Chevrolet 2011 Volt Owner's Manual page 110

3-54 Seats and Restraints
2.2. Route, attach, and tighten
the top tether according
to your 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.
I n f o r ma t i o n P r o v i d e d b y :
If the rear outboard seating
position you are using has
an adjustable head restraint
and you are using a dual
tether, route the tether
around the head restraint.