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I would start by replacing one of the low beam bulbs. Sometimes what will happen is one of the lows will burn out, and you don't notice until the second bulb blows. Then of course you don't have any headlights! At least not on low beam and that get's noticed right away.
If you replace one of the low beams and it doesn't resolve the issue, then I would check the fuses under the hood. It looks like the relay for the headlights powers both the low and high beam bulbs. So, if they are good it could either be the daytime running light control module, OR the headlight switch itself. We will need a test light to check those items if the other 2 issues aren't the problem.
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