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Pinpoint Test N: The Liftgate Latch Release Is Inoperative Or Does Not Latch

  1. Refer to the appropriate Wiring Diagrams for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Handles, Locks, Latches and Entry Systems - Vehicles With: One-Touch Open Driver Window - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM B12E8:11 Liftgate/Tailgate Control/Release Switch: Circuit Short To Ground Set by the BCM when a short to ground is detected on the tailgate release switch input circuit.
    BCM B14A9:11 Liftgate/Decklid Release Output: Circuit Short To Ground Set by the BCM when a short to ground is detected on the tailgate release actuator circuit.
    BCM B14A9:15 Liftgate/Decklid Release Output: Circuit Short To Battery Or Open Set by the BCM when a short to voltage or open is detected on the tailgate release actuator circuit.
    BCM B1540:11 Rear Cargo Door Release: Circuit Short To Ground Set by the BCM when it detects a short to ground on the cargo door latch release circuit.
    BCM B1540:15 Rear Cargo Door Release: Circuit Short To Battery Or Open Set by the BCM when it detects a short to power or open on the cargo door latch release circuit.

    Possible Sources 

    • Fuse
    • Wiring, terminals or connectors
    • Liftgate release switch
    • Liftgate latch
    • BCM
    • BJB

    Visual Inspection and Pre-checks 

    • Inspect the BJB fuse 19 (10A) and make sure it is OK.

  2. N1 CHECK THE LIFTGATE LATCH

    • Close the liftgate

    Does the liftgate latch? 

    Yes  GO to  N3
    No  GO to  N2

  3. N2 CHECK THE LIFTGATE LATCH OPERATION

    • Ignition OFF.

    • Disconnect Liftgate Latch C4339.

    • CHECK the operation of the latch with a screwdriver

    Does the liftgate latch fully latch (2 clicks)? 

    Yes  INSTALL a new liftgate latch. REFER to: Liftgate Latch .
    No  REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible cause of the circuit short in the liftgate latch release circuit.

  4. N3 PERFORM THE BCM (BODY CONTROL MODULE) SELF-TEST

    • Ignition ON.

    • Using a diagnostic scan tool, perform the BCM self-test.

    Are any DTC Diagnostic Trouble Codes (DTCs) present? 

    Yes  For DTC B12E8:11 GO to  N4 For DTC B14A9:11, B14A9:15, B1540:11 and B1540:15 GO to  N10
    No  GO to  N6

  5. N4 CHECK THE LIFTGATE RELEASE SWITCH

    • Ignition OFF.

    • Disconnect Liftgate Release Switch C4353.

    • Ignition ON.

    • Using a diagnostic scan tool, perform the BCM self-test.

    Is DTC B12E8:11 still present? 

    Yes  GO to  N5
    No  INSTALL a new liftgate release switch.

  6. N5 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect BCM C2280F.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280F-31
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N19
    No  REPAIR the circuit.

  7. N6 CHECK THE BCM (BODY CONTROL MODULE) LIFTGATE RELEASE SWITCH INPUT USING THE TRUNK/LIFTGATE RELEASE SWITCH (TRNK/LG_R_SW) PID (PARAMETER IDENTIFICATION)

    • Using a diagnostic scan tool, view the BCM Parameter Identifications (PIDs).

    • Using a diagnostic scan tool, monitor the BCMPID TRNK/LG_R_SW while pressing the liftgate release switch.

    Does the PID indicate the switch is pressed? 

    Yes  VERIFY the BJB fuse 9 (10A) is OK. If OK, for a liftgate GO to  N10, for cargo doors. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit fault.
    No  GO to  N7

  8. N7 CHECK THE LIFTGATE RELEASE SWITCH

    • Ignition OFF.

    • Disconnect Liftgate Release Switch C4353.

    • Ignition ON.

    • Unlock the doors with the door lock control switch.

    • Momentarily connect:
      Positive Lead Measurement / Action Negative Lead
      C4353-2
      GFD574219Courtesy of FORD MOTOR COMPANY
      		 C4353-1

    Does the liftgate latch release? 

    Yes  INSTALL a new liftgate release switch.
    No  GO to  N8

  9. N8 CHECK THE LIFTGATE RELEASE SWITCH GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4353-1
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  N9
    No  REPAIR the circuit.

  10. N9 CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR AN OPEN

    • Disconnect BCM C2280F.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280F-31
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 C4353-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  N19
    No  REPAIR the circuit.

  11. N10 CHECK THE LIFTGATE LATCH

    NOTE: The following test step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

    • Ignition OFF.

    • Disconnect Liftgate Latch C4339.

    • Ignition ON.

    • Unlock the doors with the door lock control switch.

    • Connect:
      Positive Lead Measurement / Action Negative Lead
      C4339-1
      GFD574217Courtesy of FORD MOTOR COMPANY
      		 C4339-2

    • Observe the test lamp while pressing the liftgate release switch.

    Does the test lamp momentarily illuminate? 

    Yes  INSTALL a new liftgate latch.
    No  GO to  N11

  12. N11 CHECK THE LIFTGATE LATCH GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4339-2
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  N12
    No  REPAIR the circuit.

  13. N12 CHECK THE BCM (BODY CONTROL MODULE) LIFTGATE RELEASE CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect BCM C2280F.

    • Disconnect BJB C1035A.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280F-10
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 C1035A-8

    Is the resistance less than 3 ohms? 

    Yes  GO to  N13
    No  REPAIR the circuit.

  14. N13 CHECK THE BCM (BODY CONTROL MODULE) LIFTGATE RELEASE CIRCUIT FOR A SHORT TO VOLTAGE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280F-10
      GFD574218Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  N14

  15. N14 CHECK THE BCM (BODY CONTROL MODULE) LIFTGATE RELEASE CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280F-10
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N15
    No  REPAIR the circuit.

  16. N15 CHECK THE BJB (BATTERY JUNCTION BOX) LIFTGATE RELEASE OUTPUT CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4339-1
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 C1035A-8

    Is the resistance less than 3 ohms? 

    Yes  GO to  N16
    No  REPAIR the circuit.

  17. N16 CHECK THE BJB (BATTERY JUNCTION BOX) LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4339-1
      GFD574218Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  N17

  18. N17 CHECK THE BJB (BATTERY JUNCTION BOX) LIFTGATE RELEASE OUTPUT CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4339-1
      GFD574216Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N18
    No  REPAIR the circuit.

  19. N18 CHECK THE BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Connect BJB C1035A.

    • Connect Liftgate latch C4339.

    • Close the liftgate

    • Momentarily connect:
      Positive Lead Measurement / Action Negative Lead
      C2280F-10
      GFD574219Courtesy of FORD MOTOR COMPANY
      		 Ground

    Does the liftgate latch release? 

    Yes  GO to  N19
    No  GO to  N20

  20. N19 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Disconnect and inspect all BCM connectors.

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the BCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. REFER to: BODY CONTROL MODULE (BCM) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  21. N20 CHECK FOR CORRECT BJB (BATTERY JUNCTION BOX) OPERATION

    • Disconnect and inspect all BJB connectors.

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the BJB connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, install a new BJB
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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