what is a auto dimming exterior mirror
Dimming mirrors used in the automotive industry are fitted with sensors to detect the intensity of the light. Usually, there are two sensors, one pointed to the front and the other to the rear. The interior mirror's sensors and electronics control the dimming of both interior and exterior mirrors. The sensors, when active, are constantly looking for low ambient light. Poor lighting tells the sensors you are driving at night and they begin looking for a glare source which may impair your vision.