I have a stock CD changer in the trunk of my 1989 750 and it is missing the magazine (holds the six cds). Thanks to this group I have identified it as a Pioneer unit but the Pioneer magazine I tried did not work properly. I could load it in the changer and it would start to index disks (seemed to check each slot of the magazine). but after completing this indexing the head unit displays an err message.
My question is can I use this Pioneer magazine, do I need a special BMW magazine, or is the changer broken?