2003 Impala Air Bag light turn off

On my 2003 Chevy Impala my airbag light will not go off. I was in an accident about 2 years ago, but this issue started last year. I had it brought in to an Auto Electric shop that replaced the clock spring. It is still coming on. I am not sure how the air bag system works and what parts I could look for. A little additional information. When it is 50 or below and I hit a rather large bump/pothole the light will go off until I hit another large bump/pothole. When it is above 50 degrees it just remains on. Every once in a while it will go off for a few minutes and then it will come back on. Any information or assistance is much appreciated.