Pinpoint Test E: All Door Locks Are Inoperative From One Switch - MKZ

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY DISCONNECT .

E1 CHECK THE RECORDED SJB AND DDM DTCs FROM THE SELF-TEST
- Check the recorded results from the SJB and DDM self-test.
- Are any DTCs present?

Yes: REFER to DTC TABLES .
No: GO to E2.

E2 CHECK THE DRIVER DOOR LOCK CONTROL SWITCH
- Check to see if the driver door lock control switch is the inoperative switch.
- Is the driver door lock control switch inoperative?

Yes: GO to E3.
No: GO to E4.

E3 CHECK THE DRIVER DOOR SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Disconnect: Driver Door Lock Control Switch C505.
- Measure the resistance between the driver door lock control switch C505-4, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 1: Measuring Resistance Between Driver Door Lock Control Switch C505-4, Circuit GD126 (BK/WH), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?

Yes: GO to E5.
No: REPAIR circuit GD126 (BK/WH) for an open. TEST the system for normal operation.

E4 CHECK THE PASSENGER SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Disconnect: Passenger Door Lock Control Switch C605.
- Measure the resistance between the passenger door lock control switch C605-4, circuit GD139 (BK/YE), harness side and ground.
  
  Fig 2: Measuring Resistance Between Passenger Door Lock Control Switch C605-4, Circuit GD139 (BK/YE), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?

Yes: GO to E5.
No: REPAIR circuit GD139 (BK/YE) for an open. TEST the system for normal operation.

E5 CHECK THE SUSPECT DOOR LOCK CONTROL SWITCH FOR CORRECT OPERATION
- Carry out the door lock control switch component test.
  Refer to COMPONENT TESTING - EXCEPT HYBRID and/or COMPONENT TESTING - HYBRID for component testing.
- Is the door lock control switch OK?

Yes: For an inoperative driver door lock control switch, GO to E6.
For an inoperative passenger door lock control switch, GO to E7.
No: INSTALL a new door lock control switch. REFER to Removal and Installation . TEST the system for normal operation.

E6 CHECK THE DDM FOR CORRECT OPERATION
- Disconnect all the DDM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes: INSTALL a new DDM . REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.
No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

E7 CHECK THE SJB FOR CORRECT OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes: INSTALL a new SJB . REFER to INSTALLATION . TEST the system for normal operation.
No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.