While cleaning the Blazer I found a loose connector coming from the carpet directly besides the drivers side seatbelt buckle, behind the seat and between the seat and center console.
Wiring color is black with white stripes on both wires.
I couldn't find any corresponding connector to go with it. Any idea what I'm missing here ? Electric seats and heaters work, but airbag light comes on and stays on.

 

Seat belt buzzer, should be another end coming out of the buckle there. Pretty common for people to unplug them to make the buzzer quit working if you don't wear them.

 

That's what I first thought, but there's no connector coming out of the buckle. Seems that someone has changed the buckle somewhen and used a passenger side one.
The buzzer doesn't work either, neither for the belts nor for the headlights.