2012–2013
On the Volvo V40 Cross Country: fitted on every one of the 1 windscreen variant we list; model years 2012–2013.
Light sensors automatically turn your headlights on at dusk or in tunnels; the replacement windscreen must include the sensor bracket.
What it means
A light sensor is a small optical detector mounted on the windscreen or dashboard that monitors ambient light levels. When light drops below a threshold—at dusk or when entering a tunnel—it triggers your headlights to switch on automatically. This removes the need to manually operate the lights and improves safety by ensuring visibility when conditions darken suddenly. The sensor is typically mounted behind the windscreen's top edge or integrated into the interior mirror housing, where it has an unobstructed view of the sky.
How to tell
Check your vehicle's handbook or ask your dealer whether your car has automatic headlight control or 'auto lights' as a feature. If equipped, you'll see a symbol on the stalk or dashboard dial marked with a light-bulb icon or 'AUTO' setting. When you select this mode and the ambient light dims, the headlights activate without manual input. Not all cars have this feature; it's typically found on newer or higher-specification models.
Replacement impact
When replacing a windscreen on a vehicle with a light sensor, the replacement glass must include the correct sensor bracket or mounting point to preserve the auto-headlight function. The sensor itself does not require software calibration—it relies on physical positioning behind the windscreen's upper trim or within the mirror assembly. Ensuring the bracket is correctly installed during the fit is essential; if omitted, the auto-light feature will fail and cannot be restored without additional parts and labour.
