R.
If the selector switch is placed in the L position and the up switch is depressed, battery positive
voltage will be supplied to the left outside rearview mirror vertical motor through the left mirror
motor down control circuit and ground through the left mirror motor left control circuit. If the
down switch is depressed, battery positive voltage will be supplied to the left outside rearview
mirror vertical motor through the left mirror motor left control circuit and ground through the left
mirror motor down control circuit.
The remainder of the mirror functions operate in the same manner as described above. Placing the
power mirror switch in opposing positions, left/right or up/down, will reverse the polarity to the
mirror motor, reversing the direction of movement.
AUTOMATIC DAY-NIGHT MIRROR DESCRIPTION AND OPERATION
Inside Rearview Mirror with the Automatic Day-Night Feature System Components
The inside rearview mirror with the automatic day-night feature system consists of the following
components:
Inside rearview mirror
Ambient air temperature sensor
Inside Rearview Mirror with the Automatic Day-Night Feature System Operation
The mirror has two buttons at the bottom for the reading lamps on the mirror. These buttons are
also utilized for controlling the automatic day-night ON/OFF functions, compass calibration,
temperature and compass ON/OFF function and temperature units displayed.
To turn the automatic day-night mirror OFF, press and hold the left button for approximately 5
seconds and release when the green light goes off. Repeat to turn back ON. The auto dimming
feature defaults to ON with every key cycle.
The inside rearview mirror uses 2 photocell sensors. One sensor is the rear light sensor, located on
the face side of the mirror, facing the rear of the vehicle. The rear light sensor is used to
determine light conditions present at the mirror face. The other sensor is the front light sensor,
located on the backside of the mirror, facing the front of the vehicle. The front light sensor is used
to determine the exterior light conditions at the front of the vehicle. With a low exterior light
condition detected by the front light sensor and a high light condition from the rear light sensor,
the inside rearview mirror will automatically darken the face of the inside rearview mirror.
With the gear selector lever in the REVERSE position, backup lamp supply voltage is supplied as
2007 Hummer H3
2007 ACCESSORIES & EQUIPMENT Mirrors - H3