Self Dimming Mirror
Changed out my Interior mirror 2015 Trax LT that was manually operated with OnStar to upgraded OEM OnStar model that is supposed to self dim. My question is whether it needs to be "turned" on as all functions work correctly except the self dimming part. Do I need to bring it into dealer to be "turned" on to be functional as a self dimming mirror? Or any ideas here. Thanks in advance for help.