the adapters that are available "trick" the deck into thinking a changer is connected... just wirring in some RCAs and trying to select the "aux" input wont work, the deck needs to "see" a changer there. There is something inside that adapter that works with the power and bus (control signal) to make the deck think it has a changer attached.

I saw your other post asking for the pin-out diagram... I have one for the earlier honda models (8-pin DIN plug), i'll find it for you if you need that one, or if you have a newer honda (usually 98-up, depending on the car) the pin-out is right on the radio... all the connections for power & speaker connections for the radio, as well as the changer connector are listed right on a sticker on the unit. If for some reason, you have a newer honda and there is no pin-out listed on the radio, I can get a pic of it for you so you can use that for your experimentation.