Why can't the headlights of Mercedes-Benz A160 be turned off?
2 Answers
The headlights remain on and cannot be turned off because the automatic mode is activated. How to turn it off: "Auto" represents the automatic mode. Turn the switch to "0" or "off" to deactivate it. Function of automatic headlights: When the light dims during driving, the headlights automatically turn on, and they turn off when the light becomes brighter. The working principle of automatic headlights relies on a photosensitive sensor, which is usually located on the car's front dashboard or the top of the windshield. When the photosensitive sensor detects sufficient light, it remains in an open circuit state, keeping the headlights off. If the sensor detects insufficient light, the photosensitive material emits an electrical signal, automatically turning on the headlights without manual intervention.
I've encountered several cases where Mercedes-Benz A160 owners sought help because their headlights wouldn't turn off. Common issues include: a faulty headlight switch itself, possibly worn out or stuck, causing continuous current flow; relay failure keeping them constantly on; wiring short circuits or leaks allowing continuous power; or problems with the automatic headlight system's light sensor misjudging and keeping the lights on during daytime. It's recommended to first try repeatedly switching the lights on and off. If there's no response, open the front hood to check the fuse box and replace the relevant fuse. If that doesn't work, temporarily removing the fuse can turn off the lights to prevent battery drain, but don't rely on this long-term. Mercedes-Benz specialized repair shops have diagnostic tools that can quickly locate and fix the issue at reasonable costs. Delaying repairs will cause the battery to deteriorate faster and affect safe driving.