A device for checking the evaluation circuit for automatic switching operations of the illumination devices in vehicles. A sensor device contains a global sensor for detecting the light conditions in the environment of the vehicle and a directional sensor for the directed detection of the light conditions...http://www.google.com/patents/US6525478?utm_source=gb-gplus-sharePatent US6525478 - Device for checking the evaluation circuit for automatic switching operations of illumination device in vehicles
