I was showing my daughter how to jump start a car via Facetime when she got out of school. Great learning experience. So I figured I would show her how the Durango differs from her Avenger. While looking at the windshield I noticed a little square sensor looking thing on the drivers side of the rear view mirror. This sensor was facing the windshield. I know there is one in the glass part and think that's for auto dimming mirrors. What is the one in back of the mirror for? Also, what is the round half circle one on the dash for? It's in the center and under the windshield.
What are the 3 sensors actually for?

Lights and cruise control( ACC), this is why when the windshield is replaced, they have to do a "recalibration", thats what I have been told. When I asked why the ACC sensor/lense was also in the lower grill section I was met with blank stares.....

Mine doesn't have adaptive cruise control or auto dimming headlights. Just temperature for outside and dimming rear view mirror. Maybe it's all standard as far as the mirror and dash sensor looking thing but not installed kind of like navigation option on the radio that we don't have?

Does it have auto temp control(likely)? One of those sensors may well be a sun load sensor.

Yes it does. I am curious as to which one does what. Maybe I'll cover one up later when the sun is out and see if the headlights turn on. That should eliminate one as the light sensor.

You could try looking at a Durango manual online and see what sensor is what.

Didn't see anything specific for what I was looking for. Just said some features, but not what sensors are what.

The Durangos that have ACC have a big ugly thing in the middle of the lower grille, not the windshield like a lot of vehicles. Its an ugly feature but if you are shopping for a durango and want ACC its easy to spot in pictures.

This might help a little. https://www.dodgeparts.com/v-2014-dodge-durango--limited--3-6l-v6-flex/electrical--sensors

That helped to figure out the one that's round on the dash is the sun sensor, so that's for the automatic headlights. Now to find out what the little square one on the front of the rear view mirror is. The round one on the glass portion has to be for auto dimming mirror.

Thanks