I bought a 03 mustang, and the first thing i do with new vehicles (to me) is deep clean them, so i took out the seats, and i noticed the passenger side didn't have any plug going to it. There was no plug on the seat, or sticking out of the carpet. Furthermore, the seat belt alarm goes off all the time. Any solutions? Links to fixing this? Id rather get the sensor installed again then hack it to disable the alarm, but i suppose ill do what I have to do. Thanks.

 

It's come to my attention that the passenger side doesn't have a sensor. Why, then, does the alarm go off even when I wear my seat belt?