SOURCE: belt routing diagram for a 2005 E320 mercedes benz
Hello I'm a M.B. tech. As long as it is original there is no amplifier other than the head unit itself. The only tricky part is getting the antenna to work with the new head unit. Take a test light and find which wire is hot all the time. That will be your circuit 30 wire(radio memmory). Next turn key to position 2 and find your wire( one is for the antenna and the other is for your radio operation) and isolate those 2 wires,. Find your ground wire and those are your basic connections. There is a fader switch in your center console wood. the head unit sends its power ther and it is dispursed to the appropiate speakers(it is also a common problrm when you have no sound. Try to pop the switch up carefully with a flat blade screwdriver. If not pop up the shifter trim ring and pull up on the console wood. You may have to remove the ashtray. It is a fairly simple install hopefully my advice has been helpful.
SOURCE: need a diagram for serpentine belt replacement for mercedes benz
Below is a link for your diagram. Best of luck!
Greg
http://www.mvreader.com/multiview/dayco/zoom.php?zoom_item=C0002R&l=n&catalog=auto&category=2
SOURCE: 2001 Mercedes-Benz S430 serpentine belt diagram
Check the underside of your hood for a belt diagram. If it's not there, call your dealer with your VIN number to get the correct diagram.
SOURCE: need a diagram to replace fan belt for mercedes
Hello there sorry it took a while but here it is
Belt Routing Diagram 
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