Buick Rendezvous 2003 Owner's Manual page 368

2. Turn the wrench counterclockwise until
approximately 6 inches (15 cm) of cable is exposed.
3. Attach the folding wrench to the jack and raise the
jack at least 10 turns.
4. Place the jack under the vehicle, ahead of the rear
bumper. Position the center lift point of the jack
under the center of the spare tire.
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5. Turn the folding wrench clockwise to raise the jack
until it lifts the secondary latch spring.
6. Keep raising the jack until the spare tire stops
moving upward and is held firmly in place, this
lets you know that the secondary latch has
released.