just bought a 2013 mercedes s550. the screen shows no cd cartridge. i can't find where to insert the cd cartridge. i assume it is in the trunk, but cannot find it. car is definitely set up for one. anyone have a clue. i checked the left side of the interior trunk and can't find it. also can't get the radio to work. any help on how to do that. car is new to me and everything else works. need some advice.
thank you.

I had a 2013 C300, all 6 discs loaded inside the radio. Check page 225 of this 2013 S Class manual....

https://www.google.com/url?sa=t&sour...9J1bAaTbRkuqdr

2013 is W221, not W220

Open the glovebox, and push the small button at the top.