I would check the owners manual first to see if it labels the fuses.
Usually this fuse box is under the hood. It could be a relay the is not
working. Either way I would get a voltmeter and turn on the high beams
and check for a 12 volt line. Probe the line in different spots to check for
a broken wire. Try to find a diagram online for your car and look for the
headlight circuit. Trace the circuit and you should be able to find the
problem. These kinds of problems can be very difficult with out the right
equipment and very time consuming. Best of luck
Just as a side note depending on the car it could be using a CAN system
and not getting a signal to the cars computer. Could also be as simple as
a bad switch.
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