GMC 2010 Sierra - Manual (Page 565)

5. Use the wheel wrench
hook which allows you
to pull the hoist cable
towards you to assist in
reaching the spare tire.
6. Tilt the tire toward the vehicle with some slack in
the cable to access the tire/wheel retainer.
Separate the retainer from the guide pin by sliding
the retainer up the pin while pressing down on the
latch.
6-105