Ford 1996 Bronco Manual page 31

Tone generator
The air bag readiness light indicates the air bag
system condition. However, a series of five sets
of five beeps will be heard only if the readiness
light does not work and there is a problem with
the air bag system. This also means that the Air
Bag Supplemental Restraint System (SRS) is in
need of service. The tone pattern will repeat
(five sets of five beeps) periodically until the
problem and light are repaired. Unless serviced,
the Air Bag Supplemental Restraint System may
not function properly in the event of a collision.
Do not attempt to service, repair, or
modify the Air Bag Supplemental
Restraint System or its fuses. See your
Ford or Lincoln-Mercury dealer.
The air bag system is designed to stay out of
sight until it is activated. The air bag system is
designed to deploy in frontal and front-angled
collisions more severe than hitting a parked
vehicle of similar size and weight head-on at
about 28 mph (45 km/h). Because the system
senses the crash severity rather than vehicle
speed, some frontal collisions at speeds above
28 mph (45 km/h) will not inflate the air bag.
The system activates when the sensors detect a
forward deceleration equal to or greater than the
deceleration experienced if you would drive
your vehicle into a solid wall at 14 mph. In
some side impacts, the forward deceleration of
your vehicle can be great enough to deploy your
air bag.
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