GMC Hybrid 2006 Owner's Manual page 46

9. Now connect the black negative (−) cable to the
negative (−) terminal of the good battery. Use a
remote negative (−) terminal if the vehicle has one.
Do not let the other end touch anything until the next
step. The other end of the negative (−) cable doesn't
go to the dead battery. It goes to your vehicle's
remote negative (−) terminal, marked GND. The
electrical connection is just as good there, and the
chance of sparks getting back to the battery is
much less.
5-18
10. Now start the vehicle with the good battery.
11. Try to start the hybrid vehicle. Hold the key in the
start position for at least three seconds. If the
hybrid vehicle still does not start, turn the key to
LOCK and wait 5 minutes.
12. After 5 minutes try to start the hybrid vehicle again.
13. Repeat steps 11 and 12 several more times as
necessary. If the hybrid vehicle still will not start,
your vehicle needs service.
Notice: If the jumper cables are connected or
removed in the wrong order, electrical shorting may
occur and damage the vehicle. The repairs would
not be covered by your warranty. Always connect
and remove the jumper cables in the correct
order, making sure that the cables do not touch
each other or other metal.