Buick 2005 Century Owner's Manual page 46

Lower Anchorages and Top Tethers
for Children (LATCH System)
The vehicle has the LATCH system. You will find
anchors in all three rear seating positions.
This system, designed to make installation of child
restraints easier, does not use the vehicle's safety belts.
Instead it uses vehicles anchors and child restraint
attachments to secure the restraints. Some restraints
also use another vehicle anchor to secure a top
tether strap.
1-40
A. Lower Anchorage
B. Lower Anchorage
C. Top Tether