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:
Security indicator light
Refer to “Security indicator light”. ...
If the light illuminates constantly
If the light illuminates constantly while driving or does not turn off after
the engine starts, an emission control system malfunction has been detected.
You should have your vehicle checked by an ...
Oil pressure warning light
If this light illuminates when the engine is running, it may indicate that the engine oil pressure is low and the lubricating system is not working properly.
If the light illuminates while driving ...