GMC 2007 Acadia Owner's Manual page 469

To release the spare tire from the secondary latch:
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 under spare.
1. If the cable is not visible, start this procedure
at Step 3.
All-Wheel-Drive Vehicle shown
2. Turn the lug wrench counterclockwise until
approximately 6 inches (15 cm) of cable is
exposed.
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