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Yes, you're going to have to do some reconfiguring of the fiber optics system, then it MAY work OK for awhile, but ultimately you are going to want to get the internal configuration of the COMAND system changed. More on that after I discuss the reconfiguration of the fiber optics lines:
Yes, the "flow" should be "COMAND/AMP/CD changer". If you look again at the fiber optics cable (I assume you have the trunk trim removed already) you will see a small black connector on the fiber optics cabling (the two that are running to the amp), it has a metal tab on each side. You need to open up one or the other of those tabs so you can insert that taped-on loop into it. You want to look at the half of the existing fiber optics cable that is presently running forward to the front of the car (going to the COMAND unit) and note what the color is of the tip, it's either clear or red. Insert the end of the part that was taped down which is the OPPOSITE color (red goes towards the clear or vise-versa ALWAYS on this system). Take the other end and connect the other two together, then plug the fiber optics connector to the CD changer. When reinstalling the CD changer, make sure that you dont excessively bend the fiber optics cable or pinch it between anything, you can damage the cable, then you're in deep doo-doo, as in "cha-ching, hello Mr Dealer, what's my credit limit?", so be careful.
On the other part of the job (as if this weren't enough), which is changing the internal coding of the COMAND system:
The best bet is to have the dealer do it, they are supposed to be doing it using the SDS (Star Diagnosis System) computer, should cost too much, should only take 10 minutes or so, just a little computer work is ALL it is at that point (once the optic system is happy). If you don't have this done, it MAY work fine, but the system can also "lock up" so to speak, which won't damage anything, usually just shutting off the car and starting it up will restore it to working condition. It can be very hit-or-miss, may work fine for a year, or may not want to work reliably at all, hard to tell. You can do the first bunch of work and give it a try. There MAY be a work-around with the COMAND system on doing that last part, I'd have to check my notes. Just go with what I told you for now and get back to me.
Gilly
PS Just noticed the last questions. NO you won't need to remove what you called the "radio", this being a 220 chassis S Class, I assume you meant "COMAND" not "radio". You have the big screen right, with the nav system? That's what all US spec S Class cars have.
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