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 ML320 Power Window Main Switch May Fail
Mercedes-Benz ML320 Problem
Average Mileage: 110,046 mi (35,000 mi - 190,000 mi)
Visitor, 2001 Mercedes-Benz ML320, 55,000 mi
Power window circuit boasrd had to be replaced. Without warning driver window stuck in the down position
Visitor, 2001 Mercedes-Benz ML320, 154,000 mi
Driver's side window motor stalls. The window won't roll up or down;have to do it manually.
i went online and repaired window switch myself. it took alot of guts on my part to take apart the entire console but with the detailed instructions from google i was able to do it.
Visitor, 1999 Mercedes-Benz ML320
Driver side window would only go down but not up, had to replace the console switch assembly. This happened once in 2006 and then did it again in 2010.
Visitor, 2001 Mercedes-Benz ML320, 128,500 mi
Driver side power window will not close.
Visitor, 1999 Mercedes-Benz ML320, 125,000 mi
Driver's window would not go up. I had the assembly replaced October 2012 and now (July 2014) the replacement has failed. The local Mercedes dealer says it is out of the one year warranty and I must buy a new part.
Driver window went down but wouldn't come back up. Took blow dryer to switch and the heat caused the switch to make connection so window could go up. Replaced Switch @ 200.00
Driver side power window won't close. Will go down but not up.
The power windows on driver's side would not go up and down as supposed to using the switch from the center console. Sometimes it would only just go down and not back up. I assumed it was the motor, which I would then be required to purchase and replace.
As it turned out, all I had to do was take out the power window switch control and clean the contacts. I also had to bend the drivers's contact slightly to ensure contact. That was it! I put it all back together and it's been working since.
Visitor, 2001 Mercedes-Benz ML320
All the buttons came off due to me trying to put the window back up. For the life of me I couldn't put the window back up and my passanger window will not go down.