Inside Rearview Mirror with the Automatic Day-Night Feature System
Components
The automatic day-night feature system consist of an inside rearview
mirror.
Power and Ground of the Inside Rearview Mirror
| • | With the ignition ON, ignition voltage is supplied to the mirror from
the HVAC fuse in the I/P fuse block. |
| • | Ground for the mirror is provided by G402. |
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 rear 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 front of the mirror or windshield side.
The ambient light sensor is used to determine light conditions present at the mirror.
With automatic day-night feature enabled, the mirror uses ambient light sensor
to determine the exterior light condition. With a low light condition detected, and
a high light condition from behind 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 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. In night time conditions only, the mirror monitors
this input to disable the automatic day-night feature which allows the face to
gradually change to a normal state. This allows the driver to see objects in the
mirror clearly when backing up.
Switches of the Inside Rearview Mirror with the Automatic Day-Night
Feature
The inside rearview mirror has three switches that perform the following
functions:
| • | The switch at the center of the mirror is used to enable or disable
the automatic day-night feature. With the ignition in the ON position,
depress the switch to enable the automatic day-night feature of the
mirror. A green indicator will illuminate on the mirror when
the automatic day-night feature is enabled. To disable
the automatic day-night feature of the mirror, depress the switch again. |
| • | The other two switches are for turning the map lights on the mirror
ON and OFF. |
Switches of the Inside Rearview Mirror with the Automatic Day-Night Feature
without Compass with OnStar®
The inside rearview mirror has 4 switches that perform the following functions:
| • | The on/off switch for automatic day-night feature of the inside rearview
mirror is located at the left side of the mirror. The on/off switch
is used to enable or disable the automatic day-night feature of the mirror. With
the ignition in the ON position, depress the on/off switch to enable the automatic
day-night feature of the mirror. A green indicator will illuminate
on the mirror when the automatic day-night feature is enabled. To
disable the automatic day-night feature of the mirror, depress the on/off
switch. |
| • | The three switches on the right side of the mirror are for OnStar®
operation. For more information, refer to
OnStar Description and Operation
in Cellular Communication. |
