Pinpoint Test F: The Door Lock Switches Operate Only One Way - Fusion/MILAN

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.

F1 RETRIEVE THE RECORDED SJB DTCs FROM THE SELF-TEST
- Check for recorded SJB DTCs from the self-test.
- Are any DTCs recorded?

Yes: For DTC B2A25, Go To PINPOINT TEST H .
For all other SJB DTCs, REFER to DTC TABLES .
No: GO to F2.

F2 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES
- Ignition OFF.
- Press the lock and unlock button of both door lock control switches while observing the door lock operation.
- Do the door locks operate only one way from both switches?

Yes: GO to F4.
No: GO to F3.

F3 CHECK THE LOCK INPUT OR UNLOCK INPUT CIRCUIT FOR AN OPEN (SINGLE SWITCH INOPERATIVE)
- Disconnect: Suspect Door Lock Control Switch.
- Unlock the doors from the working door lock control switch.
- Observe the door locks while connecting a fused jumper wire between the LH door lock control switch C505-1, circuit CPK19 (BU/GN), harness side and the LH door lock control switch C505-4, circuit GD126 (BK/WH), harness side; or between the RH door lock control switch C605-1, circuit CPK19 (BU/GN), harness side and the RH door lock control switch C605-4, circuit GD139 (BK/YE), harness side.
  
  Fig 1: Checking Lock Input Or Unlock Input Circuit For Open (Single Switch Inoperative)
  Courtesy of FORD MOTOR CO.
- Remove the jumper wire.
- Observe the door locks while connecting a fused jumper wire between the LH door lock control switch C505-3, circuit CPK23 (YE/VT), harness side and the LH door lock control switch C505-4, circuit GD126 (BK/WH), harness side; or between the RH door lock control switch C605-3, circuit CPK23 (YE/VT), harness side and the RH door lock control switch C605-4, circuit GD139 (BK/YE), harness side.
  
  Fig 2: Checking Lock Input Or Unlock Input Circuit For Open (Single Switch Inoperative)
  Courtesy of FORD MOTOR CO.
- Do the doors lock and unlock with the jumper wire?

Yes: INSTALL a new door lock control switch. REFER to Removal and Installation . TEST the system for normal operation.
No: REPAIR the input circuit in question. TEST the system for normal operation.

F4 CHECK THE LOCK INPUT OR THE UNLOCK INPUT CIRCUIT FOR AN OPEN (BOTH SWITCHES INOPERATIVE)
- Disconnect: LH Door Lock Control Switch C505.
- Disconnect: SJB C2280c.
- If the doors do not lock, measure the resistance between the SJB C2280c-17, circuit CPK19 (BU/GN), harness side and the LH door lock control switch C505-1, circuit CPK19 (BU/GN), harness side.
  
  Fig 3: Checking Lock Input Or Unlock Input Circuit For Open (Both Switches Inoperative)
  Courtesy of FORD MOTOR CO.
- If the doors do not unlock, measure the resistance between the SJB C2280c-4, circuit CPK23 (YE/VT), harness side and the LH door lock control switch C505-3, circuit CPK23 (YE/VT), harness side.
  
  Fig 4: Measuring Resistance Between SJB C2280c-4, Circuit CPK23 & LH Door Lock Control Switch C505-3, Circuit CPK23
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?

Yes: GO to F5.
No: REPAIR the circuit in question. TEST the system for normal operation.

F5 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.