Your sensors. You will have two sensors in total for the switch. Two females in the car, two males on the seat, for each seat.
One is the seatbelt sensor to know whether or not your seatbelt is connected.
The other is one I'm not totally sure of. However, this is what I know. It is the weight sensor on the passenger side to let the car know whether or not to deploy the airbag in the event of an emergency. If the weight is under "x" amount (I can't remember what the manual says, refer to it to get an exact number).. you'll see the light on your dash that says "OFF". This is to ensure that if you had a baby seat in the front, the airbag would not go off and potentially kill the baby.
This sensor is the infamous sensor that everyone says you need a resistor for. I've tried 2ohms, 2.5ohms and 3ohms, all of which have failed. However, I'm not electrical saavy, I may have been doing it wrong, but it didn't turn the light off for me. If you have a voltmeter, you can check exactly what ohms you need.
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