GMC 2009 Sierra - Manual (Page 405)

9. Position the center lift point of the jack under the
center of the spare tire.
10. Turn the 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 under the spare.
13. Disconnect the jack handle from the jack and
carefully remove the jack. 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 end of 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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