Buick 2003 Rendezvous Owner's Manual page 383

To continue changing the flat tire see "Removing the
Flat Tire and Installing the Spare Tire" later in this
section.
2. If it's not visible, see "Secondary Latch System"
following.
If it is visible, first try to tighten the cable by turning
the folding wrench clockwise until you hear two
clicks or feel it skip twice. You cannot over-tighten
the cable.
3. Then loosen the cable by turning the wrench
counterclockwise three or four turns.
4. If the spare tire has not lowered, tighten the cable
all the way and then loosen it at least two times.
If the spare tire did lower to the ground, continue
with Step 5 under "Removing the Spare Tire
(Vehicles with the Rear Convenience Center)"
earlier in this section.
5. If you still cannot lower the spare tire to the ground,
see "Secondary Latch System" following.
If the spare tire will not lower, the secondary latch may
be engaged causing the tire not to lower. Do the
following to check the cable:
1. Check under the vehicle to see if the cable is
visible.
Secondary Latch System
Your vehicle has an underbody mounted tire hoist
assembly equipped with a secondary latch system. It's
designed to stop the compact spare tire from suddenly
falling off your vehicle if the cable holding the spare tire is
damaged. For the secondary latch to work, the tire must
be stowed with the valve stem pointing down. See
"Storing the Spare Tire and Tools" later in this section for
instructions on storing the spare tire correctly.
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