Many years ago, when the rain pours and you are inside your car with windows open, you would be hurrying to lift the windows up, manually. Chances are you could be wet even before you can fully move the windows up and end up pretty exhausted with the manual work, too. This is because power windows were not still available at that time.
But nowadays, life is easier. All you have to do is press a button and the windows move by themselves. This is made possible by the Mercedes window motor which is the heart of the power window system. This lifting mechanism is a small electric motor is connected to a worm gear and some other spur gears to produce a large gear reduction, supplying sufficient torque to move the window up. This is positioned in your vehicle's door and is typically fastened to the window regulator. On most US-made cars, the door on the driver's side possesses the left window motor while the door on the passenger side contains the right window motor.
But sometimes, your Mercedes window motor can freeze up or get clogged by debris. The result is, you can't either raise or lower you windows. Also, the window motor can most probably get burnt out.
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Source: http://dwyanethomas.articlealley.com/enjoy-your-power-window-system-with-a-functional-mercedes-window-motor-146440.html