Pinpoint Test F: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly
Handles, Locks, Latches and Entry Systems
Pinpoint Test F: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagrams Set 109, Power Liftgate for schematic and connector information. Electrical Diagrams
Refer to Wiring Diagrams Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Electrical Diagrams
NOTE: If the liftgate fails to release electronically, refer to Liftgate Latch Manual Release .
Normal Operation
When the Smart Junction Box (SJB) receives an open request from the liftgate release switch or the Remote Keyless Entry (RKE) (vehicles with power liftgate), the SJB (Smart Junction Box) supplies voltage to the liftgate latch or the Liftgate/Trunk Module (LTM) (vehicles with power liftgate). The liftgate latch has a dedicated ground circuit.
The SJB (Smart Junction Box) sends a voltage signal to the liftgate release switch through the input circuit. When the liftgate release switch is pressed, the voltage signal is routed to ground, signaling the SJB (Smart Junction Box) to release the liftgate. The liftgate release switch has a dedicated ground circuit.
- DTC B2666 (Liftgate Release Switch Circuit Failure)- a continuous and on-demand DTC that sets when the SJB (Smart Junction Box) detects a short to ground on the liftgate release switch input circuit. The DTC also sets if the liftgate release switch is actuated for longer than 2 minutes.
- DTC B273A (Liftgate Release Output Circuit Shorted to Ground)- a continuous DTC that sets when the SJB (Smart Junction Box) detects a short to ground on the liftgate latch release output circuit.
- DTC B273B (Liftgate Release Output Circuit Open or Shorted to Battery Voltage)- a continuous and on-demand DTC that sets when the SJB (Smart Junction Box) detects an open or short to voltage on the liftgate latch release output circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Liftgate release switch
- Liftgate latch
- LTM (Liftgate/Trunk Module)
- SJB (Smart Junction Box)
PINPOINT TEST F : THE LIFTGATE LATCH RELEASE IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.
F1 CHECK THE DOOR LOCK OPERATION
- Lock and unlock the doors using the door lock control switch.
Do the door locks operate correctly?
Yes
GO to F2.
No
GO to Pinpoint Test A. Pinpoint Test A: All Door Locks Are Inoperative
F2 RETRIEVE THE RECORDED SJB (Smart Junction Box) AND LTM (Liftgate/Trunk Module) DTCs FROM THE SELF-TESTS
- Check for recorded SJB (Smart Junction Box) and LTM (Liftgate/Trunk Module) DTCs from the self-tests.
Are any DTCs recorded?
Yes
For DTC B2666, GO to F3.
For DTC B273A, GO to F4.
For DTC B273B, GO to F7.
For all other SJB (Smart Junction Box) DTCs, REFER to DTC Charts. Doors, Hood and Trunk
For any LTM (Liftgate/Trunk Module) DTCs, REFER to Doors, Hood and Trunk.
No
GO to F11.
F3 REPEAT THE SJB (Smart Junction Box) SELF-TEST FOR DTC B2666
- Ignition OFF.
- Disconnect: Liftgate Release Switch C4353.
- Ignition ON.
- Clear the DTCs, then repeat the SJB (Smart Junction Box) self-test.
Is DTC B2666 recorded?
Yes
GO to F5.
No
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch .
F4 REPEAT THE SJB (Smart Junction Box) SELF-TEST FOR DTC B273A
- Ignition OFF.
- Disconnect: Liftgate Latch C4185 (Manual Liftgate) or LTM (Liftgate/Trunk Module) C4174A (Power Liftgate).
- Ignition ON.
- NOTE: DTC B273B may set and should be ignored when carrying out this step.
Clear the DTCs, then repeat the SJB (Smart Junction Box) self-test.
Is DTC B273A present?
Yes
GO to F6.
No
For a manual liftgate, INSTALL a new liftgate latch. REFER to Liftgate Latch .
For a power liftgate, GO to F14.
F5 CHECK THE LIFTGATE RELEASE INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280C.
- Measure the resistance between the SJB (Smart Junction Box) C2280C-7, circuit CPL45 (BN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to F15.
No
REPAIR circuit CPL45 (BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
F6 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280D.
- Measure the resistance between the SJB (Smart Junction Box) C2280D-15, circuit CPL79 (BN/VT), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to F15.
No
REPAIR circuit CPL79 (BN/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
F7 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Liftgate Latch C4185 (Manual Liftgate) or LTM (Liftgate/Trunk Module) C4174A (Power Liftgate).
- Disconnect: SJB (Smart Junction Box) C2280D.
- Ignition ON.
- Measure the voltage between the SJB (Smart Junction Box) C2280D-15, circuit CPL79 (BN/VT), harness side and ground.
Is any voltage present?
Yes
REPAIR circuit CPL79 (BN/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
No
GO to F8.
F8 CHECK FOR SJB (Smart Junction Box) OUTPUT
- Ignition OFF.
- Connect: SJB (Smart Junction Box) C2280D.
- Unlock the doors with the door lock control switch.
- NOTE: The SJB (Smart Junction Box) only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the liftgate release switch.
While activating the liftgate release switch, measure the voltage between the LTM (Liftgate/Trunk Module) C4174A-12, circuit CPL79 (BN/VT), harness side and ground (power liftgate); or between the liftgate latch C4185-1, circuit CPL79 (BN/VT), harness side and ground (manual liftgate).
Is the voltage momentarily greater than 10 volts?
Yes
For a manual liftgate, GO to F10.
For a power liftgate, GO to F14.
No
GO to F9.
F9 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB (Smart Junction Box) C2280D.
- Measure the resistance between the LTM (Liftgate/Trunk Module) C4174A-12, circuit CPL79 (BN/VT), harness side and the SJB (Smart Junction Box) C2280D-15, circuit CPL79 (BN/VT), harness side (power liftgate); or between the liftgate latch C4185-1, circuit CPL79 (BN/VT), harness side and the SJB (Smart Junction Box) C2280D-15, circuit CPL79 (BN/VT), harness side (manual liftgate).
Is the resistance less than 5 ohms?
Yes
GO to F15.
No
REPAIR circuit CPL79 (BN/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
F10 CHECK THE LIFTGATE LATCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the liftgate latch C4185-2, circuit GD149 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new liftgate latch. REFER to Liftgate Latch . CLEAR the DTCs. REPEAT the self-test.
No
REPAIR circuit GD149 (BK/GY) for an open. CLEAR the DTCs. REPEAT the self-test.
F11 CHECK THE LIFTGATE RELEASE SWITCH
- Ignition OFF.
- Disconnect: Liftgate Release Switch C4353.
- Unlock the doors with the door lock control switch.
- Connect a fused jumper wire between the liftgate release switch C4353-2, circuit CPL45 (BN), harness side and the liftgate release switch C4353-1, circuit GD149 (BK), harness side.
Does the liftgate latch release?
Yes
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch . TEST the system for normal operation.
No
REMOVE the jumper wire. GO to F12.
F12 CHECK THE LIFTGATE RELEASE SWITCH GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the liftgate release switch C4353-1, circuit GD149 (BK), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to F13.
No
REPAIR circuit GD149 (BK) for an open. TEST the system for normal operation.
F13 CHECK THE LIFTGATE RELEASE INPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB (Smart Junction Box) C2280C.
- Connect a fused jumper wire between the liftgate release switch C4353-2, circuit CPL45 (BN), harness side and the liftgate release switch C4353-1, circuit GD149 (BK), harness side.
- Measure the resistance between the SJB (Smart Junction Box) C2280C-7, circuit CPL45 (BN), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to F15.
No
REPAIR circuit CPL45 (BN) for an open. TEST the system for normal operation.
F14 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). CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
F15 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) 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 SJB (Smart Junction Box). 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.