Hi, i have tried searching for this but have not found anything! I bought a second hand cd changer, the MC3198, to be installed into my 2000 CLK, when the stereo shop tested it they could hear the cds spinning and the power was working. but the audio 10 cassette head unit states there are no cds in the changer although the cartridge was full! anyone else had this problem? the person who i bought the changer off said it definately was working in their E-class. any help would definately be appreciated thanks in advance!