.....Closed Circuit Seat Belt Description
When wired to a alarm buzzer or dash light indicator circuit the alarm will sound or the dash light will illuminate until the latch is connected in to the buckle.
In the operational state the micro safety switch is off which will allow the starting of the engine without the seat belt latch being connected in to the seat belt buckle.
If the latch is removed from the buckle when the engine is running the engine will not shut off. The alarm will sound or the dash light will illuminate indicating that the seat belt is not being worn.
Used in many newer vehicles to indicate that the seat belt is not being worn.
To have an alarm buzzer sound indicating that the seat belt is not being worn or has become disconnected.
To have a dash indicator light illuminated until the seat belt latch end is connected in to the seat belt buckle.
.....Open Circuit Seat Belt Description
When wired to the power source(hot wire between the ignition switch and coil) in order to start the engine the seat belt latch end must be connected in to the seat belt buckle to turn the micro safety switch on completing the circuit.
If the the engine is running and the seat belt latch end is removed from the seat belt buckle the circuit will be disconnected turning the micro safety switch off causing the engine to shut off.
The vehicle operator must connect the seat belt latch end in to the seat belt buckle end in order to start the engine.
The engine can not be started unless the seat belt is being worn.
If the operator disconnects the use of the seat belt the engine will stop.