This listing is for W639 master window switch part number 6395450913 this is a genuine item to suit all vitos/ vianos from 2003-2012

The window switch in a car is an essential component that allows the driver or passenger to control the opening and closing of the windows. It is usually located on the door of the car, and it can operate all the windows at once or independently control each window's movement. The window switch is responsible for sending electrical signals to the motor that triggers the window regulator to lift or lower the window glass. It works by completing the electrical circuit, and when the switch is pushed or pulled, it sends an electric current to the window motor, which in turn activates the window's movement. With the help of the window switch, the driver or passenger can adjust the window's position to provide better ventilation, regulate temperature and airflow, as well as improve visibility while driving.

Modern window switches can come in different shapes, sizes, and designs. Some can add extra features such as auto-down or auto-up function, where drivers can activate the switch once, and the window will automatically roll down or up to the desired position. Additionally, some window switches have child-lock capabilities that can prevent children from opening or closing the window accidentally. Overall, the window switch is an essential aspect of a car's convenience and safety features, allowing drivers and passengers to control the windows' movement without having to lean over to manually operate the windows or rely on other individuals to adjust them.