GMC 2012 Canyon Owner's Manual page 326

This vehicle has an underbody
mounted tire hoist assembly that
has a secondary latch system. It is
designed to stop the spare tire from
suddenly falling off the vehicle. For
the secondary latch to work, the
spare must be installed with the
valve stem pointing down. See
Storing a Flat or Spare Tire and
Tools under
.
Before beginning this procedure
read all the instructions. Failure to
read and follow the instructions
could damage the hoist assembly
and you and others could get
hurt. Read and follow the
instructions listed next.
To release the spare tire from the
secondary latch:
1. Check under the vehicle to see if
the cable end fitting is visible.
2. If the cable end fitting is not
visible, proceed to Step 6.
If it is visible, first try to tighten
the cable by turning the wheel
wrench clockwise until you hear
two clicks or feel it skip twice.
The cable cannot be
overtightened.
3. Loosen the cable by turning the
wheel wrench counterclockwise
three or four turns.
4. Repeat this procedure at least
two times. If the spare tire
lowers to the ground, continue
with Step 5 under Storing a Flat
or Spare Tire and Tools under
5. Turn the wrench
counterclockwise until
approximately 15 cm (6 in) of
cable is exposed.
6. Stand the wheel blocks on their
shortest ends, with the backs
facing each other.
.