Pinpoint Test E: All The Courtesy Lamps Stay On Continuously
Interior Lighting
Pinpoint Test E: All The Courtesy Lamps Stay On Continuously
Normal Operation
The Body Control Module (BCM) sends a voltage signal to each door ajar switch, which is routed to ground when the door is closed (the door ajar switch is closed when the door is closed). When the door is opened, the signal to ground is interrupted indicating an open door to the BCM (Body Control Module).
The BCM (Body Control Module) also sends a voltage signal to the liftgate ajar switch (manual liftgate) or the Liftgate/Trunk Module (LTM) (power liftgate).
For vehicles with a manual liftgate, the voltage signal is then routed to ground through the liftgate ajar switch. The liftgate ajar switch is closed when the liftgate is closed. When the liftgate is opened, the signal to ground is interrupted, indicating an open liftgate to the BCM (Body Control Module).
For vehicles with a power liftgate, the LTM (Liftgate/Trunk Module) provides ground to the BCM (Body Control Module) through the liftgate ajar input circuit when the liftgate is closed. When the liftgate is opened, the LTM (Liftgate/Trunk Module) removes ground, indicating an open liftgate to the BCM (Body Control Module).
Voltage is provided to the courtesy lamps when the BCM (Body Control Module) detects an open door or a liftgate.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door latch
- Liftgate latch (manual liftgate)
- LTM (Liftgate/Trunk Module) (power liftgate)
- BCM (Body Control Module)
PINPOINT TEST E : ALL THE COURTESY LAMPS STAY ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
E1 CHECK THE DOOR AND LIFTGATE AJAR SWITCH PIDs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) DataLogger.
- Monitor the BCM (Body Control Module) door and liftgate ajar switch PIDs (DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR, DOOR_SW_LUGG) while opening and closing all the doors and the liftgate.
Do all the door ajar and liftgate switch PID values agree with the door and liftgate positions?
Yes
If the interior courtesy lamps are illuminated, GO to Pinpoint Test F. Pinpoint Test F: The Interior Courtesy Lamps Stay On Continuously
If the puddle lamps are illuminated, GO to Pinpoint Test G. Pinpoint Test G: The Puddle Lamps Stay On Continuously
No
For any door, GO to E2.
For a power liftgate, GO to E5.
For a manual liftgate, GO to E6.
E2 BYPASS THE SUSPECT DOOR LATCH
- Disconnect: Suspect Door Latch.
- Connect a fused jumper wire between the suspect door latch connector pins, harness side as follows:
Suspect Door Latch Connector-Pin Circuit Connector-Pin Circuit LH front C525-5 CPL26 (GN/VT) C525-6 GD133 (BK) RH front C603-5 CPL31 (WH) C603-6 GD140 (BK/GN) LH rear C704-5 CPL36 (GN) C704-6 GD126 (BK/WH) RH rear C804-5 CPL39 (YE) C804-6 GD140 (BK/GN)
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) DataLogger.
- Monitor the suspect BCM (Body Control Module) door ajar switch PID (DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR).
Does the PID indicate the door is closed?
Yes
REMOVE the jumper wire. INSTALL a new door ajar latch for the latch in question. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to E3.
E3 BYPASS THE DOOR LATCH GROUND CIRCUIT
- Connect a fused jumper wire between the suspect door latch connector, harness side and ground as follows:
Suspect Door Latch Connector-Pin Circuit LH front C525-5 CPL26 (GN/VT) RH front C603-5 CPL31 (WH) LH rear C704-5 CPL36 (GN) RH rear C804-5 CPL39 (YE)
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) DataLogger.
- Monitor the suspect BCM (Body Control Module) door ajar switch PID (DOOR_SW_DRVR, DOOR_SW_PSGR, DOOR_SW_LR, DOOR_SW_RR).
Does the PID indicate the door is closed?
Yes
REMOVE the jumper wire. REPAIR door latch ground circuit in question for an open. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to E4.
E4 CHECK THE SUSPECT DOOR AJAR SWITCH INPUT CIRCUIT FOR AN OPEN
- Disconnect: BCM (Body Control Module) C2280C.
- Measure the resistance between the suspect door latch connector, harness side and the BCM (Body Control Module) connector, harness side as follows:
Suspect Door Latch Connector-Pin BCM (Body Control Module) Connector-Pin Circuit LH front C525-5C2280C-9 CPL26 (GN/VT) RH front C603-5C2280C-5 CPL31 (WH) LH rear C704-5C2280C-20 CPL36 (GN) RH rear C804-5C2280C-21 CPL39 (YE)
Is the resistance less than 5 ohms?
Yes
GO to E10.
No
REPAIR the door ajar input circuit in question for an open. TEST the system for normal operation.
E5 CHECK THE LTM (Liftgate/Trunk Module) DTCs FROM THE SELF-TEST
- Use the recorded results from the LTM (Liftgate/Trunk Module) self-test.
Are any DTCs other than DTC B2718 or DTC B2721 present?
Yes
REFER to Doors, Hood and Trunk.
No
GO to E6.
E6 BYPASS THE LIFTGATE LATCH (MANUAL LIFTGATE) OR THE LTM (Liftgate/Trunk Module) (POWER LIFTGATE)
- Ignition OFF.
- Disconnect: Liftgate Latch C479 (manual liftgate).
- Disconnect: LTM (Liftgate/Trunk Module) C4174B (power liftgate).
- Ignition ON.
- For a manual liftgate, connect a fused jumper wire between the liftgate latch C479-4, circuit CPL58 (GY/OG), harness side and the liftgate latch C479-3, circuit GD149 (BK/GY), harness side.
- NOTE: If the fuse fails, repair circuit CPL58 (GY/OG) for a short to voltage.
For a power liftgate, connect a fused jumper wire between the LTM (Liftgate/Trunk Module) C4174B-2, circuit CPL58 (GY/OG), harness side and ground.
- Monitor the BCM (Body Control Module) liftgate ajar switch PID (DOOR_SW_LUGG).
Does the PID indicate the liftgate is closed?
Yes
REMOVE the jumper wire.
For a manual liftgate, INSTALL a new manual liftgate latch. TEST the system for normal operation.
For a power liftgate, GO to E9.
No
For a manual liftgate, REMOVE the jumper wire. GO to E7.
For a power liftgate, LEAVE the jumper wire connected. GO to E8.
E7 CHECK THE LIFTGATE AJAR SWITCH GROUND CIRCUIT FOR AN OPEN
- Connect a fused jumper wire between the liftgate latch C479-4, circuit CPL58 (GY/OG), harness side and ground.
- Monitor the BCM (Body Control Module) liftgate ajar switch PID (DOOR_SW_LUGG).
Does the PID indicate the liftgate is closed?
Yes
REMOVE the jumper wire. REPAIR circuit GD149 (BK/GY) for an open. TEST the system for normal operation.
No
LEAVE the jumper wire connected. GO to E8.
E8 CHECK THE LIFTGATE AJAR INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280C.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the BCM (Body Control Module) C2280C-19, circuit CPL58 (GY/OG), harness side and ground.
Is the resistance less than 5 ohms?
Yes
REMOVE the jumper wire. GO to E10.
No
REMOVE the jumper wire. REPAIR circuit CPL58 (GY/OG) for an open. TEST the system for normal operation.
E9 CHECK FOR CORRECT LTM (Liftgate/Trunk Module) OPERATION
- Disconnect all the LTM (Liftgate/Trunk Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the LTM (Liftgate/Trunk Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new LTM (Liftgate/Trunk Module). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
E10 CHECK FOR CORRECT BCM (Body Control Module) OPERATION
- Disconnect all the BCM (Body Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM (Body Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.