. Reason parameter. The parameter should change between Manual and Manual Defeat.
• If the parameter does not change, refer to Courtesy Lamp Switch Malfunction.
5. 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 changing between the commanded states, refer to Courtesy Lamp Malfunction.
6. Command the Courtesy Lamps ON and OFF with a scan tool. The liftgate courtesy lamps should turn ON and OFF while changing between the commanded states.
• If the reading lamps do not turn ON and OFF when changing between the commanded states, refer to Liftgate Courtesy Lamp Malfunction.
7. Turn the reading lamps ON and OFF by using the reading lamp switches. The reading lamps should turn ON and OFF while changing between the selected states.
• If the cargo lamps do not turn ON and OFF when changing between the commanded states, refer to Reading Lamp Malfunction.
8. Turn the sunshade lamp ON and OFF by using the sunshade lamp switch. The sunshade lamp should turn ON and OFF while changing between the selected states.
• If the sunshade lamp does not turn ON and OFF when changing between the selected states, refer to Sunshade Illumination Malfunction.
Circuit/System Testing
Courtesy Lamp Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the headlamp switch.
2. Verify that a test lamp illuminates between the ground circuit terminal 8 and B+.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition ON, all doors closed, verify the scan tool Ctsy. Lamp Actv. Reason parameter is Off.
• If the parameter is Manual, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the BCM.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and ground. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual.
• If not the specified value, test the signal circuit for an open/high resistance or short to voltage. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the headlamp switch.
Courtesy Lamp Malfunction
1. Ignition OFF, disconnect the X4 harness connector at the BCM.
2. Ignition ON, verify 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. If the circuit tests normal and the circuit fuse is open, test the courtesy lamp control circuits for a short to ground.
3. Ignition OFF, connect the X4 harness connector at the BCM. Disconnect the harness connector at the appropriate courtesy lamp.
4. Verify that a test lamp illuminates between the ground circuit terminal B and B+.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
5. Connect a test lamp between the control circuit terminal C and ground.
6. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded.
• 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.
7. If all circuits test normal, test or replace the courtesy lamp or courtesy lamp bulb.
Liftgate Courtesy Lamp Malfunction
1. Disconnect the harness connector at the appropriate liftgate courtesy lamp.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5.0 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. Connect a test lamp between the control circuit terminal 2 and ground.
4. Command the Courtesy Lamps 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, replace the liftgate courtesy lamp.
Reading Lamp Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate reading lamp.
2. 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.
3. Ignition ON, verify a test lamp illuminates between the control circuit terminal A and ground.
• 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.
4. If all circuits test normal, test or replace the reading lamp.
Sunshade Illumination Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate sunshade.
2. Test for less than 5 ohms between the ground circuit terminal B and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the control circuit terminal A and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
4. If all circuits test normal, test or replace the sunshade.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Headlamp Switch Replacement Service and Repair
* Refer to the appropriate replacement procedure for the lighting component that requires replacement.
* Control Module References Programming and Relearning for BCM replacement, programming and setup