Right - I hope I'm not being stupid here....

Just got my Ice Link Plus......and have a 2005 X5 - they've given me the Quadlock connection - but I can't work out where I connect the CD connectors into anywhere. I can't find instructions anywhere for this installation....I'm normally ok at these things.

I understand the radio is in the back, but can't for the life of me figure this out..........

Any help appreciated..