Cadillac 2008 CTS Owner's Manual page 7

Push down on the head restraint after the button is
released to make sure that it is locked in place.
The vehicle's head restraints are not designed to
be removed.
Pull the head restraint up to
raise it. To lower the head
restraint, press the button,
located on the top of the
seatback, and push the
restraint down.
Active Head Restraint System
On vehicles with an active head restraint system in the
front outboard seating positions. These automatically
tilt forward to reduce the risk of neck injury if the vehicle
is hit from behind.
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