Honda Civic Coupe 2009 Owner's Manual page 104

Seats
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
98
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.
For a head restraint system to work
properly:
Do not hang any items on the head
restraints, or from the restraint
legs.
Do not place any object between
an occupant and the seat-back.
Install each restraint in its proper
location.
Only use genuine Honda
replacement head restraints.