When various switch signals of the devices controlled by *SJB are transmitted to *BCM as CAN data, then BCM outputs the control signal to SJB. Having this signal, SJB controls *IPS and activates the corresponding device.

In addition, SJB performs PWM static voltage control (lamp control/lamp damage protection) through IPS and has a built-in auto cut relay that blocks parasitic current, a mode switch to cut standby power during prolonged parking.