Light module for a lighting device of a motor vehicle and lighting device of a motor vehicle with such a light module

The module (5) has multiple semiconductor light sources in serial connection with each other. A circuit arrangement is assigned to and connected in parallel with the light sources. The arrangement includes multiple detectors for detection of a malfunction of the light source, where the arrangement bypasses the light source in case of malfunction of the light source. The detector monitors an applied voltage between an anode and a cathode, where the detector detects a change of optical properties of the light source.