Ford 2003 Mustang Owner's Manual page 98

Seating and safety restraints
3. While holding the
shoulder and lap belt
portions together, route
the tongue through the
child seat according to
the child seat
manufacturer's
instructions. Be sure
the belt webbing is not
twisted.
4. Insert the belt
tongue into the proper
buckle (the buckle
closest to the direction
the tongue is coming
from) for that seating
position until you hear
a snap and feel the
latch engage. Make
sure the tongue is
latched securely by pulling on it.
5. To put the retractor
in the automatic
locking mode, grasp
the shoulder portion of
the belt and pull
downward until all of
the belt is extracted
and a click is heard.
6. Allow the belt to retract. The belt will click as it
retracts to indicate it is in the automatic locking
mode.
7. Pull the lap belt
portion across the child
seat toward the buckle
and pull up on the
shoulder belt while
pushing down with
your knee on the child
seat.
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