I recently lost operation on one of the keyless entry remotes to my 2000 Impala. I was cranking my engine when I lost the entire electrical system. Turned out to be a bad connection at the battery. I tightened the bolts and it started fine, but my fob no longer works. The other one works fine. Do I really have to take the car to the dealer for reprogramming, or is this something I can do myself. Thanks!