See also:

ON
This is the normal operating position after the engine is started. ...

For U.S.A
The following information has been compiled according to Code of Federal Regulations “Title 49, Part 575”. ...

Active head restraint (if equipped)
Active head restraint (if equipped) The front seats of your vehicle are equipped with active head restraints. They automatically tilt forward slightly in the event the vehicle is struck from the rear ...