2003 GMC Yukon Owner's Manual - Page 431

1. If your vehicle is equipped with a hoist lock (J), open the spare tire lock cover on the bumper and use the ignition key to remove the lock. 3. Insert the hoist end (open end) (F) of the extension through the hole (G) in the rear bumper. 2. Assemble the wheel wrench (H) and the two jack handle extensions (I) as shown. Be sure the hoist end of the extension connects to the hoist shaft (E). The ribbed square end of the extension is used to lower the spare tire. 4. Turn the wheel wrench (H) counterclockwise to lower the spare tire to the ground. Continue to turn 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. 5-73