Quote: Originally Posted by
upspace 
thx jonessc.
i don't have a cd charger in the trunk but business cd radio (hifi system) with amplifier on left side in trunk.
many wires here. the only one that is not documented is a white cable. i assume this is the i bus. since it is serial i only need one cable right?
there is no pre-wired cd changer i-bus wire in the trunk for european built e46 year 2003/4 model which have a business cd radio / hifi system (10 loudspeakers).
i have i bus in the head unit on old round pin 7 which i extended to trunk via
a) separate wire or
b) used an unused head unit to amplifier wire since i completely replaced the stock amplifier with 2 channel amplifier (therefore don't need seperate wires from hu to amplifier for rear and front channels)
now i bus interfaces works.