What does a window regulator do?

The role of a window regulator in a car
A window regulator is a key component that connects the door glass to the interior control system, translating the driver's or passenger's commands for raising or lowering the window into its upward or downward movement. Its core functions include:

Support and guidance: Metal rails or arms provide a stable movement path for the window, preventing tilting or binding.
Power transmission: Manual window regulators rely on a mechanical linkage of a linkage or cable, while electric window regulators use a motor to drive the cable, enabling smooth and rapid raising and lowering.
Sealing and noise reduction: Maintains a seal on the door during movement, preventing rain from seeping in and reducing wind noise.
How do you know if your window regulator is faulty?
Common signs of a malfunctioning window regulator

Slow or jerky movement: The window moves noticeably slower or stops at a certain point after the switch is pressed.
Unusual noises: Scrubbing, rattling, or humming noises can indicate wear on the internal gears or cables. Unidirectional movement: The window only moves up or down, usually indicating a broken transmission component or motor failure.
Asymmetrical glass position: The window has a gap when closed or deviates from its original path when opened.
The motor is not working and there is no current: Check the power supply and wiring. If the motor itself does not rotate, it may be burned out.