GMC Hybrid 2006 Owner's Manual page 44

The remote negative (−) terminal is located on the
engine accessory drive bracket behind the power
steering pump and is marked GND. Do not connect
the jumper cables to any part of the power steering
pump or hoses.
See Engine Compartment Overview on page 5-4 for
more information on location of the positive (+)
and negative (−) terminals.
5-16
CAUTION:
{
Using a match near a battery can cause battery
gas to explode. People have been hurt doing
this, and some have been blinded. Use a
flashlight if you need more light.
Be sure the battery has enough water. You do
not need to add water to the battery installed
in your new vehicle. But if a battery has filler
caps, be sure the right amount of fluid is there.
If it is low, add water to take care of that first.
If you do not, explosive gas could be present.
Battery fluid contains acid that can burn you.
Do not get it on you. If you accidentally get it
in your eyes or on your skin, flush the place
with water and get medical help immediately.
CAUTION:
{
An electric fan can start up even when the
engine is not running and can injure you. Keep
hands, clothing and tools away from any
underhood electric fan.