2008 GMC Yukon Owner's Manual - Page 468

Secondary Latch System Your vehicle has an underbody-mounted tire hoist assembly equipped with a secondary latch system. It is designed to stop the spare tire from suddenly falling off your vehicle. For the secondary latch to work, the spare must be installed with the valve stem pointing down. See Storing a Flat or Spare Tire and Tools on page 5-104. {CAUTION: 11. Tighten the nuts firmly in a crisscross sequence as shown by turning the wheel wrench clockwise. When you reinstall the regular wheel and tire, you must also reinstall either the center cap, bolt-on hub cap, or plastic nut caps, depending on what your vehicle has. 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. • For center caps, line up the tab on the center cap with the slot on the wheel. The cap only goes on one way. Place the cap on the wheel and press until it snaps into place. • For bolt-on hub caps or plastic nut caps, line up the nut caps with the wheel nuts and tighten them clockwise by had to get them started. Continue tightening with the wheel wrench until snug. 5-100