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Pinpoint Test A: The Power Tailgate Does Not Unlatch

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to POWER TAILGATE/RETRACTABLE RUNNING BOARDS for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Power Tailgate - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    RGTM B1452:11 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator: Circuit Short To Ground Sets when the RGTM detects a short to ground from the RH tailgate latch release actuator output circuit.
    RGTM B1452:12 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator: Circuit Short To Battery Sets when the RGTM detects a short to battery from the RH tailgate latch release actuator output circuit.
    RGTM B1452:13 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator: Circuit Open Sets when the RGTM detects an open from the RH tailgate latch release actuator output circuit.
    RGTM B15E8:11 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator 2: Circuit Short To Ground Sets when the RGTM detects a short to ground from the LH tailgate latch release actuator output circuit.
    RGTM B15E8:12 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator 2: Circuit Short To Battery Sets when the RGTM detects a short to battery from the LH tailgate latch release actuator output circuit.
    RGTM B15E8:13 Tailgate/Liftgate/Boot/Trunk Latch Release Actuator 2: Circuit Open Sets when the RGTM detects an open from the LH tailgate latch release actuator output circuit.

    Possible Sources 

    • Fuse
    • Wiring, terminals or connectors
    • Communication concern
    • Tailgate Latch RH
    • Tailgate Latch LH
    • BJB
    • RGTM
    • Undervoltage / Overvoltage

    Visual Inspection and Pre-checks 

    • Verify the BJB fuse 37 (30A) is OK

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

  4. A1 CHECK THE TAILGATE LATCH MANUAL RELEASE

    • Mechanically unlatch the tailgate from the exterior release handle.

    Do the both RH and LH tailgate latches release? 

    Yes  GO to  A2
    No  INSTALL a new RH or LH power tailgate latch. REFER to: Tailgate Latch .

  5. A2 CHECK FOR COMMUNICATION TO THE RGTM (REAR GATE TRUNK MODULE)

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    Does the RGTM pass the network test? 

    Yes  GO to  A3
    No  REFER to: Controller Area Network (CAN) Module Communications Network . REFER to: Ethernet Module Communications Network .

  6. A3 CHECK FOR VOLTAGE TO THE POWER TAILGATE LATCH RELEASE MOTOR

    • Ignition OFF.

    • Disconnect suspect Power Tailgate Latch connector RH C4626 or LH C4627.

    • Press the tailgate release switch on the instrument panel or the exterior door handle release switch.

    • Connect:

      Power Tailgate RH Latch Switch 

      Positive Lead Measurement / Action Negative Lead
      C4626-1
      GFD560580Courtesy of FORD MOTOR COMPANY
      		 C4626-5

      Power Tailgate LH Latch Switch 

      Positive Lead Measurement / Action Negative Lead
      C4627-4
      GFD560580Courtesy of FORD MOTOR COMPANY
      		 C4627-8

    • NOTE: The RGTM only supplies voltage to the actuator momentarily. It is important to monitor the test lamp while pressing the tailgate release switch.

      While pressing the tailgate release switch, monitor the test lamp.

    Does the test lamp momentarily illuminate? 

    Yes  Install new RH or LH Power Tailgate latch, REFER to: Tailgate Latch .
    No  GO to  A4

  7. A4 CHECK THE TAILGATE LATCH CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect RGTM C4623.

    • Ignition ON.

    • Measure:

      Tailgate Cinch Latch RH 

      Positive Lead Measurement / Action Negative Lead
      C4626-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4626-5
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      Tailgate Cinch Latch LH 

      Positive Lead Measurement / Action Negative Lead
      C4627-4
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4627-8
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit in question.
    No  GO to  A5

  8. A5 CHECK THE RGTM (REAR GATE TRUNK MODULE) TAILGATE LATCH OUTPUT CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:

      Tailgate Latch RH Switch 

      Positive Lead Measurement / Action Negative Lead
      C4626-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4626-5
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      Tailgate Latch LH Switch 

      Positive Lead Measurement / Action Negative Lead
      C4627-4
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4627-8
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  A6
    No  REPAIR the circuit in question.

  9. A6 CHECK THE TAILGATE LATCH CIRCUITS FOR AN OPEN

    • Connect:

      Tailgate Cinch Latch Switch RH 

      Positive Lead Measurement / Action Negative Lead
      C4626-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C4623-29
      C4626-5
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C4623-31

      Tailgate Cinch Latch Switch LH 

      Positive Lead Measurement / Action Negative Lead
      C4627-4
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C4623-34
      C4627-8
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C4623-36

    Are the resistances less than 3 ohms? 

    Yes  GO to  A7
    No  REPAIR the circuit.

  10. A7 CHECK FOR CORRECT RGTM (REAR GATE TRUNK MODULE) OPERATION

    • Disconnect and inspect all RGTM connectors.

    • Repair:

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

    • Reconnect all the RGTM connectors and 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 TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new RGTM. REFER to: Rear Gate Trunk Module (RGTM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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