Buick 2007 Terraza Owner's Manual page 482

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.
482
To release the spare tire from the secondary latch,
do the following:
1. Place the jack under the vehicle, ahead of the
rear bumper. Position the center lift point of
the jack under the center of the compact
spare tire.
2. Turn the folding wrench clockwise to raise the
jack until it lifts the secondary latch device
under the wheel plate.