Where is the light sensor located that turns the headlights on when they're set to automatic? When I leave the underground garage at work, the headlights come on and will stay on even though it's bright sunlight outside. But then again, if it's just kind of gloomy/overcast during the day (when I'd like the lights to come on by themselves), I need to switch the headlights on manually. I know the light sensitivity is a dealer adjustment, but I thought I could get some understanding of the system.

 

Try these:
http://forums.e60.net/index.php?showtopic=9458

http://forums.e60.net/index.php?showtopic=12370

 

The light sensor is packaged with the rain sensor and both tucked up to the windscreen under rear view mirror (you can see the kinda rectangle shape outline from outside easier). It is a single part number that packages both sensors in one module.

 

Thanks Rudy. I can see this has been discussed plenty before.

 

I got the same behaviour but before 10am and after 6pm so I do not consider it as a bug but rather as a security of the software. During these times where, in winter, it is still dark, as soon as the sensor has detected a low light condition, the headlights will go on and stay to avoid you car, blinking due to light conditions which are at the border line... This is just an hypothesis I had...