Battery run-down protection, Accessory power outlet(s), Accessory power – GMC 2009 Sierra User Manual

Page 156: Outlet(s)

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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. It can temporarily reduce the power demands of
some accessories.

Normally, these actions occur in steps or levels, without
being noticeable. In rare cases at the highest levels
of corrective action, this action may be noticeable to
the driver. If so, a Driver Information Center (DIC)
message might be displayed, such as Battery Saver
Active or Service Battery Charging System. If this
message is displayed, it is recommended that the
driver reduce the electrical loads as much as possible.
See DIC Warnings and Messages on page 3-59.

Battery Run-Down Protection

This feature shuts off the dome and reading lamps,
if they are left on for more than 10 minutes after
the ignition is turned off. The cargo lamp shuts off
after 20 minutes. This prevents the battery from
running down.

Accessory Power Outlet(s)

Accessory power outlets can be used to connect
auxiliary electrical equipment, such as a cellular
telephone or CB radio.

There are two accessory power outlets on the
instrument panel, one inside the center floor console
and one on the rear of the center floor console.

To access the accessory power outlet inside the center
floor console, press the button on the side of the console
door. See Center Console Storage on page 2-57 for more
information.

To use an accessory power outlet, remove the protective
cap. When not in use, always cover the accessory
power outlet with the protective cap.

Notice: If electrical devices are left plugged into a
power outlet, the battery may drain causing your
vehicle not to start or damage to the battery.
This would not be covered by the warranty.
Always unplug all electrical devices when turning
off your vehicle.

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