Pinpoint Test A: All Door Locks Are Inoperative

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 .

A1 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES
- Press the lock and unlock button on both door lock control switches while observing the door lock operation.
- Are the door locks inoperative from both switches?
- Yes: For MKZ, multiple failures exist if all locks are inoperative. CHECK the symptom(s) and GO to SYMPTOM TABLE - ELECTRICAL .
  For Fusion and Milan, GO to A2.
- No: Go To PINPOINT TEST D .

A2 VERIFY ALL DOOR LOCKS ARE INOPERATIVE
- Press the lock and unlock buttons from a door lock control switch while observing the door locks.
- Are all the door locks inoperative from both switch positions (lock and unlock)?
- Yes: VERIFY the SJB fuse 17 (20A) is OK. If OK, GO to A3.
  If not OK, GO to A5.
- No: GO to SYMPTOM TABLE - ELECTRICAL .

A3 CHECK THE ALL LOCK CIRCUIT FOR AN OPEN
- Disconnect: LH Front Door Latch C525.
- Disconnect: SJB C228d.
- Measure the resistance between the SJB C2280d-6, circuit CPL11 (GY/BN), harness side and the LH front door latch C525-2, circuit CPL11 (GY/BN), harness side.
  
  Fig 1: Checking All Lock Circuit For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?

Yes: GO to A4.
No: REPAIR circuit CPL11 (GY/BN) for an open. TEST the system for normal operation.

A4 CHECK THE POWER DOOR LOCK RELAY GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the SJB C2280d-7, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 2: Measuring Resistance Between SJB C2280D-7, Circuit GD126 (BK/WH), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?

Yes: GO to A8.
No: REPAIR circuit GD126 (BK/WH) for an open. TEST the system for normal operation.

A5 CHECK THE LUGGAGE COMPARTMENT LID RELEASE OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Install a new SJB fuse 17 (20A).
- Operate the luggage compartment lid release by pressing the luggage compartment lid release switch.
- Is the SJB fuse 17 (20A) OK?

Yes: GO to A7.
No: GO to A6.

A6 CHECK THE LUGGAGE COMPARTMENT LID RELEASE SOLENOID
- Install a new SJB fuse 17 (20A).
- Disconnect: Luggage Compartment Lid Release Solenoid C429.
- Operate the luggage compartment lid release by pressing the luggage compartment lid release switch.
- Is the SJB fuse 17 (20A) OK?

Yes: INSTALL a new luggage compartment lid latch. REFER to Removal and Installation .
No: REPAIR circuit CPL59 (BN/BU) for a short to ground. TEST the system for normal operation.

A7 CHECK THE ALL LOCK CIRCUIT FOR A SHORT TO GROUND
- Operate the door lock actuators by pressing LOCK on the door lock control switch.
- Is the SJB fuse 17 (20A) OK?

Yes: REPAIR circuit CPL51 (BU/GN) or CPL52 (VT/GY) for a short to ground. TEST the system for normal operation.
No: REPAIR circuit CPL11 (GY/BN) for a short to ground. TEST the system for normal operation.

A8 CHECK FOR CORRECT SJB 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.