FORD 2002 Excursion v.2 - Manual (Page 136)

Failure to follow these instructions will affect the performance of
the safety belts and increase the risk of personal injury.
Safety belt pretensioner (if equipped)
Your vehicle is equipped with safety belt pretensioners at the driver and
front outboard passenger seating positions.
The Seat Integrated Restraints (SIR) seat is equipped with a buckle
pretensioner. Do NOT place objects between the seats, this could
interfere with the functioning of the pretensioner.
The safety belt pretensioners are designed to activate only during certain
frontal or near-frontal collisions with sufficient longitudinal deceleration.
A safety belt pretensioner is a device which tightens the webbing of the
lap and shoulder belts in such a way that they fit more snugly against
the body.
The driver and front outboard passenger safety belt system (including
retractors, buckles and height adjusters) must be replaced if the vehicle
is involved in a collision that results in the activation of the safety belt
pretensioners. Refer to the Safety belt maintenance section in this
chapter.
Failure to replace the safety belt assembly under the above
conditions could result in severe personal injuries in the event of
a collision.
Seating and Safety Restraints
136