Visiting from E34 forum. I got Becker Traffic Pro 4769 BMW version which I have in my E34
I want to connect USB/MP3/BT to this radio but can't find any adapters. For example:
https://www.ebay.com/itm/201814287783?ul_noapp=true

Adapter seem to work with Becker Traffic Pro. I got it and it doesn't work. After studying more, seems like my version of becker is NOT regular one. Seems like BMW specific one got i-Bus and it's ready to work with BMW CD Changer. So, protocols differ.
Why posting on E46 forum? Because I found this:
http://www.waycoolinc.com/z3/01/0815...6_3_SERIES.pdf

So, it seems that E46 had this radio as retrofit option. And instruction shows cable harness which will connect CD Changer to radio.

Questions:
1. Does anybody have details on CD Changer connector and pinout?
2. What aftermarket adapter would work for BT/MP3/USB? Looks like any adapter which works via E46 harness will work for me, I just need to re-wire it a little.

Thanks!