The door for the vanity mirror (or the frame for the door) can break; due to a redesign, the mirror "cassette" will need replacement.Google+
Car Problem Reports
Mercedes-Benz S430 Vanity Mirror Door May Break
Mercedes-Benz S430 Problem
Average Mileage: 89,333 mi (10,000 mi - 180,000 mi)
Visitor, 2002 Mercedes-Benz S430
Visitor, 2001 Mercedes-Benz S430, 118,000 mi
Bought the car w/118K miles and the passenger side vanity mirror door was already broken.
Visitor, 2004 Mercedes-Benz S430, 48,000 mi
the vanity door is broken
Visitor, 2005 Mercedes-Benz S430, 74,600 mi
vanity mirrors wont stay up o keep the light on.
Visitor, 2004 Mercedes-Benz S430, 56,400 mi
vanity mirror door broke