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Use a test light at the connector, to the low beam lamp. Test for power and ground. If both wires are working then the issue is either the bulb or the connection. If testing the wires fails then it will need to be traced back to the source. When you activate the headlights the BCM receives the signal and sends power to either the low or high beam relay and from the relay to the appropriate lamp. If your looking for some other specific piece of information please write back. Good Luck.
It's the headlamp relay #46. If you want to test it, swap it out with the cooling fan relay #45 and see if your headlights work. If they do you know this is the fix. Found the solution online a couple of years ago and it was spot-on. The part was $45 at autozone at the time.
Well, the problem is that I dont know the reason, you should investigate. There could be issues with lamps (must get new) or electricity problems (must head to auto-service)
The problem could be the headlamp switch. You are right about the fuses.There is one for the LH high/low and one for the RH high/low. Have you tried turning on the lamps manually with the switch?
This sounds like a loose connection/bad wire somewhere for the low beam lights. Can't really give you more information without seeing the vehicle, and wiring diagram for the circuit. Usually, things that go on and off when hitting bumps are connection/wiring problems. The fact that one of your low beam headlamps burnt supports this theory. Bad connections or wiring mean lower voltage, thus higher amperage at the bulb, motor or whatever it's running, which makes them burn a lot quicker.
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