Your vehicle may have this feature. While sitting in a comfortable driving position, adjust the rearview mirror so you can see clearly behind your vehicle. Grip the mirror in the center to move it up or down and side to side. The day/night control, located at the bottom of the mirror, adjusts the mirror to reduce headlamp glare from behind during evening or dark conditions. Turn the control clockwise for night use; return it to the center for daytime use.