Pinpoint Test F: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly

Handles, Locks, Latches and Entry Systems






Pinpoint Tests

Pinpoint Test F: The Liftgate Latch Release Is Inoperative/Does Not Operate Correctly

Refer to Wiring Diagram Set 110, Power Door Locks 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. The DTC is also set 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 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 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
- SJB



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 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.

NOTE: If the liftgate latch fails to open electronically, it can be opened with the mechanical release. Refer to Liftgate Latch Manual Release Procedures.

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F1 RETRIEVE THE RECORDED SJB AND LTM DTCs FROM THE SELF-TESTS


- Check for recorded SJB and LTM DTCs from the self-tests.
- Are any DTCs recorded?

Yes
For SJB DTC B2666, GO to F2.

For SJB DTC B273A, GO to F4.

For SJB DTC B273B, GO to F6 (manual liftgate) or GO to F7 (power liftgate).

For all other SJB DTCs, REFER to DTC Charts. Diagnostic Trouble Code Descriptions

For any LTM DTCs, REFER to Doors, Hood and Trunk.

No
GO to F11.

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F2 REPEAT THE SJB SELF-TEST FOR DTC B2666


- Disconnect: Liftgate Release Switch C4353 (Manual Liftgate) or C4216 (Power Liftgate) .
- Clear the DTCs, then repeat the SJB self test.
- Is DTC B2666 recorded?

Yes
GO to F3.

No
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch - Manual Liftgate Release Switch - Manual or Liftgate Release Switch - Power Liftgate Release Switch - Power. TEST the system for normal operation.

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F3 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280c .
- Measure the resistance between the SJB C2280c-7, circuit CPL45 (BN), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to F15.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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F4 REPEAT THE SJB SELF-TEST FOR DTC B273A


- Disconnect: Liftgate Latch C479 (Manual Liftgate) or Power Liftgate Module C4174b (Power Liftgate) .
- NOTE: DTC B273B may set and should be ignored when carrying out this step.
- Clear the DTCs, then repeat the SJB self-test.
- Is DTC B273A present?

Yes
GO to F5.

No
For a manual liftgate, INSTALL a new liftgate latch. REFER to Liftgate Latch - Manual Liftgate Latch - Manual. TEST the system for normal operation.

For a power liftgate, GO to F14.

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F5 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280d .
- Measure the resistance between the SJB C2280d-15, circuit CPL10 (GN/WH), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to F15.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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F6 CHECK FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: Liftgate Latch C479 or LTM C4174b .
- Ignition ON.
- Measure the voltage between the LTM C4174b-12, circuit CPL10 (GN/WH), harness side and ground; or between the liftgate latch C479-1, circuit CPL10 (GN/WH), harness side and ground.




- Is any voltage present?

Yes
GO to F7.

No
GO to F8.

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F7 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280d .
- Ignition ON.
- Measure the voltage between the SJB C2280d-15, circuit CPL10 (GN/WH), harness side and ground.




- Is any voltage present?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to F15.

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F8 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, measure the voltage between the LTM C4174b-12, circuit CPL10 (GN/WH), harness side and ground (power liftgate); or between the liftgate latch C479-1, circuit CPL10 (GN/WH), harness side and ground (manual liftgate).




- Is the voltage greater than 10 volts when the switch is activated?

Yes
GO to F10.

No
GO to F9.

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F9 CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR AN OPEN


- Disconnect: SJB C2280d .
- Measure the resistance between the LTM C4174b-12, circuit CPL10 (GN/WH), harness side and the SJB C2280d-15, circuit CPL10 (GN/WH), harness side (power liftgate); or between the liftgate latch C479-1, circuit CPL10 (GN/WH), harness side and the SJB C2280d-15, circuit CPL10 (GN/WH), harness side (manual liftgate).




- Is the resistance less than 5 ohms?

Yes
GO to F15.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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F10 CHECK THE LIFTGATE LATCH GROUND CIRCUIT FOR AN OPEN


- Measure the resistance between the liftgate latch C479-2, circuit GD149 (BK/GY), 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 - Manual Liftgate Latch - Manual. CLEAR the DTCs. REPEAT the self-test.

For a power liftgate, GO to F14.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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F11 CHECK THE LIFTGATE RELEASE SWITCH


- Disconnect: Liftgate Release Switch C4216 .
- Unlock the doors with the door lock control switch.
- Connect a fused jumper wire between the liftgate release switch C4216-3, circuit CPL45 (BN), harness side and the liftgate release switch C4216-4, circuit GD149 (BK/GY), harness side.




- Does the liftgate latch release?

Yes
INSTALL a new liftgate release switch. REFER to Liftgate Release Switch - Power Liftgate Release Switch - Power. TEST the system for normal operation.

No
REMOVE the jumper wire. GO to F12.

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F12 CHECK THE LIFTGATE RELEASE SWITCH GROUND CIRCUIT FOR AN OPEN


- Disconnect: Negative Battery Cable .
- Measure the resistance between the liftgate release switch C4216-4, circuit GD149 (BK/GY), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to F13.

No
REPAIR the circuit. TEST the system for normal operation.

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F13 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR AN OPEN


- Connect a fused jumper wire between the liftgate release switch C4216-3, circuit CPL45 (BN), harness side and the liftgate release switch C4216-4, circuit GD149 (BK/GY), 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 F15.

No
REPAIR the circuit. TEST the system for normal operation.

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F14 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 Doors, Hood and Trunk. 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.

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F15 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 Body Control Systems. 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.

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