A vehicle seat assembly including a rail pair defining a mounting rail and
a triggering rail. One of the rails is supported on a floor pan of the
vehicle and the other is adapted to support a seat cushion. The rails are
moveably supported relative to each other. Also, included is a field
effect sensor operatively supported by the mounting rail such that the
field effect sensor can be positioned in a first range of positions as
well as second range of positions relative to the triggering rail. The
sensor is adapted to emit an electric field and to detect disruption of
the field when the field effect sensor is positioned in the first range
of positions.