Front Air Bag Sensor Control problems of the 2009 Hyundai Accent

Around 75,000 miles, vehicle is 4 years old, airbag sensor went off (no accident or anything). I brought the car to the dealership to have it looked at. Came back estimating roughly $1,200 repair to replace the passenger side seat. I told them it is probably just a blown fuse and to check for that, they refused and said they've seen the problem before and that the repair is not covered under any warranty and that it was likely my fault due to a spilled drink. I've never spilled a drink in this car or even left the windows open. Therefore, the problem is most likely due to faulty wiring. I refused to pay the $1,200 repair. Now I am writing this because I am likely to fail inspection and will be forced to repair it. I want to increase visibility of this issue.