GMC 2008 Yukon Denali Owner's Manual page 18

Returning the Seat(s) to the Sitting
Position
To return the seat to the sitting position, do the following:
1. Pull the seat down until it latches to the floor. The
seatback cannot be raised if the seat is not latched
to the floor.
CAUTION:
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If the 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 seatback to be sure it is
locked.
2. Lift the seatback and push it rearward. Push and
pull on the seatback to make sure it is locked.
1-14
CAUTION:
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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.
3. Make sure that the safety belt in the center seating
position is not caught between the two seats and is
not twisted.