Seat Belt Starter Interlock Systems: Operation: Notes

Interlock logic module is always connected to battery power. When a seat sensor is actuated, module senses this and sends power to interlock relay coil opening the normally closed contacts. This opens circuit to starter solenoid preventing engine start. When seat belts are fastened, the module senses a circuit change and power to interlock relay is stopped and contacts close permitting engine start. Logic module prevents interlock relay from closing if buckle is activated before seat sensor.