Date registered: Oct 2004
Vehicle: 2013 S550
Location: Tampa, Florida
Mentioned: 14 Post(s)
Quoted: 271 Post(s)
You don't need me to answer the first two, but here goes.
1) You'll only know if you try. Look at the links I gave you and decide for yourself.
2) There are several fuses in your audio system. You could try #6, but I cannot say it will bring it back. However, it won't hurt anything to try.
3) A problem with the CDC may very well be the source of your problem. I have given you a link that addresses troubleshooting, and with what you described, the CDC would be high on my list of early things to try.
2005 S500 4-Matic