Acura 2008 TSX Owner's Manual page 146

Seats
FRONT
RELEASE BUTTON
The head restraints adjust for height.
You need both hands to adjust the
restraint. Do not attempt to adjust it
while driving. To raise it, pull upward.
To lower the restraint, push the
release button sideways, and push
the restraint down.
140
REAR OUTSIDE POSITION
RELEASE BUTTON
Removing the Head Restraint
To remove a head restraint for
cleaning or repair, pull it up as far as
it will go. Push the release button
and pull the restraint out of the seat-
back.
When reinstalling a head restraint,
put the legs back in place. Then
adjust it to the appropriate height
while pressing the release button.
Make sure the head restraint locks
in position when you reinstall it.
Failure to reinstall the head
restraints can result in severe
injury during a crash.
Always replace the head
restraints before driving.