Adding auto lights with factory light sensor

[Benjamin2000]

Hi everyone,

I have a 2018 Seat Leon MK3 ST (estate), Full-LED version. Unfortunately, my headlight switch doesn't have the AUTO position, so I don’t have automatic headlights. However, there is a sensor mounted behind the rearview mirror on the windshield – possibly a rain/light sensor. Also, in the infotainment settings, the “coming home/leaving home” light option is visible, but it doesn’t seem to work.

Out of curiosity, I tested whether the light sensor might be active. At night, I manually changed the system clock to daytime – but the built-in navigation remained in dark mode. This makes me think the car does in fact measure light levels outside, regardless of the set time, possibly using a light sensor that's already installed.

That makes me wonder if the car is already partially prepped for automatic headlights – maybe all it needs is a switch with the AUTO position and some coding. Has anyone here successfully added the AUTO headlight function to a similar model? Is there a proven method or retrofit kit that works with the Leon MK3 ST? I’ve attached a couple of photos in case that helps identify what’s already there.

Thanks in advance for any advice!

Cheers!

 

[East Yorkshire Retrofits]

It’ll have a humidity sensor installed. Replace with a rain light humidity sensor and replace the switch, then make the configuration changes

This has been covered loads of times on here and there’s multiple guides to follow