GMC Sierra 2018 Owner's Manual page 108

To reinstall the headrest:
1. Insert the headrest posts into
the holes in the top of the
seatback with the longer
chrome plated post toward the
driver side of the vehicle.
2. Push the headrest all the way
down until it contacts the top of
the seatback.
Double Cab Models
The rear outboard headrests should
be removed when installing
forward-facing child restraints.
To remove the headrest:
1. Press both buttons on the
headrest posts and pull up on
the headrest.
2. Store the headrest in a secure
place.
3. When the child restraint is
removed, reinstall the headrest
before the seating position
is used.
Seats and Restraints
To reinstall the headrest:
1. Insert the headrest posts into
the holes in the top of the
seatback with the longer
chrome plated post toward the
driver side of the vehicle.
2. Push the headrest all the way
down until it contacts the top of
the seatback.
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