I have searched until I couldn't stand it any longer. There is so much info, much of it conflicting, so I'm asking here.
My 01/1995 525i has an Alpine5 head unit (verified via prog/minus keys) and I recently bought a BMW CD changer A, model number TR1003, part number 82 11 1 468 014. The connectors were an exact match for the ones in my car and the head unit recognizes the CD changer. The changer finds the CDs in the magazine and tries to play them, but all I ever get is a "Disc Error" message. It even sees which slots in the magazine I've loaded CDs into, but no matter what, it will not play. It definitely loads the cd into the player without jamming.
At first, I was positive that it was simply a matter of the changer itself being bad (purchased used), but now I'm thinking it's a compatibility issue.
Anyone have experience with this setup??