Diagnostic Routine J
Diagnostic Routine J
Diagnostic Overview
All The Courtesy Lamps Stay On Continuously
Refer to Wiring Diagram Set 117 for schematic and connector information Electrical Diagrams.
Refer to Wiring Diagram Set 109 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
REFER to Courtesy Lamps .
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect the doors for correct latching.
- Inspect the liftgate for correct latching.
Pinpoint Test
1. CHECK THE DOOR AJAR SWITCH PIDs (Parameter Identifications)
1. Ignition ON.
2. Using a scan tool, view BCM (Body Control Module) PIDs (Parameter Identifications).
3. Monitor the BCM (Body Control Module) DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR PIDs (Parameter Identifications) while opening and closing all the doors.
Do all the door ajar switch PID (Parameter Identification) values agree with the door positions?
2. BYPASS THE SUSPECT DOOR LATCH
1. Disconnect: Suspect Door Latch.
2. Connect:
3. Using a scan tool, view BCM (Body Control Module) PIDs (Parameter Identifications).
4. Monitor the suspect BCM (Body Control Module) DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR PID (Parameter Identification).
Does the PID (Parameter Identification) indicate the door is closed?
3. BYPASS THE DOOR LATCH GROUND CIRCUIT
1. Connect:
2. Monitor the BCM (Body Control Module) DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR PID (Parameter Identification).
Does the PID indicate the door is closed?
4. CHECK THE SUSPECT DOOR AJAR SWITCH INPUT CIRCUIT FOR AN OPEN
1. Disconnect: BCM (Body Control Module) C2280C.
2. Measure:
Is the resistance less than 3 ohms?
5. CHECK THE LIFTGATE AJAR SWITCH PID (Parameter Identification)
1. Monitor the BCM (Body Control Module) DOOR_SW_LUGG PID (Parameter Identification) while opening and closing the liftgate.
Does the liftgate switch PID (Parameter Identification) value agree with the liftgate positions?
6. BYPASS THE LIFTGATE LATCH
1. Ignition OFF.
2. Disconnect: Liftgate Latch.
3. Ignition ON.
4. Monitor the BCM (Body Control Module) DOOR_SW_LUGG PID (Parameter Identification).
5. NOTE: If the fuse fails, repair the liftgate ajar input circuit for a short to voltage.
Connect:
Does the PID (Parameter Identification) indicate the liftgate is closed?
7. CHECK THE LIFTGATE AJAR SWITCH GROUND CIRCUIT FOR AN OPEN
1. Connect:
2. Monitor the BCM (Body Control Module) DOOR_SW_LUGG PID (Parameter Identification).
Does the PID (Parameter Identification) indicate the liftgate is closed?
8. CHECK FOR LTM (Liftgate/Trunk Module) DTCs (Diagnostic Trouble Codes) FROM THE SELF-TEST
1. Using a scan tool, perform LTM (Liftgate/Trunk Module) self-test.
Are any DTCs (Diagnostic Trouble Codes) other than DTC (Diagnostic Trouble Code) B2718 or DTC (Diagnostic Trouble Code) B2721 present?
9. BYPASS THE LTM (Liftgate/Trunk Module)
1. Ignition OFF.
2. Disconnect: LTM (Liftgate/Trunk Module) C4174B.
3. Ignition ON.
4. NOTE: If the fuse fails, repair the liftgate ajar input circuit for a short to voltage.
Connect:
5. Monitor the BCM (Body Control Module) DOOR_SW_LUGG PID (Parameter Identification).
Does the PID (Parameter Identification) indicate the liftgate is closed?
10. CHECK THE LIFTGATE AJAR INPUT CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280C.
3. Measure:
Is the resistance less than 3 ohms?
11. CHECK FOR CORRECT LTM (Liftgate/Trunk Module) OPERATION
1. Disconnect the LTM (Liftgate/Trunk Module) connectors.
2. Repair:
- corrosion (install new connector or terminals - clean module pins)
- corrosion (install new connector or terminals - clean module pins)
- pushed-out pins - install new pins as necessary
3. Reconnect the LTM (Liftgate/Trunk Module) connectors and make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
12. CHECK FOR CORRECT BCM (Body Control Module) OPERATION
1. Disconnect the BCM (Body Control Module) connectors.
2. Repair:
- corrosion (install new connector or terminals - clean module pins)
- corrosion (install new connector or terminals - clean module pins)
- pushed-out pins - install new pins as necessary
3. Reconnect the BCM (Body Control Module) connectors and make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
