The auto-dimming mirror automatically adjusts for headlight glare
from vehicles behind you. Yes, you will absolutely notice it at night, if you switch it off in Uconnect! Note that the dimming function is disabled when you shift to reverse!
The auto-dimming mirror automatically adjusts for headlight glare.......Next item up for "is it working?" Mirror Dimmer! What does it do? Is this also a really subtle item? Will I only notice this at night with headlights shining into my rearview? So far I've not noticed any difference with it on or off... and I believe I was even looking at it at night...