Both Headlights Work On Lowbeam But Not On Highbeam.

First identify if your day running lights (DRL) are working. The DRL and high beams will work on the same relay. If your DRL are working, but not your high beams, you may need to replace your high beam relay which is found in the fuse panel under the hood of the engine at the right back corner; near the firewall, and passenger tire strut mount. If there is also a problem with your DRL with the high beams, its likely the DRL relay which can be found tucked under the dash.

There's usually a cover that says "relays", "fuses", etc. Lift the cover and look underneath, it should label the relays. If not, consult a manual or repair book. Try swapping similar relays from know working accessories if you don't have a new one handy.