How do you get the Express window system on a Mercedes 1999 C280 to work I tried letting the window up and holding the window button for 2 extra seconds?

Answer 1

Just had the same problem with 2008 C300. The window would go up by holding the button, then back down a little when I released the button. THEN I held the button in the up position for about 2-3 seconds and it re-synced the express up feature. Good luck!