Application: The rain/light sensors (RLS) from HELLA are used in various vehicles, primarily for an automatic rain or light system. This relieves the driver by virtually eliminating the need to react to manually operate the wiper lever in the rain or the light switch in the dark (tunnels, garages, twilight). HELLA offers various sensor types that are optimally tailored to the respective vehicle. The installation situation and the characteristics of the windscreen to which the sensors are attached are always checked very individually, in close consultation with the motor vehicle manufacturer. From HELLA's perspective, the light function of the RLS is safety-relevant according to ISO 26262. Structure and function: The rain sensor is used to detect different rain situations in the sensor area and thus controls the front windscreen wipers. Intervention by the driver is virtually no longer necessary. As a light sensor, it controls the switching on and off of the low beam in different lighting conditions or in special situations, e.g. driving in a tunnel.