*SJB sends signals from various switches to *BCM. And receives output control signals from BCM to control relays and *IPS.

Also, SJB performs PWM constant voltage control(to control headlamp/protect headlamp) through IPS.

Dark current auto cut off device to cut dark current and Switch that cuts off all time power when vehicle is parked for long period time is embedded.

*BCM is responsible for monitoring and controlling electronic accessories in a vehicle's body. It controls output of time or alram related function with switch signals from switch and switch signals from *SJB via B_CAN communication.

SJB uses B_CAN(Body CAN) for optimizing wires and communicates with other units to receive required data and transmit data to other units.