GMC Sierra Hybrid 2011 Owner's Manual page 62

10-16 Vehicle Care
If the vehicle's 12 volt battery has
run down, you may want to use
another vehicle and some jumper
cables to start your vehicle. Use the
following steps to do it safely.
WARNING
Batteries can hurt you. They can
be dangerous because:
They contain acid that can
burn you.
They contain gas that can
explode or ignite.
They contain enough
electricity to burn you.
If you do not follow these steps
exactly, some or all of these
things can hurt you.
Notice: Ignoring these steps
could result in costly damage to
the vehicle that would not be
covered by the warranty.
Trying to start the vehicle by
pushing or pulling it will not
work, and it could damage the
vehicle.
1. Check the other vehicle. It must
have a 12 volt battery with a
negative ground system.
Notice: Only use vehicles with
12-volt systems with negative
grounds to jump start your
vehicle. If the other vehicle's
system is not a 12-volt system
with a negative ground, both
vehicles can be damaged.
2. Get the vehicles close enough
so the jumper cables can reach,
but be sure the vehicles are not
touching each other. It could
cause a ground connection you
do not want. You would not be
able to start your vehicle, and
the bad grounding could damage
the electrical systems.
To avoid the possibility of the
vehicles rolling, set the parking
brake firmly on both vehicles
involved in the jump start
procedure. Put the automatic
transmission in P (Park) or a
manual transmission in
N (Neutral) before setting the
parking brake. If you have a
four-wheel-drive vehicle, be sure
the transfer case is in a drive
gear, not in N (Neutral).
Notice: If you leave the radio or
other accessories on during the
jump starting procedure, they
could be damaged. The repairs
would not be covered by the
warranty. Always turn off the
radio and other accessories when
jump starting the vehicle.
3. Turn off the ignition on both
vehicles. Unplug unnecessary
accessories plugged into the
cigarette lighter or the accessory
power outlets. Turn off the radio
and all the lamps that are not
needed.