Air Bag Light On problems of the 2003 Hyundai XG350

Passenger airbag light goes off due to something getting touched under the seat. Many times when under warranty, they reset it. But it is no longer under warranty I called to Hyundai to see if this is a defect and to see if the light on means their is no airbag working and complain that if my kid put his foot under the passenger chair or if a book went under it, it shouldn't trigger the airbag to shut off but no one ever got back to me. I called up the dealer and found out that the light on does mean the airbag is off and they are not aware of a recall but this happens a lot. I think it is a defect . Why would make it so that anything can get under the seat to trigger wires to turn off important things. . I would hate to get in an accident and not have a passenger airbag. . . I am not sure when this first started and if st charles Hyundai kept track of each time they fixed it for me.