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check the fuses both for high and low beams..
one of the head light fuse is blown,,,,,,,,,,,,
if you have a multimeter check for voltage to the bulb connectors. it shall be 12 Volts continuous without any drop. with the same multi meter check for bulb resistance there are 3 (legs) 2 elements on a halogen place black probe on the middle one and check for other 2 for continuity & resistance if bulb is defective you will notice the difference between the bulbs. IF the connector legs have melted due to lose plug connection you must use correct bulb wattage or change wiring to a thick gauge for higher wattage bulbs. do the needful and report the findings please