Air Bag Light On problems of the 2007 Chevrolet Express

The air bag light in the instrument panel is constantly on. The passenger air bag status light is constantly reporting no passenger, even with an adult passenger seated. I have paid $100 for diagnostics by the dealership. They say that none of the air bags will deploy in case of a collision. The dealership says this defect is not under gm warranty and estimates the repair at $1000. This car never had any collision. It even does not have any dent. Did you get other complaints? is this acceptable?.