My 05 SL55 with 93% of the parts on the car new, LoL just an inaccurate figure, but... the CD player works when playing CDs that are in the changer behind the driver seat. I got a Navigation disc, but the disc currently in the in-dash CD holder won't eject and it will not accept a new disc inserted, presumably because there's already one in there. When selecting "Navi" it says "No Disc". I usually (never) use navigation, since I most often know where I'm going, or pretend to. But it would be nice to have the Nav "work". I also have my cellphone and its GPS for if I'm ever out of town so this isn't a big deal. 99% of the time I leave Location Off, but Big Brother can still tell where you are, when and for how long anyway. But it would be nice to have the car's Nav system operational. If it involves a big expense, forgettaboutit. If there's simple fix, I'd love to hear about it. Many thanks and Kind Regards