All of sudden, my electric window on the driver side was not working properly. It went up but did not go down with the control panel. It was so inconvenient whenever I needed to get in and out from car parks, to pay tolls, etc.
I checked the window control panel, the other 3 buttons worked perfectly. Only the driver side window didn’t work. Someone suggested that the problem was the comfort control unit.

Bought an used one, the electric window problem fixed.