See also:

Windshield washer fluid warning light
This light illuminates when the fluid level in the windshield washer fluid tank decreases to the lower limit (approximately 0.6 US qt, 0.6 liter, 0.5 Imp qt). ...

Engine
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Photosensors
Photosensors The mirror has a photosensor attached on both the front and back sides. If the glare from the headlights of vehicles behind you strikes the mirror, these sensors detect it an ...