I have a 98lx and have a chance to buy a 01 integra cd player/radio. Will my keyless work, or will I have to keep my old radio under the dash>

 

You're going to have to keep the stock radio behind the dash. For some reason in the 96-98 civic's honda ran the keyless entry and I'm almost positive the interior light is also connected to the radio too. Stupid design if you ask me.