Toyota FJ Cruiser 2014 Manual page 52

1-3. Adjustable components (seats, mirrors, steering wheel)
Removing rear seat bottom cushions
When loading large luggage items, the cushion can be removed.
Do not remove the cushion for normal usage.
Dial
52
Push the lock release button
and fold down the seatback.
Loosen the bolts with a wrench
at first and turn the dials by hand
to remove them.
Hexagon
head bolt