Components diagnostics should be started from visual inspection. During inspection make sure the sidelights didn't get cracked and there are no damages on them, resulting from mechanical impact. After that you should exclude burning-out of LEDs or bulbs. Often, the sidelights function improperly because the battery is significantly or completely discharged. The electric circuit should be checked if the construction of the part is intact and defects named above were not detected during inspection. In some cases, defects may be caused by open or short circuit in the car electrical system. The control lamp will help to diagnose it. For more detailed inspection use the tester.
