PT Cruiser passenger airbag light and bell go off without reason

Check in your owners manual. Procedure for shutting the bell off is in there. Don't have my manual closeby  so I can't look at it.

HI I may have found y the airbag light goes off and on on pt cruisers. there is a pair of wires that connect to the seat air bag pod, the wires run down the seat and to a connector in th floor. after long in vestigation i found that even thou the wires have a conduit protecting them the wires run under the foam pad and over a steel bar, which caused 1 wire to be cut inside yet there was no tell tale sign from out side the sleeve, it was only when I disconected the battery and then the connector from the airbag and the floor connector removed it and run a meter on the two I found it. when i "pulled" the leads the outer sleeve stretched exposing the fault, the wire had a very clean break in it which was odd but the fault. note that only one wire powers the air bag, the other is a feed to the PCM, hence they are connected at the ends hence not easy to trace and with saftey in mind you must not put meters on the wires while connected to any part of the airbag

This is could be the same issue I have with the belt buckle sensor being loose and not receiving enough pressure (passenger side). Depending on how badly it's malfunctioning, the airbag light and chime may go on only when it's buckled, or go on and off whether buckled or not.
The dealership told my the *good* news that I had to pay for it myself ($60 for the diagnostic $200+ for the new sensor), since the nice loophole in the warranty makes sure it doesn't get covered.
My wife discovered if she applies pressure bye 'bending' the buckle inward towards her, it turns off permanently.
Since I can't justify tossing out $260 right now for a shoddy job the manufacturer should have covered, I rammed a large paperclip in instead until I figure out the safe way to get around this. Had to fiddle with it for a bit, but it stays of now.