What is the reason for the right front headlight of the Volkswagen Passat not working?

[MaverickLee]

Reasons for the right front headlight of the Volkswagen Passat not working: Component issues: Short circuit in the power line before the light switch, burnt-out filament, or blown fuse. Turn on the headlight switch, connect the "live wire" terminal of the dimmer switch to the low beam terminal, and observe the headlight: if it lights up, the dimmer switch is damaged; if it still doesn't light up, there is a broken wire between the dimmer switch and the wiring harness or both low beam filaments are burnt out. You can use a test light on the low beam terminal of the left or right wiring board: if the test light lights up, the low beam filament is burnt out; if the test light doesn't light up, there is a broken wire between the dimmer switch and the wiring harness. Timely repair is necessary to avoid affecting nighttime driving. Poor contact: Poor contact or closure of the bimetallic strip in the light switch, or damage to the light switch. If one position of the light switch is properly connected, some lamp wire iron parts may disconnect due to bimetallic contact.