Entry/Exit Lighting; Reading Lamps; Electric Power Management; Battery Run-Down Protection - GMC 2008 Savana Van Owner's Manual

Entry/Exit Lighting

Your vehicle has an illuminated entry/exit feature.
When a door is opened or the key is removed from
the ignition, the dome lamps will come on if the dome
override button is in the out position.

Reading Lamps

For vehicles with reading lamps, press the button
located next to each lamp to turn it on or off.
Your vehicle may also have reading lamps in other
locations. To turn each one on or off, press the button
located next to the lamp. The lamps cannot be adjusted.

Electric Power 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 put the charge back in. When
the state of charge is high, the voltage is lowered slightly
to prevent overcharging. If the vehicle has a voltmeter
gage or 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.
A high electrical load occurs when several of the
following loads are on: headlamps, high beams, rear
window defogger, climate control fan at high speed,
engine cooling fans, trailer loads, and loads plugged
into accessory power outlets.
EPM works to prevent excessive discharge of the battery.
It does this by balancing the generator's output and the
vehicle's electrical needs. It can increase engine idle
speed to generate more power, whenever needed.

Battery Run-Down Protection

This feature shuts off the dome lamps if they are left on
for more than 10 minutes when the ignition is in LOCK.
This will help prevent the battery from running down.
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