2002 GMC Envoy Owner's Manual - Page 304

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 properly stored. 1. To remove the underbody-mounted spare, insert the socket end of the extension, on an angle, into the hole in the rear bumper. Be sure the socket end of the extension connects into the hoist shaft. 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. 3. Put the spare tire near the flat tire. 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. 5-20