A: In most of these systems, a rain sensor is located on the inside of the windshield behind the rear view mirror. Infrared light is projected outward through the windshield glass at a 45 degree angle ...

A: In most of these systems, a rain sensor is located on the inside the windshield behind the rear view mirror. Infrared light is projected outward through the windshield glass at a 45 degree angle.

Volvo has been granted an exemption by the Federal Motor Carrier Safety Administration to place a rain and ambient light sensor on the windshield of trucks in an area lower than what’s allowed by ...

Consumer Reports has no financial relationship with advertisers on this site. Ever wonder how your car knows it’s raining—and even how hard? Most rain-sensing wipers use a sensor that’s mounted behind ...