2000 Dodge Neon Air Bag Light

The Air Bag Light came on and stays on, also the horn quit working at the same time. I check the fuses and reset the computer by disconnecting the Positive cable for 30 min. I also replace the relay. What else or what do I need to do to fix this problem? The car has always had lights come on and stay on at different times for the past three years, always a fuse or a reset worked. The car runs perfectly other wise.