I have a 2004 S500 4matic and just a few days ago the audio in the entire car has completely stopped working. i have tried a system reset numerous times but to no avail. i also tried to disconnect and attempt to reset the cd changed and navigation power sources by somebodys advice but that didnt work either. is there anything else i can try to do or should i take it to the dealer to look at?

 

Oh i also forgot to mention there is power coming to the navigation system and it is fully functional except for the fact that there is absolutly no volume

 

take it to the dealer, your car is still under warranty and its suppose to be free of charge.

 

Hey there. I know late but I just joined and noticed your issue. I had the same with my 2003 s500 4-matic. Dealer changed everything, including new cd-changer etc. 3 days later: same issue. After carefully reading the manual I dediced to power down the MB phone. Low and behold, I had my volume back. Even with the phone not working, some incoming signal had muted (!) everything thinking there was an incoming call. I called my MB dealer to inform *them*.