<https://www.swedespeed.com/threads/daytime-running-lights.393/>
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"I picked up my new V40 this week and the rep from the dealer told me to put the headlight switch all the way (12 o'clock) and just leave it there.\n\nDoes this mean that my headlights are on all the time while driving?  How do the daytime running lights work?  I have a suspicion that there's a photoelectric sensor that turns on the lights all the way.  Or am I completely wrong?\n\nWhen I turn the switch back to the 9 o'clock position the headlights don't look any different.  When I look in the manual (honest I did it) the difference between the two postions is essentially the same according to the text.\n\nI've found the manual that came with the car really lacking.  Its thick but doesn't explain much.  I'm trying to figure out if the temperature reading is the interior or the exterior of the car.  Manual just doesn't say..."
<https://www.swedespeed.com/threads/daytime-running-lights.393/>