Buick 2011 Lucerne Owner's Manual page 81

2. If the child restraint manufacturer recommends that
the top tether be attached, attach and tighten the
top tether to the top tether anchor, if equipped.
Refer to the child restraint instructions and the
following steps:
2. 1. Find the top tether anchor.
2. 2. Flip open the top tether anchor cover to
expose the anchor.
2. 3. Route, attach, and tighten the top tether
according to your child restraint instructions
and the following instructions:
2-48
If the position you are
using does not have a
headrest or head restraint
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
and you are using a dual
tether, route the tether
over the seatback.
If the position you are
using has a fixed
headrest or head restraint
and you are using a
single tether, route the
tether over the headrest
or head restraint.