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Most likely the headlight relay. The relay switches between high and low beams. As low beams are used more, they are the relay contacts more prone to corrosion
you may have a bad relay. If both of them are out, that is probably the relay for the high beams or it could also be a fuse.
I'm not sure if it is the same on a 98 as an 04. But on an 04 there is a relay box under the hood that has a relay for high beams and a relay for low beams. On an 04, it is on the driver's side behind the battery. You can check the relay by popping it out and exchanging it with another one that is working. Hope this helps
Check the headlight bulbs.
Your low beams might be burned out, or your switch is not working in low beam.
Not usually. Disconnect it and see what happens.
Get a new headlight switch even check your bulbs might help
If the high and low beam headlights stopped working on a 2000 Toyota Tundra, the fault could be with the headlight relay switch. This is a large fuse located in the fuse box on top of the battery.
Do your headlights work? High beams more specifically? If that answer is yes, then the bulbs are fine. DRLs are nothing more than a lower voltage being sent to the high beams in the Sunfires. (They use 9007 HB5 bulbs, which is a dual filament. highs and lows in one bulb). IF the LOW beams work, but not the high, try new bulb. Otherwise its off to try and find that relay... which is a pain in the ass. Personally, I pulled my relay out and never put it back in (I have HIDs in the car now).
Have you checked the daytime running light module?
if your dims work, but brights don't then it's probably your high beam switch.
The circuit is simple .... headlamp bulbs to relay to fuses to switch .... ttroubleshoot those items and you'll find the glitch