GMC Yukon Owner's Manual page 69

4. Push and pull on the seat to make sure it is locked
into place. The seatback cannot be raised to the
upright position unless the seat is secured to the
floor.
5. Pull up on the seatback until it locks into the
upright position.
WARNING:
If either seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatbacks to be sure they
are locked.
6. Push and pull on the seatback to make sure it is
locked.
WARNING:
A safety belt that is improperly routed, not
properly attached, or twisted will not provide the
protection needed in a crash. The person wearing
the belt could be seriously injured. After raising
the rear seatback, always check to be sure that
the safety belts are properly routed and attached,
and are not twisted.
7. Make sure the safety belts are returned to the
original position over the seatbacks.
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