Ford Mercury Villager 1997 Owner's Manual page 174

Built-In Child Seat Retractors
The retractor will switch from the emergency locking mode to the
automatic locking mode when the right shoulder belt is pulled
all the way out. The retractor will switch back to emergency locking
mode when the belts are unbuckled and the shoulder belts
retract completely.
The automatic locking mode must be used to hold small children
in position, particularly sleeping children and those who may
try to squirm out of the belts. The emergency locking mode is used
while buckling the belts.
Always adjust the lap and shoulder harness belts provided with
this child seat snugly around your child.
Failure to follow all of the instructions on the use of this
child restraint system can result in your child striking
the vehicle's interior during a sudden stop or crash.
How to Use the Built-In Child Seat
Read the following procedures and all of the labels on the
built-in child seat before using the seat.
Never use the Built-In Child Seat as a booster cushion
with the adult safety belts. A child using the adult belts
could slide forward and out from under the safety belts.
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WARNING
WARNING