Originally Posted by MrChad
?? The '03 remote in the key is the same as the fob remote fournd on the '02-98 Accords and '04 TSX key. It should work fine. Both keys use the on-off ignition button sequence.
If you transplant the transponder from the 02 into the 03 it will work. As far as i know the transponders are different and the keyless entry receiver will not accept it. There are about 30 different Honda remotes and none of them are interchangeable with each other that I've ever heard of.