Date registered: Nov 2009
Vehicle: 2001 S55 AMG
Location: Westchester New York
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I did this on my 2001 S class. You can buy one of those Satellite radio units, that come with the display and antenna.
Then, just put the antenna somewhere in the dash, run the wires and hide them. The way to power the Satellite radio is like this:
The easy way is to get a tape adapter, and put it in your Mercedes tape player in the command and connect it to the satellite radio unit. The second way is also an FM transmitter, but you may need someone who specializes in car audio to install it inside and run the wires.
Otherwise, no way to really integrate it into the command without change the command system itself in these older w220. The newer ones had satellite radio as an option, but not the older ones.