Toyota Lexusc Owner's Handbook Manual page 184

4 Move the seatback angle control switch backward to
flatten the seatback.
OCCUPANT RESTRAINT SYSTEMS
5 Push the seat position control switch downward to lower
the seat at the same level as the rear seat (driver's seat
only).
After returning the seat to its original position, be certain to
replace the head restraint.
CAUTION
D Do not allow passengers to ride on the flattened seat
while driving; use the seat in the normal position.
D After putting back the seat, try pushing the seatback
forward and rearward to make sure it is secured in
place. Be certain to replace head restraint.
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