I have a 2003 C240 and the rear sun shade seems to work sporadically. I've had problems with my radio since I bought the car last Dec. and when it rains alot (which it has been lately) the radio stops working--the display still lights up, but no sound--I think it's an exposed wire somewhere but the dealer insists it's the head unit and I need a new one...well, when the radio stopped working this past time, the rear sunshade started working...as soon as the radio started working, the rear sunshade stopped working!
Can someone tell me if they have had similar problems, or which one should I tackle first?

Thanks!

 

I had problems with the radiotoo - found out the trunk was leaking water and shorting out the amplifier mounted in the right rear area of the trunk rearward of the RR tire. Can't help with the sunshade issues though - maybe another trunk leak related issue?