One or more door windows may stop working due to a failed window regulator. Replacement of the failed regulator will be necessary to correct this concern.Google+
Car Problem Reports
Mercedes-Benz S420 Window Regulator Failure is Common
Mercedes-Benz S420 Problem
Average Mileage: 143,515 mi (54,000 mi - 213,000 mi)
Visitor, 1996 Mercedes-Benz S420, 134,721 mi
Windows do not raise up or roll down.
Visitor, 1997 Mercedes-Benz S420, 132,000 mi
Back passenger window won't go up!!
window wont come down or go up
Visitor, 1995 Mercedes-Benz S420, 68,000 mi
back windows dont work. If you put them down they dont come back up. Is this a recall that is covered?
Visitor, 1998 Mercedes-Benz S420, 54,000 mi
Rear Passenger window will go down but will not up. Power windows. Replace regulator.
Visitor, 1995 Mercedes-Benz S420, 177,888 mi
Rear left window does not close completely,
Visitor, 1997 Mercedes-Benz S420, 152,000 mi
Window would not roll up. Mechanic removed door panel and had to order new window regulator. Estimated cost for parts and labor: $300.00
I heard a pop in the window regulator which bust the window on the driver's side. It sounded like someone had hit the window with a baseball bat. Immediately I could hear glass fall within the door and then the window slowly started to slide down.
Replaced Convenience Module in trunk with a used part procured online for $150. Resynchronized windows. Works perfectly.