The power window switch may fail and the windows will not raise. The main switch at the front center console is commonly at fault. A failed switch will require replacement.Google+
Car Problem Reports
Mercedes-Benz ML430 Power Window Main Switch May Fail
Mercedes-Benz ML430 Problem
Average Mileage: 91,000 mi (10,000 mi - 173,000 mi)
Visitor, 2001 Mercedes-Benz ML430, 110,000 mi
driver side pwr window won't raise
Visitor, 1999 Mercedes-Benz ML430, 173,000 mi
Actually a 1998, for a few months, window would be difficult to get back up but would always go after messing around with it. Now it is totally unresponsive
Visitor, 2001 Mercedes-Benz ML430
Windows wouldn't go up or down. how can i fix it? pls help me
Door window down; switch doesn't work-getting it repaired.
Visitor, 1999 Mercedes-Benz ML430, 10,000 mi
the switch contact are not good, spring is too soft.
Visitor, 2001 Mercedes-Benz ML430, 136,000 mi
Windows wouldn't go up or down without pressing switch hard in different directions...replaced switch..works great!