Ford 1998 Windstar Owner's Manual page 164

When reinstalling a rear seat in your vehicle it must be
placed in its original position. Improper installation of
the seat will prevent correct use of the safety belts and
could increase the risk of injury. Refer to the warning
label on the seat belt.
Your vehicle is equipped with a dual locking mode retractor on
the shoulder belt portion of the combination lap/shoulder safety
belt for front passenger and rear seat window passengers.
Dual locking mode retractors operate in two ways:
Vehicle Sensitive (Emergency) Locking Mode
In this operating mode, the shoulder belt retractor will allow the
occupant freedom of movement, locking tight only on hard
braking, hard cornering or impacts of approximately five mph
(8 km/h) or more.
Automatic Locking Mode
In this operating mode, the shoulder belt retractor will be
automatically locked and 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 fit on occupant
Child seat or infant carrier restraint
Rear-facing infant seats should never be placed in the front seat.
This mode must be used when installing a child seat on the
front passenger seat and rear window seats where dual locking
retractors are provided.
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