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Try programming the key fob.
1). Sit in the vehicle with doors closed.
2). Put the key in ignition switch. Turn it to ON
3) within 15 seconds press lock on the fob
4). Turn switch back iff
5). Turn switch on and within 15 seconds press lock on the fob.
6). Turn switch back off
7). Turn switch on and press lock. You should hear the locks cycle. Quickly press unlock.
8). Take the key out of the switch and check the key fob again.
See if that gets that key fob working. Keep in mind that if the fob does start working again you'll need to program the other fob along with the current fob once you get your hands on it. It sounds like the battery may be bad in your fob, but the light may be just burned out on it. You can go ahead and rate me positively. Don't worry, there aren't additional charges for asking questions after you rate so we can keep chatting. Thanks