The only other changer that will work with the COMAND over the fiber optic loop is the Becker Silverstone 2662. It cannot play mp3's. The changer is supposed to go in the glovebox on CL203's. Ameican cars have the power wires for the changer coiled behind to dash, and the fiber cable is reported to be in the area under the cargo compartment floor ahead of the spare tire well. The fiber cable is removed from that location and used to connect the COMAND to the changer in the glovebox.
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