Pinpoint Test F: The Door Lock Switches Operate Only One Way

Handles, Locks, Latches and Entry Systems

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

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) sends voltage signals to the door lock control switches through the lock and unlock input circuits. When the lock or unlock switch is pressed, the corresponding voltage signal is routed to ground, signalling the SJB (Smart Junction Box) to lock or unlock the doors. The door lock control switches have a dedicated ground circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Door lock control switch

- SJB (Smart Junction Box)

PINPOINT TEST F : THE DOOR LOCK SWITCHES OPERATE ONLY ONE WAY - FUSION

NOTICE: 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 (Smart Junction Box) DTCs FROM THE SELF-TEST

- Check for recorded SJB (Smart Junction Box) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC B2A25, GO to Pinpoint Test H. Pinpoint Test H: DTC B2A25, B2574, Or B2575

For all other SJB (Smart Junction Box) DTCs, REFER to DTC Charts. Doors, Hood and Trunk

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.





- 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.





Do the doors lock and unlock with the jumper wire?

Yes
INSTALL a new door lock control switch. REFER to Door Lock Control Switch . 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 (Smart Junction Box) C2280C.

- If the doors do not lock, measure the resistance between the SJB (Smart Junction Box) C2280C-17, circuit CPK19 (BU/GN), harness side and the LH door lock control switch C505-1, circuit CPK19 (BU/GN), harness side.





- If the doors do not unlock, measure the resistance between the SJB (Smart Junction Box) C2280C-4, circuit CPK23 (YE/VT), harness side and the LH door lock control switch C505-3, circuit CPK23 (YE/VT), harness side.





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 (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.