Cadillac 2008 SRX Owner's Manual page 14

The front seat head restraints can also tilt forward and
rearward. The second row seat head rests do not tilt.
Pull up or push down to adjust the second and third row
seat head rests, if the vehicle has them.
1-10
Pull the restraint up to
raise it. To lower it, press
the button, located on
the top of the seatback,
and push the head
restraint down.
The third row seat head rests can be removed from the
seatback. To do this, press the button, located on the top
of the seatback, and pull them out from the seatback.
Store the head rest, front side facing up, in the
compartment behind the third row, by inserting the
head rest posts into the slots in the storage area.