Originally Posted by joey t
I have a 2003 civic with the same thing. I was told to keep the door lock and alarm intack i had to buy a speciale harness and they would drop the old cd player behind the dash and still keep the other stuff working. The harness for my car is almost $100
Yup, from what I understand (at least on teh 6th gens) you need a Y adapter harness and need to keep your OEM headunit.
Acutally I remember someone saying that the power for the remote entry is pulled from another location on OBD2B civics (99-00) and thusly, you don't need a Y harness. So, that is woth investigaing, but It's unconfirmed.
-PHiZ