2010 GMC Acadia Owner's Manual - Page 392

10-76 Vehicle Care To release the spare tire from the secondary latch: Secondary Latch System This vehicle has an underbody mounted tire hoist assembly that has a secondary latch system. It is designed to stop the compact spare tire from suddenly falling off the vehicle if the cable holding the spare tire is damaged. For the secondary latch to work, the tire must be stowed with the valve stem pointing down. See Tire Changing on page 10‑67 for instructions on storing the spare tire correctly. { WARNING Someone standing too close during the procedure could be injured by the jack. If the spare tire does not slide off the jack completely, make sure no one is behind you or on either side of you as you pull the jack out from under the spare. 1. If the cable is not visible, start this procedure at Step 3. All‐Wheel‐Drive Vehicle shown 2. Turn the lug wrench counterclockwise until approximately 6 inches (15 cm) of cable is exposed. 3. Attach the lug wrench to the jack and raise the jack at least 10 turns. 4. Place the jack under the vehicle, ahead of the rear bumper. Position the center lift point of the jack under the center of the spare tire. { WARNING Before beginning this procedure read all the instructions. Failure to read and follow the instructions could damage the hoist assembly and you and others could get hurt. Read and follow the instructions listed next.