In this video, we learn how to adjust the interior lights in a 2010 Prius. To adjust the intensity of lights, rotate the thumb wheel that is left to the steering wheel. Rotating up increases the intensity of the lights. Rotating downwards dims the instrument panel lights. There is a central light switch located on the roof. There are three positions that turn the lights on, off, and auto. There are also right and left map lights which you can switch to turn on or off. The lighting in this car can help your passenger find something or look up directions while driving!