GMC 2006 Sierra - Manual (Page 507)

1. Open the spare tire lock cover on the bumper and
use the ignition key to remove the lock, if equipped
with a spare tire lock (J).
2. Assemble the wheel wrench (H) and the two jack
handle extensions (I) as shown.
3. Insert the hoist end
(open end) (F) of the
extension through
the hole (G) in the
rear bumper.
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
on page 5-105.
5-95