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Pinpoint Test O : The Tailgate Lock Is Inoperative

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to REMOTE KEYLESS ENTRY AND ALARM for schematic and connector information. Refer to INTERIOR LAMPS for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Handles, Locks, Latches and Entry Systems - System Operation and Component Description .

    Possible Sources 

    • Wiring, terminals or connectors
    • Tailgate lock actuator

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

  3. O1 CHECK THE DOOR LOCK OPERATION

    • Ignition OFF.

    • Check the operation of the door locks using the LHF door lock control switch.

    Do the door locks operate correctly? 

    Yes  GO to  O2
    No  REFER to the Symptom Chart: Electrical .

  4. O2 CHECK THE LOCK CIRCUIT FOR AN OPEN

    NOTE: The following 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: Tailgate Lock Actuator C4814.

    • Connect:
      Lead 1 Measurement / Action Lead 2
      C4814-2
      GFD329131Courtesy of FORD MOTOR COMPANY
      		 Ground

    • NOTE: The BCM only supplies voltage to the actuator momentarily. It is important to monitor the test lamp while pressing the door lock control switch.

      While pressing the door lock control switch in the lock position, monitor the test lamp.

    Does the test lamp momentarily illuminate? 

    Yes  GO to  O3
    No  REPAIR the circuit.

  5. O3 CHECK THE UNLOCK CIRCUIT FOR AN OPEN

    NOTE: The following 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.

    • Connect:
      Lead 1 Measurement / Action Lead 2
      C4814-1
      GFD329131Courtesy of FORD MOTOR COMPANY
      		 Ground

    • NOTE: The BCM only supplies voltage to the actuator momentarily. It is important to monitor the test lamp while pressing the door lock control switch.

      While pressing the door lock control switch in the unlock position, monitor the test lamp.

    Does the test lamp momentarily illuminate? 

    Yes  INSTALL a new tailgate lock actuator. REFER to: Tailgate Latch .
    No  REPAIR the circuit.
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