Test C: A Single Door Lock Is Inoperative

PINPOINT TEST C: A SINGLE DOOR LOCK IS INOPERATIVE

C1:

C1-C2:

C2-C3:

C3-C4:

Normal Operation
The smart junction box (SJB) receives voltage on circuit SBB01 (RD). When the SJB receives a lock signal from a door lock control switch, or a remote keyless entry (RKE) transmitter, the SJB closes the lock relay control circuit. The lock relay closes, supplying voltage to the door lock actuators on circuits CPL11 (GY/BN) and CPL19 (WH/VT) and ground on circuits CPL51 (BU/GN) and CPL18 (GY/VT), locking the doors.

When the SJB receives an unlock signal from a door lock control switch, the SJB closes the driver door unlock relay and the door unlock relay control circuits. The driver door unlock relay closes, supplying voltage to the driver door lock actuator on circuit CPL51 (BU/GN) and ground on circuit CPL11 (GY/BN); and the door unlock relay closes, supplying voltage to the passenger door lock actuator on circuit CPL18 (GY/VT) and ground on circuit CPL19 (WH/VT), unlocking the doors.

When the SJB receives an unlock signal from an RKE transmitter, the SJB closes the driver door unlock relay control circuit, supplying voltage to the driver door lock actuator on circuit CPL51 (BU/GN) and ground on circuit CPL11 (GY/BN), unlocking the driver door; a second unlock signal from the RKE transmitter closes the door unlock relay control circuit, supplying voltage to the passenger door lock actuator on circuit CPL18 (GY/VT) and ground on circuit CPL19 (WH/VT), unlocking the passenger door.

Possible Causes
- Circuit CPL11 (GY/BN) open or short to ground
- Circuit CPL18 (GY/VT) open or short to ground
- Circuit CPL19 (WH/VT) open or short to ground
- Circuit CPL51 (BU/GN) open or short to ground
- Door lock actuator
- SJB