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Pinpoint Test E: The Power Liftgate Chime Is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. 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.
      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.
      • Fig 1: Measuring Voltage
      GF0021162Courtesy of FORD MOTOR CO.
    • Is AC voltage present? 
    1. YES  : INSTALL a new power liftgate motor. REFER to Power Liftgate Motor . CLEAR the DTCs. REPEAT the LTM self-test.
    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 C4174A
    • Measure the resistance between LTM C4174A, harness side and power liftgate chime C4186, harness side using the following chart:
      LTM Circuit Power Liftgate Chime
      C4174A-9 CPR56 (VT/BN) C4186-1
      C4174A-22 RPR56 (GY/VT) C4186-2
      • Fig 2: Measuring Resistance
      GF0043683Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  3. E3 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO GROUND 
    • 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.
      • Fig 3: Measuring Resistance
      GF0021164Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  4. E4 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO VOLTAGE 
    • 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.
      • Fig 4: Measuring Voltage
      GF0021165Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
    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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