A method of detecting a defect light sensor, includes the operations of:—collecting data, comprising collecting light sensor data;—performing a preparation procedure on the collected data in order to determine a template; and—performing a detection procedure for determining a light sensor status. The operation of performing a preparation procedure includes determining a template of the behavior of the light sensor data collected during a time period constituting a part of a day with well-defined conditions The operation of performing a detection procedure includes the operations of:—collecting light sensor data for several further days during the corresponding time period;—selecting representative days thereof;—determining a corresponding behavior for each selected day; and—comparing the corresponding behavior with the template to detect any defect of the light sensor.