There are right and left headlamp fuses, interior fuse box, not only check fuses, use a voltage tester on the circuit. Even if the fuse is good, if there is no voltage, the circuit is dead. Voltage to the headlamps is hot all the time. On and off-- high and low beams are controlled on the ground circuit. The headlamp switch is part of the ground circuit. Can the drl cause a problem, it might?