Ford Mystique Owner's Manual page 113

Double check that the retractor is in the automatic locking
7.
mode. Try to pull more belt out of the retractor. If you
cannot, the belt is in the automatic locking mode. See
Figure 8.
Check to make sure that the child seat is properly secured
8.
prior to each use. If the belt is not locked, repeat steps 4
through 7.
To remove retractor from automatic lock mode, unbuckle the
belt and allow the webbing to retract fully. A click will be
heard as the belt retracts. The belt is back in normal operating
mode (vehicle sensitive emergency locking mode) when this
click disappears.
Seating and Safety Restraints
113