What are the causes of BMW M3 headlight failure?

[McKate]

BMW M3 headlight failure can be caused by issues such as a faulty dimmer switch or problems between the terminal block and the dimmer switch. Fuse blown: If neither the high nor low beams illuminate when the headlight switch is turned on, check the fuse box for any blown fuses, then inspect for faults between the car's light switch and the dimmer switch. Dimmer switch failure: When using a screwdriver to bridge the dimmer switch's live wire to the high and low beam terminals, if both beams light up, it indicates a faulty dimmer switch. If only the high beam lights up while the low beam does not, the issue lies between the dimmer switch and the headlight or the low beam circuit.