Honda Civic Hybrid 2009 Owner's Manual page 100

Seats
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,
then pull the restraint out of the seat-
back.
Failure to reinstall the head
restraints can result in severe
injury during a crash.
Always replace the head
restraints before driving.
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.
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Active Head Restraints
The driver's and front passenger's
seats have active head restraints. If
the vehicle is struck severely from
the rear, the occupant properly
secured with the seat belt will be
pushed against the seat-back and the
head restraint will automatically
move forward.
This reduces the distance between
the restraint and the occupant's head.
It also helps protect the occupants
against whiplash and injuries to the
neck and upper spine.
After a collision, the activated
restraint should return to its normal
position.
If the restraints do not return to their
normal position, or in the event of a
severe collision, have the vehicle
inspected by a Honda dealer.