E60 Nokia CK-7W anyone tried fitting one

Hi I have just bought a Nokia CK-7W bluetooth car kit and it basically looks as though it is 4 wires to fit it.I have scoured the net looking for a
wiring diagram of the audio/ignition system on my E60 with no joy.I wonder if anyone as fitted one of these or can point me to where I might get this information from.
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