Use a meter or test light to check whether you're getting power to the passenger side low beam filament when the low beams are turned on. If there is no power at that point, then the circuit is open somewhere along the path between the headlight switch and the bulb. It could be a bad contact at a connector in the electrical plug at the bulb, or in a harness plug, or in just one contact of the multifunction switch or headlight relay (there, only if the left and right headlights are switched independently of each other). If it's none of those; then it is probably a broken wire.
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