Yes I would believe you joined for the thread.

I use this interface and it works OK except for the empeg getting confused when characters echo back to it while booting.



Yes I can read/write Ibus no problems and currently have the 1 - 6 direct CD access buttons controlling my empeg remotely with great success (apart from the delay due to drives spinning up). Ibus is quite simple to program. I wrote my code completely from scratch in just a few hours, plus another few hours debugging some stuff where the head unit didn't like exactly what I was sending.

On mine, I am using the CD changer Ibus interface and have disconnected the changer for now. I might try and do some sort of pass through so I can have both empeg and CD changer but now the changer lies dormant. On mine the red wire is +12, black is ground and yellow is Ibus from memory.

The CD changer with Ibus appeared on later E36s. I don't know when but would guess around 96-97.