Ford Mercury Villager 1997 Owner's Manual page 161

Routing the safety belt tongue through the child seat (captain's chair shown)
3. Pull on the belt until all of the stored belt is out of the retractor
and a click is heard.
4. Allow the belt to retract. A clicking sound will be heard as the
belt retracts. This indicates that the retractor is in the
automatic locking mode.
Seating and Safety Restraints
157