GMC Yukon Denalid Owner's Manual page 37

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.
CAUTION:
{
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.
6. Push and pull on the seatback to make sure it
is locked.
CAUTION:
{
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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