Chevrolet Malibu 2010 Owner's Manual page 43

To lower the rear seatback, pull up on the seatback
strap while folding the seatback down. This allows
access to the trunk.
To raise the rear seatback pull the seatback up and
make sure it latches. Push and pull on the seatback to
be sure it is locked in position. Make sure that the
safety belts are properly stowed over the seatback in all
three positions.
2-10
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.
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.
When the seat is not in use, it should be kept in the
upright locked position.