Why do the headlights sometimes work and sometimes don't?

[TuckerFitz]

Car front headlights sometimes work and sometimes don't due to the following reasons: Automatic high/low beam switching function enabled: The vehicle is equipped with an automatic high/low beam switching function. When the light switch is in the Auto position, the low beams automatically turn on and the high beams turn off during oncoming traffic, so only the low beams are illuminated at that time. This indicates that the low beam function of the headlights themselves and the automatic low beam circuit control are functioning properly. Partial circuit failure: If the high beams can be turned on, then the high beam control switch, circuit, and headlights are all working correctly. In this case, only the circuit section related to the low beam switch may have an issue, possibly caused by burnt wires or mechanical stress leading to an open circuit.