i have a 1991 300 se and I finally got the radio code and the radio now works. i am however a little confused with how the ch changer works. I predd the mode button and it says CC which i know means Compact Cassette. When i press it again it goes back to FM radio. a couple times i have gotten it to say load and a number, i can hear it shuffling the cds, it will say load 1, load 2, up to load 6 then it will switch back to fm radio. Does anyone know if it sounds like its broken or maybe im pressing the wrong button.. maybe there is a special trick to this unit. Again i have a 1991 300 SE with becker silverstone 10 disc cd changer in the trunk. It is the stock unit.