rear sunshade on CLK320

I had a similar problem with a 2008 E350, whose screen was stuck down. Apparently, the previous owner hadn't used it in several years. I could hear a relay or something clicking, but no motion. With the help of a knowledgeable friend who gently coaxed the shade up while i pushed the switch, it began to work properly and did for several years, until I sold the car. Try a gentle helper to coax the shade down while pushing the switch. If that fails, it could be a fuse (maybe) bad switch (maybe) or blown motor (hope not) In any event, the repair is not terribly expensive and worth the effort

thanks for your quick response! I'll try that! Any suggestions on aftermarket sound systems?

I generally shy away from them, I'm quite happy with the Harmon/Kardon that's installed by the gnomes in Bremen and Osnabrück