The electric rearview mirror automatically controls the glare from the headlights of the car behind you in nighttime or low light driving conditions.
When the engine is running, the glare is automatically controlled by the sensor mounted in the rearview mirror. The sensor detects the light level around the vehicle, and automatically adjusts to control the headlight glare from vehicles behind you.
Whenever the shift lever is placed in R (Reverse), the mirror will automatically go to the brightest setting to improve the driver’s view behind the vehicle.

To operate the electric rearview mirror:
CAUTION
When cleaning the mirror, use a paper towel or similar material dampened with glass cleaner. Do not spray glass cleaner directly on the mirror as that may cause the liquid cleaner to enter the mirror housing and damage the rearview mirror.
Day/Night rearview mirror (if equipped)
Blue Link® center (if equipped)Hyundai Tucson (LM) 2010-2015 Owners Manual: Fuses
A vehicle’s electrical system is protected from electrical overload damage by
fuses.
This vehicle has 2 (or 3) fuse panels, one located in the driver’s side panel
bolster, the other in the engine compartment near the battery.
If any of your vehicle’s lights, accessories, or controls do ...
Hyundai Tucson (LM) 2010-2015 Service Manual: Windshield Glass Components and Components Location
Components
1. Windshield side molding2. Windshield glass
...