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Do both high beams work when you pull the turn signal switch towards the steering wheel for the flash to pass?
Ok, and both low beams work ok?
Do you have a digital multi meter to do a few tests. The dome lights in the headliner all run off of one power wire, you may want to check the bulbs. But the headlights are entirely different.
Go to the passenger side headlight bulb wiring connector and unplug the bulb. Turn the high beams on and check for power on the YELLOW/WHITE striped wire. Let me know if you have power there.
Then the problem is either the bulb or the socket for the bulb. You have power for both high and low beams, and they share the same ground, so the bulb or socket is the problem.