GMC 2008 Envoy - Manual (Page 389)

Turn the wheel wrench counterclockwise to lower
the spare the rest of the way.
13. Tilt the retainer at the end of the cable and pull it
through the wheel opening. Pull the tire out from
under the vehicle.
Notice: If you drive away before the spare tire or
secondary latch system cable has been reinstalled,
you could damage your vehicle. Always reinstall
this cable before driving your vehicle.
14. Turn the wheel wrench clockwise to raise the cable
back up if the cable is hanging under the vehicle.
Have the hoist assembly inspected as soon as you can.
You will not be able to store a spare tire using the hoist
assembly until it has been repaired or replaced.
5-95