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Sensitive Auto Headlights?

Fierily

Member
Jun 5, 2020
31
36
Los Angeles
A while ago I noticed that the auto headlights are extremely sensitive and turn on as I'm driving during the day. They can remain on for a couple of minutes. I don't have to drive through a tunnel or shade for them to turn on. Tesla troubleshot it by covering the sensor on the windshield to gatherer data and ultimately said it might just be a safety thing. Is it just me? What's your experience with the auto lights?
 

RTPEV

Member
Mar 21, 2016
875
924
Durham, NC
I agree. My headlights are frequently on at times that mystify me. I.e. not just after pulling out of the garage or during stormy weather. I'm not really sure why. But it also doesn't bother me much. C'est la vie.
 

Big Earl

bnkwupt
Jul 12, 2017
5,322
9,850
Springfield, VA
I think we all notice the same, definitely a bug. As for why not run them all the time, the car already has LED running lights for that purpose. There is nothing gained by having both the headlights and the running lights on in the daytime.

It isn't a bug, it's just the way it is.
 

Candleflame

Active Member
Mar 9, 2015
2,794
1,289
QLD, Australia
mine are perfect. they come on nowadays in rain (didnt used to be the case, were tied to wiper blades which you dont really use if you have i.e. rainx) and when you go in tunnels or parking garages.
 

neurocutie

Member
Dec 2, 2019
347
167
upstate ny
Is it known which sensor the Auto Headlights uses to gage outdoor lighting levels? A camera? A separate photodiode or CdS cell? Perhaps something that could be altered to reduce the "sensitivity"?
 

neurocutie

Member
Dec 2, 2019
347
167
upstate ny
Strike that. Appears to be a light sensor above the front cameras.
hmm... so if I tape a neutral density filter over that... what else relies on that sensor? I suppose I want to go in the opposite direction though... somehow alter the adjustment of that sensor to make it think it is brighter than it is...

Do you know if its CdS or a light sensitive diode? If it is CdS, just putting a resistor in parallel might work.
 

RTPEV

Member
Mar 21, 2016
875
924
Durham, NC
Just came back from a trip to the mountains, pitch black at night, auto hi beams never activated? Had to turn them on manually. ☹️
I have mine set to AUTO, but I also have to re-enable them (push forward on the stalk) fairly often. I don't know why this is. I'll do that and it will remember that setting for a few days, and then I'll notice that the grayed out "A" light-bulb is no longer there, so I'll have to re-enable them. It's not a huge deal, but I don't understand why they can't get that setting to "stick".
 

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