Hummer 2010 H3 - Manual (Page 152)

6-8 Lighting
Dome Lamp Override
The dome lamp override button is
located below the exterior lamps
control.
E (Dome Lamp Override): Press
the button in to turn the lamps off.
In this position, the dome lamps will
remain off when the doors are open.
To return the lamps to automatic
operation, press
E
again and
return it to the out position. With the
button in this position, the dome
lamps will come on when a door is
opened.
Reading Lamps
The reading lamps are located in
the overhead console.
Press the button located next to
each lamp to turn them on or off.
These lamps will not come on with
the dome lamps.
Lighting Features
Exit Lighting
The interior lamps come on when
the key is removed from the ignition.
The lamps will not come on if the
dome override button is pressed in.
Battery Load
Management
The vehicle has Electric Power
Management (EPM) that estimates
the battery's temperature and state
of charge. It then adjusts the voltage
for best performance and extended
life of the battery.
When the battery's state of charge
is low, the voltage is raised slightly
to quickly bring the charge back up.
When the state of charge is high,
the voltage is lowered slightly to
prevent overcharging. If the vehicle
has a voltmeter gauge or a voltage
display on the Driver Information
Center (DIC), you may see the
voltage move up or down. This is
normal. If there is a problem, an
alert will be displayed.
The battery can be discharged at
idle if the electrical loads are very
high. This is true for all vehicles.
This is because the generator
(alternator) may not be spinning fast
enough at idle to produce all the
power that is needed for very high
electrical loads.