GMC Envoy 2003 Owner's Manual page 356

2. Turn the wheel wrench counterclockwise to lower
the spare tire. Keep turning the wheel wrench until
the spare tire can be pulled out from under the
vehicle.
If the spare tire does not lower to the ground, the
secondary latch is engaged causing the tire
not to lower. See "Secondary Latch System" later in
this section.
When the tire has been completely lowered, 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: To help avoid vehicle damage, do not drive
the vehicle before the cable is restored.
3. Put the spare tire near the flat tire.
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4. Use the chisel end of the wheel wrench to pry off
the center cap.
See "Removing the Flat Tire and Installing the Spare
Tire" later in this section to continue changing the
flat tire.