i jsut fitted the kit pictured to my car with "business CD". there is a small plug on the back of the radio that originally connects to the CD stacker and the AUX cable goes in there. If you still have a stacker, you have to remove and replace some wires, but all easy. If you have the screen, i expect you will have to take the 3 pins out of the connector and refit them. if you look on the BMW TIS site and get the wiring diagram for your head unit.
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