Photosensors

The mirror has a photosensor attached on the front and back sides. During nighttime driving, these sensors detect distracting glare from vehicle headlights behind you and automatically dim the mirror to eliminate glare and preserve your vision. For this reason, use care not to cover the sensors with stickers, or other similar items. Periodically wipe the sensors clean using a piece of dry soft cotton cloth or an applicator.
See also:
Door open indicator light
When any of the doors, the rear gate (Outback) or the trunk lid (Legacy) is not
fully closed, the door open indicator light illuminates. This function is effective
even if the ignition switch is ...
The Inside
While it's possible to get fairly comfortable in many cars, it's not every
day that you feel like everything is right in terms of your driving position,
and that's how I felt in the Impreza 2.5GT. ...
Corrosion protection
Your SUBARU has been designed and built to resist corrosion. Special materials
and protective finishes have been used on most parts of the vehicle to help maintain
fine appearance, strength, and r ...
