Unfortunately this upgrade is not a plug and play like so many bmw type upgrades ….. an adapter plug is required. So the first thing was to get hold of the plug attached to the original type mgzt / R75 cd changer and the bmw plugs that plug into the mp3 player so I could make the adapter cable. See …… https://mgzt.info/2022/03/21/bmw-mp3-changer-installation-instructions-bimmernav-online-store/
I need to identify each of the wires and join these 2 cables together ….. so some research on the internet to get the pinouts for each cable and just as important to identify which cd/mp3 changer to find. See …… https://mgzt.info/2022/04/09/which-cd-changer-plays-mp3s-bimmernav-online-store/
To be continued …….