Adjusting the rearview mirror dimming function
Bright light entering the vehicle from behind, e.g. from the headlights of following vehicles, could reflect in the rearview mirror and door mirrors and cause a glare. Use the dimming function when light from behind is distracting.
Auto-dim
If bright light enters the vehicle from behind, the door mirrors will automatically dim when it is dark outside or when lighting conditions are low, for example when driving in tunnels.
Auto-dim can be set in the center display to be active or not active while driving.
Tap 
in the center display.
in the center display.Tap Controls.
Choose a setting under Mirror auto-dimming.
Dimming is automatically adjusted via the light sensors in the rearview mirror.
Note
If the sensors are obstructed by e.g. a parking permit, transponder, sunshade or objects on the seats or in the cargo compartment in a way that prevents light from reaching the sensors, the auto-dim function in the door and rearview mirrors will be reduced.