Ford 1998 Windstar Owner's Manual page 173

To ensure that the air bag system will operate as intended in a
crash, the system is equipped with a diagnostic module, which
controls a readiness lamp and a warning tone. The diagnostic
module monitors its own circuits, the air bag electrical system,
the air bag readiness light, the air bag power and the air bag
inflators.
The air bag supplemental restraint system uses a readiness light
and a tone to indicate the condition of the system. The
readiness light is in the instrument cluster. When you turn the
ignition key to ON, this light will illuminate for approximately
six (6) seconds and then turn off. This indicates that the system
is operating normally. NOTE: Maintenance of the air bag system
is not required.
A problem with the system is indicated by one or more of the
following:
the readiness light will either flash or stay illuminated,
or it will not illuminate immediately after ignition is turned
on,
a group of five beeps will be heard. The tone pattern will
repeat periodically until the problem and light are repaired.
If any of these things happen, even intermittently, have the air
bag system serviced at your Ford or Lincoln-Mercury dealer
immediately.
Disposal of air bags and air bag equipped vehicles
For disposal of air bags or air bag equipped vehicles, see your
local Ford or Lincoln-Mercury dealer. Air bags MUST be
disposed of by qualified personnel.
Seating and Safety Restraints
173