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Pinpoint Test B: The Power Liftgate Is Inoperative From An Individual Switch

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 RETRIEVE THE DTCs FROM THE LTM  AND THE SJB 
    • Use the recorded LTM  DTCs and SJB  DTCs from the continuous and self-tests.
    • Are any power liftgate DTCs present? 
    • Yes  : For SJB  DTC B2666, REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS to diagnose the liftgate handle release switch.

      For SJB  module DTC B273A or B273B, GO to  B4.

      For LTM  DTC B1105, GO to  B7.

      For LTM  DTC B2703, GO to  B11.

    • No  : GO to  B2.
  2. B2 CHECK THE OPERATION OF THE POWER LIFTGATE SWITCHES 
    • NOTE: Make sure the power liftgate is ON (enabled) in the message center.
    • Close the liftgate to the full closed position (manually if necessary).
    • Electronically unlock the vehicle.
    • Activate the power liftgate from the power liftgate control switch (instrument panel).
    • Activate the power liftgate from the remote transmitter.
    • Activate the power liftgate from the liftgate exterior handle.
    • With the liftgate in the open position, activate the power liftgate from the power liftgate rear control switch (quarter trim panel).
    • Does the power liftgate open/close from at least one switch? 
    • Yes  : If the power liftgate control switch is inoperative, GO to  B11.

      If the exterior handle is inoperative, GO to B3.

      If the remote transmitter is inoperative, GO to SYMPTOM CHART .

      If the power liftgate rear control switch is inoperative, GO to  B7.

    • No  : Go To PINPOINT TEST A  to diagnose an inoperative power liftgate.
  3. B3 CHECK THE LIFTGATE HANDLE PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - SJB  .
    • Monitor the SJB  PID GATE_SW while activating the liftgate release handle.
    • Does the switch change states from INACTIVE to ACTIVE when the liftgate release handle is activated? 
  4. B4 CHECK CIRCUIT CPL79 (BN/VT) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: LTM  C4174A.
    • Disconnect: SJB  Module C2280D.
    • Ignition ON.
    • Measure the voltage between LTM  C4174A-12, circuit CPL79 (BN/VT), harness side and ground.
      Fig 1: Measuring Voltage Between LTM C4174A-12 And Ground
      G06070723Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR the circuit. CLEAR the DTCs. REPEAT the SJB  self-test.
    • No  : GO to B5.
  5. B5 CHECK CIRCUIT CPL79 (BN/VT) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between LTM  C4174A-12, circuit CPL79 (BN/VT), harness side and SJB  C2280D-15, circuit CPL79 (BN/VT), harness side; and between LTM  C4174A-12, circuit CPL79 (BN/VT), harness side and ground.
      Fig 2: Measuring Resistance Between LTM C4174A-12 And SJB C2280D-15
      G06070724Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between LTM and the SJB; and greater than 10,000 ohms between LTM and ground? 
    • Yes  : GO to B6.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the SJB  self-test.
  6. B6 CHECK FOR CORRECT SJB MODULE OPERATION 
    • Disconnect all the SJB  and LTM  connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the SJB  and LTM  connectors and make sure they are seated correctly.
    • Make sure the liftgate is fully CLOSED.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new SJB  module.

      REPEAT the SJB  module self-test.

    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the SJB  module self-test.
  7. B7 CHECK THE REAR/OPEN SWITCH (REAR_OC) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - LTM  .
    • Monitor the LTM  PID REAR_OC while operating the power liftgate rear control switch.
    • Does the PID state change or agree with the rear control switch status? 
    • Yes  : GO to  B15.
    • No  : GO to B8.
  8. B8 CHECK POWER LIFTGATE REAR SWITCH CIRCUIT OPERATION 
    • Disconnect: LTM  C4174A.
    • Measure the resistance between LTM  C4174A-24, circuit CPR89 (BN/BU), harness side and ground while depressing and releasing the power liftgate rear switch.
      Fig 3: Measuring Resistance Between LTM C4174A-24 And Ground
      G06070725Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the power liftgate rear switch depressed, and greater than 10,000 ohms when the power liftgate rear switch is released? 
    • Yes  : GO to  B15.
    • No  : GO to B9.
  9. B9 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Power Liftgate Rear Open/Close Switch C4216.
    • Measure the resistance between power liftgate rear switch C4216-2, circuit GD149 (BK/GY), harness side and ground.
      Fig 4: Measuring Resistance Between Power Liftgate Rear Switch C4216-2 And Ground
      G06070726Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B10.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  10. B10 CHECK CIRCUIT CPR89 (BN/BU) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between LTM  C4174A-24, circuit CPR89 (BN/BU), harness side and power liftgate rear switch C4216-6, circuit CPR89 (BN/BU), harness side; and between LTM  C4174A-24, circuit CPR89 (BN/BU), harness side and ground.
      Fig 5: Measuring Resistance Between LTM C4174A-24 And Power Liftgate Rear Switch C4216-6
      G06070727Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between LTM and power liftgate rear switch; and greater than 10,000 ohms between LTM and ground? 
    • Yes  : INSTALL a new power liftgate rear switch. CLEAR the DTCs. REPEAT the LTM  self-test.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  11. B11 CHECK POWER LIFTGATE SWITCH OPERATION 
    • Enter the following diagnostic mode on the scan tool: DataLogger - LTM  .
    • Monitor the LTM  PID PLGM_SW while operating the power liftgate control switch (instrument panel).
    • Does the PID state change/agree with the switch status? 
    • Yes  : GO to  B15.
    • No  : GO to B12.
  12. B12 CHECK POWER LIFTGATE CONTROL SWITCH CIRCUIT OPERATION 
    • Disconnect: LTM  C4174A.
    • Measure the resistance between LTM  C4174A-16, circuit CPR63 (GY/YE), harness side and ground while depressing and releasing the power liftgate control switch (instrument panel).
      Fig 6: Measuring Resistance Between LTM C4174A-16 And Ground
      G06070728Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the power liftgate control switch depressed, and greater than 10,000 ohms when the power liftgate control switch is released? 
    • Yes  : GO to  B15.
    • No  : GO to B13.
  13. B13 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Liftgate Control Switch C2269.
    • Measure the resistance between power liftgate control switch C2269-2, circuit GD114 (BK/BU), harness side and ground.
      Fig 7: Measuring Resistance Between Power Liftgate Control Switch C2269-2 And Ground
      G06070726Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B14.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  14. B14 CHECK CIRCUIT CPR63 (GY/YE) FOR AN OPEN OR SHORT TO GROUND 
    • Measure the resistance between LTM  C4174A-16, circuit CPR63 (GY/YE), harness side and power liftgate control switch C2269-6, circuit CPR63 (GY/YE), harness side; and between LTM  C4174A-16, circuit CPR63 (GY/YE), harness side and ground.
      Fig 8: Measuring Resistance Between LTM C4174A-16 And Power Liftgate Control Switch C2269-6
      G06070730Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between LTM and power liftgate control switch; and greater than 10,000 ohms between LTM and ground? 
    • Yes  : INSTALL a new liftgate control switch. CLEAR the DTCs. REPEAT the LTM  self-test.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  15. B15 CHECK FOR CORRECT LTM OPERATION 
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