See also:

Vanity mirror
The light comes on when you open the cover. ...

Windshield wipers/washers
Windshield wipers and washers 1 Rain sensor* on/off 2 Thumb wheel sensitivity/frequency CAUTION • Use ample washer fluid when washing the windshield. The windshield should be thoroughly wet ...

Limitations
Strong sunlight, reflections, extreme light contrasts, the use of sunglasses, or if the driver is not looking straight ahead may make the visual warning signal in the windshield difficult to see. ...