Pinpoint Test K: The Power Liftgate Chime Is Inoperative

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

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.

K1 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Liftgate/Trunk Module (LTM) C4174B .
- Disconnect: Power Liftgate Chime C4186 .
- Ignition ON.
- Measure the voltage between:
  - power liftgate chime C4186-2 , circuit CPR56 (VT/BN), harness side and ground.
  - power liftgate chime C4186-1 , circuit RPR56 (GY/VT), harness side and ground.
    
    Fig 1: Checking Power Liftgate Chime Circuits For Short To Voltage
    Courtesy of FORD MOTOR CO.
Is any voltage present?
- Yes : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the LTM self-test.
- No : GO to K2.
K2 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
  - power liftgate chime C4186-1 , circuit CPR56 (VT/BN), harness side and ground.
  - power liftgate chime C4186-2 , circuit RPR56 (GY/VT), harness side and ground.
    
    Fig 2: Checking Power Liftgate Chime Circuits For Short To Ground
    Courtesy of FORD MOTOR CO.
Are the resistances greater than 10, 000 ohms?
- Yes : GO to K3.
- No : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the LTM self-test.

K3 CHECK THE POWER LIFTGATE CHIME CIRCUITS FOR AN OPEN

Measure the resistance between LTM C4174B , harness side and power liftgate chime C4186 , harness side using the following chart:

LTM Connector-Pin	Circuit	Power Liftgate Chime Connector-Pin
C4174B-9	RPR56 (GY/VT)	C4186-1
C4174B-22	CPR56 (VT/BN)	C4186-2

Fig 3: Measuring Resistance Between LTM C4174B And Power Liftgate Chime C4186, Harness Side

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : GO to K4.
No : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.

K4 CHECK FOR CORRECT LTM OPERATION
- Disconnect all the LTM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the LTM connectors and make sure they are seated correctly.
- Make sure the liftgate is fully closed.
- Connect all previously disconnected connectors and make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new LTM . REFER to LIFTGATE/TRUNK MODULE (LTM) .
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.