Pinpoint Test G: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly
Handles, Locks, Latches and Entry Systems
Pinpoint Tests
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. Diagrams By Number
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 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 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 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 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 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 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
- SJB
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. Refer to Battery, Mounting and Cables Battery Disconnect.
NOTE: If the liftgate latch fails to open electronically, it can be opened with the mechanical release. Refer to Liftgate Latch Manual Release Procedures.
-------------------------------------------------
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 AND LTM SELF-TESTS
- Check the recorded results from the SJB and LTM self-tests.
- Are any DTCs present?
Yes
For any LTM DTC, REFER to Body Closures Testing and Inspection.
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. Diagnostic Trouble Code Tests and Associated Procedures
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 self-test.
- Is DTC B2666 still present?
Yes
GO to G4.
No
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
G4 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB 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 (SHORT TO GROUND)
- Ignition OFF.
- Disconnect: Liftgate Latch C457 or LTM 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 self-test.
- Is DTC B273B present?
Yes
For a manual liftgate, INSTALL a new liftgate latch. REFER to Liftgate Latch [1][2]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 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 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 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 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 C2280d .
- Ignition ON.
- Measure the voltage between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and ground; or between the LTM 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 OUTPUT
- Ignition OFF.
- Unlock the doors with the door lock control switch.
- NOTE: The SJB 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 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 C2280d .
- Measure the resistance between the liftgate latch C457-1, circuit CPL10 (GN/WH), harness side and the SJB C2280d-15, circuit CPL10 (GN/WH), harness side; or between the LTM C4174b-12, circuit CPL10 (GN/WH), harness side and the SJB 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 [1][2]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 Service and Repair. 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 C2280c .
- Measure the resistance between the SJB 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 OPERATION
- Disconnect all the LTM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the LTM 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. REFER to Body Closures Service and Repair. 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 OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. REFER to Multifunction Electronic Modules Service and Repair. 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.
-------------------------------------------------