Lexus GS430 User Manual page 173

G16250
To adjust the height of the head restraint manually, adjust
it while pushing the button located on the shoulder.
After adjusting the head restraint manually, even if you adjust
the seat to the foremost (or rearmost) position using seat
position control, the head restraint may not be adjusted to the
lowest (or highest) position. And if the head restraint reaches
the highest (or lowest) position while the seat is being adjusted
backward (or forward), the head restraint will be fixed in that
position.
OCCUPANT RESTRAINT SYSTEMS
G16130
To move the head restraint forward or rearward, move the
head restraint as shown.
The head restraint is most effective when it is close to your
head. Therefore, using a cushion on the seatback is not
recommended.
CAUTION
Adjust the center of the head restraint so that it is
closest to the top of your ears.
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