GMC 2008 Yukon Denali Owner's Manual page 430

9. Position the center lift point of the jack under the
center of the spare tire.
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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.