I got a 93 300D with a mercedes-benz tape deck and an alpine 6 cd changer in the trunk it have a wired controller on the mid console
tried to reset the changer by unpluging it for a couple of minutes and pluging it back
Here is what it does :
With radio to any station if I turn the cd unit on the radio voice goes away the unit powers up I can here the cd changer moving and cd's being loaded it actualy reads cd -01 -02 etc on the display unit
the radio displays CC-------------E if I hit the mode button to switch over to cd changer
the wire display for the changer looks like its working if I hit play it would display the play icon skips to next song and next cd if I wanted to as well

is it confusing or what ? haha
and the antenna does not go up or down on its own i would have to get out at the carwash to push it and then pull it back up, dont hear the motor going on at all so i am thinking thats shot