FORD 2002 E-450 v.2 - Manual (Page 119)

Failure to inspect and if necessary replace the safety belt
assembly under the above conditions could result in severe
personal injuries in the event of a collision.
Refer to Interior in the Cleaning chapter.
AIR BAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Your vehicle is equipped with a crash sensing and diagnostic module
which records information about the air bag and sensor systems. In the
event of a collision this module may save information related to the
collision including information about the air bag system and impact
severity. This information will assist Ford Motor Company in servicing
the vehicle and in helping to better understand real world collisions and
further improve the safety of future vehicles.
Seating and Safety Restraints
119