GMC 2009 Yukon XL Owner's Manual page 486

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6. Use the wheel wrench
hook that allows you to
pull the hoist cable
towards you, to assist
in reaching the
spare tire.
7. 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.