Pinpoint Test B: A Single Door Lock is Inoperative

Handles, Locks, Latches and Entry Systems

Pinpoint Test B: A Single Door Lock is Inoperative

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

Normal Operation

The Smart Junction Box (SJB) 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 or the Remote Keyless Entry (RKE) transmitter. 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 latch

- SJB (Smart Junction Box)

PINPOINT TEST B : A SINGLE DOOR LOCK IS INOPERATIVE

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 DOOR LATCH FOR BINDING

- Lock and unlock the inoperative door lock using the door lock rod.

Does the door lock and unlock?

Yes
GO to B3.

No
GO to B2.

B2 CHECK THE LOCK ROD FOR BINDING

- Operate the door lock rod manually while observing the door lock rod for any binding or if the rod is bent.

Is the door lock rod bent or binding?

Yes
REPAIR as necessary. TEST the system for normal operation.

No
INSTALL a new door latch. REFER to Door Latch . TEST the system for normal operation.

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 Driver C501-4 CPL11 (GY/BN) Passenger C603-4 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 Driver C501-3 CPL51 (BU/GN) Passenger C603-3 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 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 SJB (Smart Junction Box) , harness side, and the inoperative door lock actuator harness side as follows:

SJB (Smart Junction Box) Connector-Pin Circuit Inoperative Door Lock Actuator Connector-Pin C2280D-28 CPL51 (BU/GN) Driver C501-3C2280D-27 CPL52 (VT/GY) Passenger C603-3






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.