Inside Rearview Mirror with the Automatic Day-Night Feature System
Components
The inside rearview mirror with the automatic day-night feature system
consists of an inside rearview mirror.
Inside Rearview Mirror with the Automatic Day-Night Feature System
Operation
With the ignition switch in the ON position, ignition 3 voltage is supplied
through the HVAC fuse to the inside rearview mirror. The inside rearview mirror
uses 2 photocell sensors in order to determine light conditions
in the front and the back of the vehicle. At night, with the automatic
day-night feature enabled, the mirror automatically darkens to reduce
the glare from the headlamps from behind. In the daytime, the mirror
is in a normal state. With the gear selector lever in the REVERSE
position, backup lamp supply voltage is supplied as an input
to the inside rearview mirror. The inside rearview mirror will gradually
change to a normal state as a result of the backup lamp supply
voltage input. Ground for the inside rearview mirror is provided by G302.
Compass
The electronic compass includes a magnetic field sensor and a microprocessor.
The microprocessor receives inputs from the sensor, processes these
inputs, and provides a heading on the compass display.
Switches of the Inside Rearview Mirror with the Automatic Day-Night
Feature and Compass (w/o UE1)
The inside rearview mirror has three switches that perform the following
functions:
| • | The IO switch located at the center of the mirror performs the
following functions: |
| - | To enable or disable the automatic day-night feature of the mirror.
With the ignition in the ON position, depress the IO switch for
3 seconds 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 IO switch for 3 seconds. |
| - | To turn the compass on and off. With the ignition in the ON position,
depress the IO switch for 4 seconds to turn the compass on. Depress the IO
switch for 4 seconds again to turn the compass off. |
| • | The other 2 switches are for turning the map lights on the mirror
ON and OFF. The map light switches are also used to place the compass into
a calibration mode. For more information, refer to
Compass Calibration and Magnetic Variance |
Switches of the Inside Rearview Mirror with the Automatic Day-Night
Feature and Compass (w/ UE1)
The inside rearview mirror has four switches that perform the following
functions:
| • | The on/off switch located at the left side of the mirror performs
the following functions: |
| - | To enable or disable the automatic day-night feature of the mirror.
With the ignition in the ON position, depress and hold the on/off switch for
4 seconds 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 and hold the on/off switch for
4 seconds. |
| - | To turn the compass on and off. With the ignition in the ON position,
depress the on/off switch to turn the compass on. Depress the on/off switch
again to turn the compass off. The on/off switch is also used
to place the compass into a calibration or zone mode. For more
information, refer to
Compass Calibration and Magnetic Variance
. |
| • | The 3 switches on the right side of the mirror are for OnStar®
operation. For more information, refer to
OnStar Description and Operation
in Cellular Communication. |
