Vw sharan drivers window not working?

If the vehicel is several years old, this could be due to a fatigues cable in the gaiter which connects the door to the door column. The solution to this questions is answered elsewhere in this web site. it could laso be due to a failed window switch. To check this, remove the window switch be 'leavering'it out of its recess and use a voltmeter to check that when the button is pressed, a votage appears on the appropriate terminal to operate the window. You can check this out by first operating a window which works.