The dusk sensor in your Golf GTI detects light levels and automatically turns on the headlamps when the light is low, helping you to drive more safely.
The dusk sensor system is fitted close to the rain sensor, behind your internal mirror. It detects light levels and automatically turns on the dipped headlights when the levels are low - for instance, when you are driving through a tunnel, at night or when dusk sets in. Your headlights must be switched on for the dusk sensors to work. They turn off automatically once you're back in the light.