Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative

Handles, Locks, Latches and Entry Systems

Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative - Fusion

Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The SJB (Smart Junction Box) supplies voltage to the lock all relay, the unlock driver door relay or unlock all relay based upon input from the door lock control switches, the RKE (Remote Keyless Entry) transmitter, or the keyless entry keypad. Upon a lock request, the SJB (Smart Junction Box) supplies voltage on the all door lock circuit and ground on the driver and passenger door lock circuits. Upon an unlock request, the voltage and ground are reversed on the previously listed circuits. When the door lock and unlock relays are not energized they are connected to ground. A dedicated SJB (Smart Junction Box) ground circuit is provided only for the lock and unlock relays.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Door lock actuator (part of the door latch)

- SJB (Smart Junction Box)

PINPOINT TEST B : A SINGLE/MORE THAN ONE DOOR LOCK IS INOPERATIVE - FUSION

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

B1 CHECK THE OPERATION FROM THE INTERIOR DOOR HANDLE

- Open the door using the interior door handle.

Does the interior door handle operate normally?

Yes
GO to B2.

No
GO to Pinpoint Test U. Pinpoint Test U: A Door Is Difficult/Does Not Open From The Interior Door Handle

B2 CHECK THE LOCK LEVER OPERATION

- Operate the door lock lever while observing for any binding.

Is the door lock lever binding?

Yes
INSPECT the interior door handle and door latch for binding. REPAIR as necessary. TEST the system for normal operation.

No
GO to B3.

B3 CHECK THE ALL LOCK CIRCUIT FOR VOLTAGE

- Ignition OFF.

- Disconnect: Inoperative Door Lock Actuator.

- NOTE: The SJB (Smart Junction Box) only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
While pressing the door lock control switch in the LOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:

Inoperative Door Lock Actuator Connector-Pin Circuit LH front C525-2 CPL11 (GY/BN) RH front C603-2 CPL11 (GY/BN) LH rear C704-2 CPL11 (GY/BN) RH rear C804-2 CPL11 (GY/BN)





Is the voltage momentarily greater than 10 volts?

Yes
GO to B4.

No
REPAIR circuit CPL11 (GY/BN) for an open. TEST the system for normal operation.

B4 CHECK THE UNLOCK CIRCUITS FOR VOLTAGE

- NOTE: The SJB (Smart Junction Box) only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
While pressing the door lock control switch in the UNLOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:

Inoperative Door Lock Actuator Connector-Pin Circuit LH front C525-10 CPL51 (BU/GN) RH front C603-10 CPL52 (VT/GY) LH rear C704-10 CPL52 (VT/GY) RH rear C804-10 CPL52 (VT/GY)





Is the voltage momentarily greater than 10 volts?

Yes
INSTALL a new door latch for the door lock actuator in question. REFER to Front Door Latch or Rear Door Latch . TEST the system for normal operation.

No
GO to B5.

B5 CHECK THE UNLOCK CIRCUITS FOR AN OPEN

- Disconnect: SJB (Smart Junction Box) C2280D.

- Measure the resistance between the inoperative door lock actuator, harness side and the SJB (Smart Junction Box) , harness side as follows:

Inoperative Door Lock Actuator Connector-Pin SJB Connector-Pin Circuit LH front C525-10C2280D-28 CPL51 (BU/GN) RH front C603-10C2280D-27 CPL52 (VT/GY) LH rear C704-10C2280D-27 CPL52 (VT/GY) RH rear C804-10C2280D-27 CPL52 (VT/GY)





Is the resistance less than 5 ohms?

Yes
GO to B6.

No
REPAIR the circuit in question for an open. TEST the system for normal operation.

B6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.