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Two thoughts
1) start by checking the fuses - as high beams are controlled/fused by a different circuit than low beams. If fuses all check out, then look at relays
2) to add to Mr. Merk's post -- another issue/concern with putting LED bulbs into H4 headlight assemblies (that were designed to use halogen bulbs) is that the incandescent (Halogen) bulb produces all of its light from a single point, while the LED substitute produces light from several modules spaced along its shaft (see the picture in the link F1LOCO posted). Since the H4 reflector/assembly was designed to focus light from the single point source halogen bulb, using a LED substitute will invariably compromise the accuracy of the H4 reflector/assembly, resulting in what may appear to be "brighter" light that's not contained/controlled by the h4 assembly in the same manner as a "real" H4 halogen bulb (and that can therefore distract oncoming cars, etc.)
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