I have a '98 which only has a light, no bell. I see your point as I've driven shivering a few blocks before putting it on the few days that I don't walk out and start it up 15 mins. before launch time. Might be the same chime that warns about your key in the ignition before lockin'em in tho if you disable it by cutting the wire. (who actually listens to that?) Just a guess. If you have a good ear I'd think that you can find the source. If not you can always go to the local junkyard & slice off a male slab to shove into the receiver & it'll think you're smart.
THE MAN has decided that you put on your seat belt, you will comply!
Near my house I've seen 8 cops at major intersections walking lanes writing tickets for no belts. Also see cops frequently with binoculars looking for shoulder straps. I think the fine is $75. Click-It-or-Ticket. lol. It might raise your insurance if you get caught, & all of our's if you F-yourself up & our insurance co. has to pay for it...
I know this isn't what you're for but you might want to think about just putting it on.
Glad I could help...
