Ford 1996 Windstar Manual page 27

Inflated passenger-side air bag
If the air bag is inflated, THE AIR BAG WILL NOT
FUNCTION AGAIN AND MUST BE REPLACED
IMMEDIATELY. If the air bag is not replaced, the
unrepaired area will increase the risk of injury in a
collision.
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.
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RWARNING