Why interior lights come on when i open the doors Toyota avensis?

The interior lights in your Toyota Avensis come on when you open the doors because of a switch that is activated when the door is opened. This switch is located in the door jamb, and it completes a circuit that allows electricity to flow to the interior lights. The purpose of this switch is to provide illumination inside the car when the doors are opened, making it easier for you to see when you enter or exit the car. In some Toyota Avensis models, there may also be an option to adjust how long the interior lights stay on after the doors are closed, or to turn the interior lights on or off manually.