FORD 2013 Flex v.1 - Manual (Page 179)

WARNING: Before returning the seatback to its original position,
make sure that cargo or any objects are not trapped behind the
seatback. After returning the seatback to its original position, pull on
the seatback to ensure that it has fully latched. An unlatched seat may
become dangerous in the event of a sudden stop or collision.
4. Ensure that the rear latch hooks
are properly engaged with the floor
striker.
Note: Ensure that the seat and seatback are latched securely in position.
Keep floor area free of objects that would prevent proper seat
engagement.
WARNING: Do not adjust or release the seat floor latch while
vehicle is in motion. Do not operate the vehicle with seats in
tumbled position. Always latch the vehicle seat to the floor, whether the
seat is occupied or empty. If not latched or if the seat is tumbled, the
seat may cause injury during a sudden stop.
Seats 179
2013 Flex (471)
Owners Guide gf, 1st Printing
USA (fus)