Pinpoint Test G: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly
Handles, Locks, Latches and Entry Systems
Pinpoint Test G: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information Electrical Diagrams.
Normal Operation
When the Smart Junction Box (SJB) receives an open request from the liftgate release switch or 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. This DTC may also set if the liftgate release switch is pressed for longer than 2 minutes.
- DTC B273A (Liftgate Release Output Circuit Short 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 Short 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 release actuator (integral to the liftgate latch)
- LTM (Liftgate/Trunk Module)
- SJB (Smart Junction Box)
PINPOINT TEST G : THE LIFTGATE LATCH RELEASE IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.
NOTE: If the liftgate latch fails to open electronically, it can be opened with the mechanical release. Refer to Liftgate Latch Manual Release .
G1 CHECK THE DOOR LOCK OPERATION
- Lock and unlock the doors using a door lock control switch.
Do the door locks operate correctly?
Yes
GO to G2.
No
GO to Pinpoint Test A. Pinpoint Test A: All Door Locks Are Inoperative
G2 CHECK THE RECORDED DTCs FROM THE SJB (Smart Junction Box) AND LTM (Liftgate/Trunk Module) SELF-TESTS
- Check the recorded results from the SJB (Smart Junction Box) and LTM (Liftgate/Trunk Module) self-tests.
Are any DTCs present?
Yes
For any LTM (Liftgate/Trunk Module) DTC, REFER to Doors, Hood and Trunk.
For DTC B2666, GO to G3.
For DTC B273A, GO to G5.
For DTC B273B, GO to G7 (manual liftgate) or GO to G8 (power liftgate).
For all other DTCs, REFER to DTC Charts. Doors, Hood and Trunk
No
GO to G12.
G3 CHECK THE LIFTGATE RELEASE SWITCH (SHORT TO GROUND)
- Disconnect: Liftgate Release Switch C4340.
- Clear the DTC and carry out the SJB (Smart Junction Box) self-test.
Is DTC B2666 still present?
Yes
GO to G4.
No
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch . CLEAR the DTCs. REPEAT the self-test.
G4 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280C.
- Measure the resistance between the liftgate release switch C4340-2, circuit CPL45 (BN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to G16.
No
REPAIR circuit CPL45 (BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
G5 CHECK THE LIFTGATE LATCH (MANUAL LIFTGATE) OR THE LTM (Liftgate/Trunk Module) (SHORT TO GROUND)
- Ignition OFF.
- Disconnect: Liftgate Latch C457 or LTM (Liftgate/Trunk Module) C4174B.
- Ignition ON.
- NOTE: It may be normal for DTC B273A to be present when carrying out this step and should be ignored.
Clear the DTC and carry out the SJB (Smart Junction Box) self-test.
Is DTC B273B present?
Yes
For a manual liftgate, INSTALL a new liftgate latch. REFER to Liftgate Latch . CLEAR the DTCs. REPEAT the self-test.
For a power liftgate, GO to G15.
No
GO to G6.
G6 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280D.
- For vehicles with a manual liftgate, measure the resistance between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and ground.
- For vehicles with a power liftgate, measure the resistance between the LTM (Liftgate/Trunk Module) C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to G16.
No
REPAIR circuit CPL10 (GN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
G7 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: Liftgate Latch C457.
- Disconnect: LTM (Liftgate/Trunk Module) C4174B (If Equipped).
- Ignition ON.
- Measure the voltage between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and ground; or between the LTM (Liftgate/Trunk Module) C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to G8.
No
GO to G9.
G8 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280D.
- Ignition ON.
- Measure the voltage between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and ground; or between the LTM (Liftgate/Trunk Module) C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
Is any voltage present?
Yes
REPAIR circuit CPL10 (GN/WH) for a short to voltage. TEST the system for normal operation.
No
GO to G16.
G9 CHECK FOR SJB (Smart Junction Box) OUTPUT
- Ignition OFF.
- Unlock the doors with the door lock control switch.
- NOTE: The SJB (Smart Junction Box) only supplies voltage for the liftgate latch release momentarily. It is important to monitor the meter while activating the liftgate release switch.
While activating the liftgate release switch (pull the liftgate release handle), measure the voltage between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and ground; or between the LTM (Liftgate/Trunk Module) C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
Is the voltage momentarily greater than 10 volts?
Yes
GO to G11.
No
GO to G10.
G10 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB (Smart Junction Box) C2280D.
- Measure the resistance between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and the SJB (Smart Junction Box) C2280D-15, circuit CPL10 (GN/WH), harness side; or between the LTM (Liftgate/Trunk Module) C4174B-12, circuit CPL10 (GN/WH), harness side and the SJB (Smart Junction Box) C2280D-15, circuit CPL10 (GN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to G16.
No
REPAIR circuit CPL10 (GN/WH) for an open. CLEAR the DTCs. REPEAT the self-test.
G11 CHECK THE LIFTGATE LATCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the liftgate latch C457-2, circuit GD150 (BK/WH), harness side and ground.
Is the resistance less than 5 ohms?
Yes
For a manual liftgate, INSTALL a new liftgate latch. REFER to Liftgate Latch . CLEAR the DTCs. REPEAT the self-test.
For a power liftgate, GO to G15.
No
REPAIR circuit GD150 (BK/WH) for an open. CLEAR the DTCs. REPEAT the self-test.
G12 CHECK THE LIFTGATE RELEASE SWITCH
- Ignition OFF.
- Disconnect: Liftgate Release Switch C4340.
- Unlock the doors with the door lock control switch.
- Connect a fused jumper wire between the liftgate release switch C4340-2, circuit CPL45 (BN), harness side and the liftgate release switch C4340-1, circuit GD150 (BK/WH), 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 G13.
G13 CHECK THE LIFTGATE RELEASE SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the liftgate release switch C4340-1, circuit GD150 (BK/WH), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to G14.
No
REPAIR circuit GD150 (BK/WH) for an open. TEST the system for normal operation.
G14 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR AN OPEN
- Connect a fused jumper wire between the liftgate release switch C4340-2, circuit CPL45 (BN), harness side and the liftgate release switch C4340-1, circuit GD150 (BK/WH), harness side.
- 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 less than 5 ohms?
Yes
GO to G16.
No
REPAIR circuit CPL45 (BN) for an open. TEST the system for normal operation.
G15 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.
G16 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.