Re: Seat belt light on dash
When ignition is switched on, the seatbelt light comes on as a test, independent on the seatbelt status. Thereafter it depends on the hall effect switch which sits embedded in the buckle. I would check the wiring from this switch as far as possible. I believe it runs together with the power seat wiring. The wires will go to the airbag control module, which sits under the center console, just behind the shifter assy.
Regarding a chime, did it do that before? I have no chime on my jeep at least for the seatbelt, but that can be market dependent.