Helpermunk

I recently purchased a used 2011 IS250C. It came with what I believe to be the original two remotes. One of the remotes will open the trunk using the trunk button on the remote, you hear the beep and you hear the latch release and the trunk pops up a small fraction. When you push the trunk button on the other remote, noting happens at all, no beep, no latch noise, not popping up. I put a brand new battery in the remote that is not opening the trunk and it made no discernible difference. The remote that does not open the trunk, seems to work perfectly normal in every other way, locks and unlocks the doors and also memorizes driver position for seat and mirrors.

I have searched through these posts and there are a lot about trunks and remotes but I have not found one that talks about one remote opening the trunk and one remote not opening the trunk.

Any thoughts out there about what might be wrong with the one remote and how I might fix it?

Any ideas would be appreciated.