Philips H4 LED Ultinon Low Beam not working,but ok with standard bulb


Philips LED H4 low beam not working

Problem : Both headlight cannot switch to low beam.Always on to high beam.Encounter after 6 month of brand new installation

Finding : 1.Checks all fuses and relay =OK

           2. Try to swap with halogen H4 bulb = LED bulb can switch to low beam together with halogen bulb,swap with left and right

               halogen bulb