The window regulator, lift motor and assemblies are the mechanics inside the vehicle that allow you to roll your windows up and down. Regulators driven by gears or pulleys are the most common. Operated by window switches, when these electric parts stop working, it can be challenging to come up with a diagnosis without removing the panels. Windows that don’t work can be a real hassle. They can also become a much larger problem if you try to use them, especially when the glass gets damaged.