Buick 2005 Rendezvous - Manual (Page 405)

To release the spare tire from the secondary latch, do
the following:
{ 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.
1. If the cable is not visible, start this procedure at
Step 3.
2. Turn the wrench counterclockwise until
approximately 6 inches (15 cm) of cable is exposed.
All-wheel-drive Vehicle shown
5-85