The power windows are not working in car that may be caused by several factors. The most common reason is a terrible power windows motor, where the switch could be faulty. It is actually pretty simple animals made up of four main elements such as the window motor, windows regulator, assembly to hold the window and the control switch. When the switch is power ON, the electrical current goes to the motor pushing the window up or down in correlation with the direction of the switch. There is some safety features used in most of the window control systems such as thermal fuse. If there any return power or over use of current then the fuse wire will cut the power of the system until everything cools down. You can operate the windows from the individual door switches. The broken cables or loose connection may cause fail of the window.