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

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  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? 
    1. 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  B8 .

      For LTM DTC B2703, go to  B12 .

    2. 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? 
    1. YES  : If the power liftgate control switch is inoperative, go to  B12 .

      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  B8 .

    2. NO  : Go to Pinpoint Test A  to diagnose an inoperative power liftgate.
  3. B3 CHECK THE LIFTGATE HANDLE PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • 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? 
    1. YES  : Go to  B4.
    2. NO  : REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS to diagnose the liftgate handle release switch.
  4. B4 CHECK THE SJB RELEASE CIRCUIT OUTPUT 
    • Disconnect: LTM C4174B
      • Fig 1: Measuring Voltage Between LTM C4174B-12, Circuit CPL10 (GN/WH)
      GF0021152Courtesy of FORD MOTOR CO.
    • Measure the voltage between LTM C4174B-12, circuit CPL10 (GN/WH), harness side and ground while commanding the SJB Liftgate_Release_Ckt PID active and inactive.
    • Is the voltage greater than 10 volts when the Liftgate_Release_Ckt PID is active, and approximately 6 volts when the Liftgate_Release_Ckt PID is inactive? 
    1. YES  : Go to  B16.
    2. NO  : Go to  B5.
  5. B5 CHECK CIRCUIT CPL10 (GN/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB Module C2280D
    • Key in ON position.
      • Fig 2: Measuring Voltage Between LTM C4174B-12, Circuit CPL10 (GN/WH), Harness Side & Ground
      GF0021152Courtesy of FORD MOTOR CO.
    • Measure the voltage between LTM C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  B6.
  6. B6 CHECK CIRCUIT CPL10 (GN/WH) FOR AN OPEN OR SHORT TO GROUND 
      Fig 3: Measuring Resistance Between LTM C4174B-12, Circuit CPL10 (GN/WH)
      GF0021153Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-12, circuit CPL10 (GN/WH), harness side and SJB C2280D-15, circuit CPL10 (GN/WH), harness side; and between LTM C4174B-12, circuit CPL10 (GN/WH), harness side and ground.
    • Is the resistance less than 5 ohms between LTM and the SJB; and greater than 10,000 ohms between LTM and ground? 
    1. YES  : Go to  B7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. B7 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? 
    1. YES  : INSTALL a new SJB module. REPEAT the SJB module self-test.
    2. 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.
  8. B8 CHECK POWER LIFTGATE REAR SWITCH OPERATION 
    • Enter the following diagnostic mode on the diagnostic tool: LTM DataLogger
    • Monitor the LTM PID REAR_OC while operating the power liftgate rear control switch.
    • Does the PID agree with the power liftgate rear control switch status? 
    1. YES  : Go to  B16.
    2. NO  : Go to  B9.
  9. B9 CHECK POWER LIFTGATE REAR SWITCH CIRCUIT OPERATION 
    • Disconnect: LTM C4174B
      • Fig 4: Measuring Resistance Between LTM C4174B-24, Circuit CPR70 (GN)
      GF0021154Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-24, circuit CPR70 (GN), harness side and ground while depressing and releasing the power liftgate rear switch.
    • Is the resistance less than 10 ohms with the power liftgate rear switch depressed; and greater than 10,000 ohms when the power liftgate rear switch is released? 
    1. YES  : Go to  B16.
    2. NO  : Go to  B10.
  10. B10 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Power Liftgate Rear Open/Close Switch C4333
      • Fig 5: Measuring Resistance Between LTM Rear Switch C4333-1, Circuit GD149 (BK/GY)
      GF0030621Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM rear switch C4333-1, circuit GD149 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B11.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  11. B11 CHECK CIRCUIT CPR70 (GN) FOR AN OPEN OR SHORT TO GROUND 
      Fig 6: Measuring Resistance Between LTM C4174B-24, Circuit CPR70 (GN) & Power Liftgate Rear Switch C4333-5
      GF0030622Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-24, circuit CPR70 (GN), harness side and power liftgate rear switch C4333-5, circuit CPR70 (GN), harness side; and between LTM C4174B-24, circuit CPR70 (GN), harness side and ground.
    • Is the resistance less than 5 ohms between LTM and power liftgate rear switch; and greater than 10,000 ohms between LTM and ground? 
    1. YES  : INSTALL a new power liftgate rear switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  12. B12 CHECK POWER LIFTGATE SWITCH OPERATION 
    • Enter the following diagnostic mode on the diagnostic tool: LTM DataLogger
    • Monitor the LTM PID PLGM_SW while operating the power liftgate control switch (instrument panel).
    • Does the PID agree with the switch status? 
    1. YES  : Go to  B16.
    2. NO  : Go to  B13.
  13. B13 CHECK POWER LIFTGATE CONTROL SWITCH CIRCUIT OPERATION 
    • Disconnect: LTM C4174B
      • Fig 7: Measuring Resistance Between LTM C4174B-16, Circuit CPR63 (GY/YE)
      GF0021157Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-16, circuit CPR63 (GY/YE), harness side and ground while depressing and releasing the power liftgate control switch (instrument panel).
    • 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? 
    1. YES  : Go to  B16.
    2. NO  : Go to  B14.
  14. B14 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Liftgate/Traction Control/Hazard Switch C2269
      • Fig 8: Measuring Resistance Between Power Liftgate Control Switch C2269-1, Circuit GD116 (BK/VT)
      GF0030623Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate control switch C2269-1, circuit GD116 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B15.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  15. B15 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN OR SHORT TO GROUND 
      Fig 9: Measuring Resistance Between LTM C4174B-16, Circuit CPR63 (GY/YE) & Power Liftgate Control Switch C2269-5
      GF0030624Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-16, circuit CPR63 (GY/YE), harness side and power liftgate control switch C2269-5, circuit CPR63 (GY/YE), harness side; and between LTM C2269-5, circuit CPR63 (GY/YE), harness side and ground.
    • Is the resistance less than 5 ohms between LTM and power liftgate control switch; and greater than 10,000 ohms between LTM and ground? 
    1. YES  : INSTALL a new liftgate/traction control/hazard switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  16. B16 CHECK FOR CORRECT LTM OPERATION 
    • Disconnect all the LTM connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the 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? 
    1. YES  : INSTALL a new LTM. REFER to Liftgate/Trunk Module (LTM) . REPEAT the LTM self-test.
    2. 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 LTM self-test.
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