Lincoln MKZ Owner's Manual page 127

Fold the seatback(s) down.
Note: If the front seats interfere
with folding the seatbacks, you will
need to remove the rear seat head
restraints. To remove the rear seat
head restraints, see removal
instructions under Second-row
adjustable head restraints in this
chapter.
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.
Make sure that the safety belt for the rear center passenger is properly
routed over the rear seatback.
2012 MKZ (378)
Owners Guide, 1st Printing
USA (fus)
Seating and Safety Restraints
127