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Pinpoint Test E: The Power Liftgate Chime Is Inoperative

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. E1 CHECK FOR VOLTAGE TO THE POWER LIFTGATE CHIME 
    • Key in ON position.
    • Set the parking brake to the ON position.
    • Open the liftgate.
      • Fig 1: Measuring Voltage Between Power Liftgate Chime C4186-1, Circuit CPR56 (VT/BN)
      GF0021162Courtesy of FORD MOTOR CO.
      NOTE: The LTM applies voltage to the power liftgate chime for one second after the rear power liftgate switch is pressed, when the transmission is not in the PARK position and the liftgate is in the OPEN position.
    • With the power liftgate chime still connected, press the rear power liftgate switch and measure the voltage between power liftgate chime C4186-1, circuit CPR56 (VT/BN), back probe and power liftgate chime C4186-2, circuit RPR56 (GY/VT), back probe.
    • Is any AC voltage present? 
    1. YES  : INSTALL a new power liftgate motor. TEST the system for normal operation.
    2. NO  : Go to  E2.
  2. E2 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Power Liftgate Chime C4186
    • Disconnect: LTM C4174B
      • Fig 2: Measuring Resistance Between LTM C4174B-9, Circuit CPR56 (VT/BN) & Power Liftgate Chime C4186-1
      GF0021163Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-9, circuit CPR56 (VT/BN), harness side and power liftgate chime C4186-1, circuit CPR56 (VT/BN), harness side; then between LTM C4174B-22, circuit RPR56 (GY/VT), harness side and power liftgate chime C4186-2, circuit RPR56 (GY/VT), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. E3 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO GROUND 
      Fig 3: Measuring Resistance Between Power Liftgate Chime C4186-1, Circuit CPR56 (VT/BN)
      GF0021164Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate chime C4186-1, circuit CPR56 (VT/BN), harness side and ground; then between power liftgate chime C4186-2, circuit RPR56 (GY/VT), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. E4 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO VOLTAGE 
      Fig 4: Measuring Voltage Between Power Liftgate Chime C4186-1, Circuit CPR56 (VT/BN)
      GF0021165Courtesy of FORD MOTOR CO.
    • Measure the voltage between power liftgate chime C4186-1, circuit CPR56 (VT/BN), harness side and ground; then between power liftgate chime C4186-2, circuit RPR56 (GY/VT), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  E5.
  5. E5 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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