I bought a used Honda Accord recently and its remote wont work in terms of unlocking/locking the doors. This was pretty irritating. So, i did two things. I took it to mechanic and got the door locks checked for being hard and got them oiled (well, only the rare left had a problem). Second thing, while searching on the internet for the problem, I found a link for remote programming. Its available at:
It was pretty easy to program and works fine now. Hope it helps someone.