Mirror, Automatic Day And Night: Operation: Notes
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Both the inside and outside automatic dimming mirrors receive battery current through a fused ignition switch output (run/start) circuit and fuse in the Body Control Module (BCM), and will only operate when the ignition switch is in the ON or START positions.