What's the reason when all car lights are not working?
1 Answers
Daytime running lights (DRL) failure may be caused by the following reasons: 1. The DRL function is turned off in vehicle settings; 2. Blown DRL fuse: A blown fuse usually causes both sides to stop working simultaneously. If only one side fails, it's not a fuse issue; 3. Wiring harness malfunction: Inspect the wiring between headlight control module and DRL; 4. Light guide ring driver failure: Such as loose or poor connection in driver connectors; 5. DRL bulb problem: If the bulb filament has quality issues, its resistance will increase with temperature rise, leading to decreased working current and eventual DRL shutdown.