A vehicular rain sensor system for detecting precipitation on an exterior surface of a window including a illumination sensor that is decoupled from the window. The illumination sensor is preferably an imaging array sensor which communicates a signal to a control which further determines whether rain...http://www.google.com.au/patents/US20020056805?utm_source=gb-gplus-sharePatent US20020056805 - Interior rearview mirror system including a forward facing video device
