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The high and low beam lights use the same power source, so if the low beams work the high beams have power. There is a low and high beam relay controlled by the dimmer switch. If the low beams work and the high beams don't, and the bulbs are good, check the dimmer switch and the high beam relay.
Every single time I have had a failure of low beam in a headlight without failure of high beam, it has been because the lamp bulb or halogen lamp module has reached the end of its serviceable life, not because of any wiring problems. Low beam burns out first because it is on the most. If low beam is lost simultaneously in both headlights, I would check fuse first, then the headlight switch. If low beam is lost on one side only, it is almost always going to be due to the bulb or lamp module needing to be replaced. In that case, replace them in both headlights because the other one will be going kaput in short order, as well.Also if you already replaced the fuse and bulb check the headlight dimmer control switch. Thanks for using Fixya.
......No other History, symptoms, clues, things already checked? Would check the fuses and relay box Would check the manual (haynes or ?), if separate relay(has contact points that can fail by repeated arc damage like a switch) for high beams, if so could potentially test by switching high relay with low or a test patch wire from battery to the high beam terminal of the relay. ...if not fuses or relays, then potentially the column light/dimmer stalk which is a much bigger pain... ...could also spray some electrical contact cleaner into the column dimmer/light stalk switch and see if any result. ...So, start with the headlights and work back toward the switch---verifying that can get each stage to cause the lights to function by bypassing direct to battery current source. ...hope may have helped