GMC Sierra Denali 2006 Owner's Manual page 365

9. Position the center lift point of the jack under the
center of the spare tire.
10. Turn the wheel wrench clockwise to raise the jack
until it lifts the end fitting.
11. Continue raising the jack until the spare tire
stops moving upward and is held firmly in place.
The secondary latch has released and the spare tire
is balancing on the jack.
12. Lower the jack by turning the wheel wrench
counterclockwise. Keep lowering the jack until the
spare tire slides off the jack or is hanging by
the cable.
CAUTION:
{
Someone standing too close during the
procedure could be injured by the jack.
If the spare tire does not slide off the jack
completely, make sure no one is behind you or
on either side of you as you pull the jack out
from the spare.
13. Disconnect the jack handle from the jack. Carefully
remove the jack from underneath the vehicle.
14. Use one hand to push against the spare while
firmly pulling the jack out from under the spare
tire with the other hand.
If the spare tire is hanging from the cable, insert
the hoist handle, extension and wheel wrench into
the hoist shaft hole in the bumper and turn the
wheel wrench counterclockwise to lower the spare
the rest of the way.
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