****WARNING* - I KNOW LITTLE ABOUT CARS ****

Hey guys, -I have a 2006 Grand Jeep Cherokee Laredo, and a few weeks ago the airbag light showed up on dash. I reset the battery and checked fuses and it will come back on when I power the vechical up. I went to auto zone to try and check codes, but nothing came back. However just recently my wife and I realized that when she doesn't buckle up, the annoying *ding* *ding* doesn't happen any more. Its almost like the seat is not recognize she is there, or buckling it in. I tried to put more weight in the seat (ie.. me) and nothing. I contacted the dealer and told them say thing, and they said its going to be a $115 fee to just check the car out. Does anybody have experience with this, or have some ideas. We are a bit strapped for cash right now, but I would hate to skimp out on safety to save a few bucks.

Thanks,