CD Changer cable schematics help
 

Hi to all group,
I'v buyed on ebay a original BMW CD Changer and I want to connect it to my navi system. I want to build myself the cable, so I need help to understand wich pins I've to connect between CD Charger and BM54 radio. I want to build a direct cable, don't want to use standard BMW CD changer cable to send from the thunk to the head and then return from the head to the CD changer in the thunk.

CD Changer has 2 connectors, one with 6 pins (but only 3 are connected I mean: R+ L+ and common GND audio signals) and a second with 3 pins (+12V, GND, I-Bus). Wich pins must I connect on BM54 radio side?

Someone has any schematics?

Thanks