Ford Mustang Owner's Manual page 119

Automatic locking mode
In this operating mode, the lap belt retractor will
remain locked 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.
This mode must be used when installing a
forward facing child safety seat on the front
passenger seat. To switch the retractor from
the vehicle sensitive (emergency) locking
mode to the automatic locking mode,
perform the following steps:
Rear-facing child seats or infant carriers
should never be placed in the front seats.
1. Buckle the lap/shoulder belt.
2. Grasp the lap portion of the belt below the
child seat label. Pull upward until all of the
belt is extracted and a click is heard. At this
time, the lap belt retractor is in the
automatic locking mode (child restraint
mode).
3. 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.
4. Push down on the child seat as you pull
down on the belt to remove slack in the belt.
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