LED lights failure check

In connection with these low powers that differ considerably from a light-bulb version, there may be problems with the bulb failure monitor on different towing vehicles during operation. As monitoring of the direction indicators is required by law, we recommend operating the lamp only in connection with a direction indicator control unit, Hella part number 5DS 009 552-... .
Beyond that, further light functions are detected by some towing vehicles. This represents a comfort function of the vehicle that is not required by law and does not exempt the driver from his or her duty to visually check the lighting equipment. Also in this case, there may be a wrong diagnosis (instrument panel in the driver’s cab indicates a bulb failure although the bulb is working) due to the low powers.
If faulty diagnoses such as those described above should occur during operation with your towing-vehicle type, please contact the towing-vehicle manufacturer.