I put the key in the ignition and cycle it on, off, on, off, .............pretty fast until the door locks go up and down............keeping the key on you hit the 1/2 button on the keypad and then enter your factory keyless entry code and then hit 1/2 and also have your remotes with you while doing this and hit any button on the remote or remotes and then hit the 1/2 button again and you should be set!!
My keyless entry quit working I guess when I originally programmed a second remote to it.
Good Luck!! Let me know if this worked.