Parts that work on a consistent basis are subject to wear and tear, but everything that breaks can usually be replaced. This Genuine BMW window regulator is just the part that you'll need to get those windows rolling up again.

The window regulator is the device that raises and lowers the glass in your window when you push the power button. Most makes and models continue to have individual controls situated near each window, allowing passengers to open or close the nearest window. Yet, when they break, those controls are rendered useless.