In the 2018 pressing this button toggles the auto-dim on and off. Holding the button toggles something with the compass (I didn't read that part).In my wife's 2015, you toggle the auto-dimming feature on/off by holding the center (rear-view) mirror's button for 3-seconds
I didn't like the auto dimming either in a loaner I drove, tinted my windows well and I don't really even need the feature, but sometimes use the manual flipper at bottom of my manual inside rearview to dim even more.kōbai-iro;7525783 said:You can press the mirror on-off button but as soon as you restart the car the mirrors are reactivated again. I didn't care for the dimming feature especially on the side mirrors- too much dimming made it actually harder to see traffic! The rear view mirror dimming was fine but the rear window is tinted so headlight glare wasn't too much anyway.
I disabled my rearview and side dimming mirrors by covering the light sensor on the lower edge of the rearview mirror facing you with black tape. It does disable all the mirrors dimming but it hasn't been an issue at all for me.
I went the other way on the '11 as I wanted the mirrors dimmed, so I covered the forward facing sensor (center of the mirror housing) with tape.kōbai-iro;7525783 said:I disabled my rearview and side dimming mirrors by covering the light sensor on the lower edge of the rearview mirror facing you with black tape. It does disable all the mirrors dimming but it hasn't been an issue at all for me. The only mirror feature I really like are the side mirror approach leds- the heated portion isn't the fastest but ok too. Anyway covering the light sensor with a tiny piece of tape is an easy option if you end up not liking the auto-dimming feature.