Ford Mercury Villager 1997 Owner's Manual page 140

Automatic locking mode
In this operating mode, the shoulder belt retractor will be
automatically locked and will remain locked when the combination
lap/shoulder safety belt is buckled, and does not allow the
occupant freedom of movement. This mode provides the following:
A tight lap/shoulder belt on the occupant.
Child safety seat installation.
Rear-facing child seats or infant carriers should never be
placed in the front seats.
This mode must be used when installing a child safety seat on
the front passenger seat and rear outboard seats where dual locking
retractors are provided.
To switch the retractor from the emergency locking mode to the
automatic locking mode, perform the following steps:
1. Buckle the lap/shoulder combination belt.
2. Grasp the shoulder portion of the belt and pull downward
until all of the belt is extracted and, when allowed to
retract, a clicking sound is heard. At this time, the belt retractor
is in the automatic locking mode (child restraint mode).
3. A clicking sound will continue to be heard as the belt is
allowed to retract. This indicates that the retractor is in the
automatic locking mode.
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