On Thursday, February 4, 2016 at 7:30:08 PM UTC-7, Bill Vanek wrote:
> I don't know how that system works, but in general, a battery that
> stays dead for an extended period can let a device lose its memory,
> and sometimes things just happen. I think that if either the fob or
> the module had its memory erased or corrupted, you would have to
> reprogram. If the method in that link works, it's a cheap fix. Even
> new fobs appear to be pretty cheap, and worth a try.

Interesting. It's possible that you can pair a fob with the car without going to the dealer, if the method in that Yahoo answer works (and does not fry my PATS module or some such). I definitely had to go to the dealer to get a new key paired with the vehicle.