Buick 2016 Regal Owner's Manual page 87

86 Seats and Restraints
Open the cover to expose
the anchor.
2.2. Route, attach, and tighten
the top tether according to
the child restraint
instructions and the
following instructions:
If the position you are
using does not have a
headrest or head restraint,
or the headrest or head
restraint has been
removed, and you are
using a single tether, route
the tether over the
seatback.
If the position you are
using does not have a
headrest or head restraint,
or the headrest or head
restraint has been
removed, and you are
using a dual tether, route
the tether over the
seatback.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a single
tether, route the tether
under the headrest or
head restraint and in
between the headrest or
head restraint posts.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a dual
tether, route the tether
around the headrest or
head restraint.