i posted this thread
https://honda-tech.com/zerothread?id=941545
but i also need to know what this box does in these adapters.. are there resistors or something inside.. a brain of somesort?.
cause i found the wire diagram for the old style cd changer adapter. and i have the diagram for my newer style plug. so im wondering if i can just wire it up.. or if that box does something.

http://www.logjamelectronics.com/piehonpcalp.html