Just a friendly reminder. If your key fob is more than a year old, replace that battery tomorrow.
It takes a #2032, and replace both fobs. They go bad with very little or no warning and always at the worse time.
The batteries I replace usually have some life left in them. I put the old batteries in the package I just took the new batteries out of, tape it shut and put it in the trunk. I've given two of the reserves out to people on the road who became stranded, one on a poker run and one in Deadwood, SD.
I know there's an override code, but few people know how to activate it or even remember their security code number. It's easier to just replace the battery.