Tesla Y 2019 Owner's Manual page 27

You can also fold the second row seat backs fully
forward by pressing the corresponding switch located
on the left side of the rear trunk. Pressing the switch
causes the seat back to swing forward. You can then
push it downward so it lays fully flat.
To return the seat backs to their upright position, pull it
upwards until it locks into place. To confirm that the seat
back is locked in the upright position, try pulling it
forward.
NOTE: Before raising a second row seat back, make sure
that the seat belts are not trapped behind the backrest.
WARNING: Always ensure the seat backs are
locked in their upright position by pushing it
forward or rearward. Failure to do so increases the
risk of injury.
Head Supports
The front seats include integrated head supports that
you can not adjust.
Seating and Safety Restraints
Front and Rear Seats
The second row outboard seats include an adjustable
head support that you can raise, lower, or remove. When
either of these seats is occupied by a passenger that is
not in a child safety seat, the corresponding head
support should be adjusted (align the center of the head
support with the center of the occupant's head) and
locked into position. To raise a head support on a
second row outboard seat, pull it upward to the desired
position. To lower it, press and hold the button on the
base of the outer post while pushing it downward.
NOTE: Depending on market region and country of
manufacture, your vehicle may not be equipped with
head supports than can be adjusted or removed.
The second row center seat are equipped with the
option to raise a head support. Initially stowed into the
seat's back rest, you can access the head support by
pulling it upward.
WARNING: When installing a child safety seat in a
second row seating position, you must lower the
head support. The headrest must be raised and
locked in place when sitting in the rear middle
seat.
To stow the head support in the second row center seat,
press and hold the button on the base of the post while
pushing the head support fully downward.
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