Automatic Day-Night Mirror Description and Operation
Inside Rearview Mirror with the Automatic Day-Night Feature
System Operation
The inside rearview mirror uses 2 photocell sensors. One sensor
is the headlight sensor, located on the face side of the mirror.
The headlight sensor is used to determine light conditions present
at the mirror face. The other sensor is the ambient light sensor,
located on the rear of the mirror or windshield side. The ambient
light sensor is used to determine the exterior light conditions.
With a low exterior light condition detected, and a high light
condition from behind of the car, at the headlight sensor, the
inside rearview mirror will automatically darken the face of the
mirror.
In the daytime, the mirror is in a normal state because of the
high exterior light condition that is indicated by the ambient
light sensor. With the gear selector lever in the REVERSE position,
backup lamp supply voltage is supplied as an input to the inside
rearview mirror. The mirror monitors this input to disable the
automatic day-night feature. This allows the driver to see objects
in the mirror clearly when backing up, even during the night.
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