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Have you put new bulbs in recently? Those "hyper blue" eBay HID-like bulbs?
Or have you recently tried to put in any type of HID system?
If any of the cases above applies, then you probably melted/fried the wiring. If not, then no clue.
When putting in an HID system, a separate wiring harness is necessary because the stock wires are just not enough to handle the startup amperage that the ballasts require. Also, those cheap HID-like 9006 bulbs are often rated in WAY higher wattage than what your stock wiring will allow, and causes them to melt and fail.
If your headlights are stock, and have never been modified, a good place to start would be with the wiring, starting from the place where you tapped the parking light, going back into the car. If it's not wiring, then it must be the switch (if your relays and fuses are all okay).
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