Ford Mercury Villager 1997 Owner's Manual page 164

The automatic locking mode is activated whenever all of the belt
webbing is pulled out of the retractor.
While in this mode, the belt will retract or tighten but cannot be
pulled back out to obtain more length. To disengage the
automatic locking mode, unbuckle the belt and allow the webbing
to retract fully.
Attaching Safety Seats With Tether Straps
Some manufacturers make safety seats that include a tether strap
that goes over the back of the vehicle seat and attaches to an
anchoring point. Other manufacturers offer the tether strap as an
accessory. Contact the manufacturer of your child safety seat
for information about ordering a tether strap.
All vehicles built for sale in Canada include tether anchor
hardware for use with Canadian child safety seats. The tether
anchor hardware is located in the tire changing tool kit. Additional
tether anchor hardware can be obtained at no charge from any
Ford or Lincoln-Mercury dealer.
Vehicles built for sale in the USA do not include tether anchor
hardware, but it can be obtained at no charge from any Ford or
Lincoln-Mercury dealer (Part number F3XY-12613D20-A).
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