If the vehicle has normally turned off the headlight switch, but headlights are still on. The common reasons are the following.
1. The headlight switch is damaged, causing the switch signal to be disordered.
2. The headlight switch circuit is short-circuited, causing the headlight switch signal to be disordered.
3. Sensor signal error. The system mistakenly believes that the vehicle is in a dark state, so the headlights are always on.
4. The headlight relay or main control unit of lighting is damaged or caused by programming errors.