GMC Canyon 2015 Owner's Manual page 101

3-52 Seats and Restraints
Extended Cab
To remove the headrest:
1. Press the button on the side of
the headrest post on the top of
the seatback and pull up.
2. If removing the headrest to
install a booster seat in the left
rear seating position, store the
headrest in the left rear seat
storage area as shown. See
Underseat Storage on page 4-2.
Never install a forward-facing or
rearward-facing child restraint in
the left rear seating position.
3. If removing the headrest to
install as a seat cushion
extension for a forward-facing or
rearward-facing child restraint in
the right rear seating position,
see the instructions in Securing
a Child Restraint with the LATCH
System earlier in this section.
4. Always reinstall the headrest
before the seating position is
used by another occupant.
To reinstall the headrest:
1. If installed as a seat cushion
extension, first press both
buttons on the front of the seat
cushion to remove the headrest.