Ford 1997 Aerostar Manual page 129

and the electrical wiring which connects the
components.
The diagnostic module monitors its own internal
circuits and the supplemental air bag electrical
system readiness (including the impact sensors),
the system wiring, the air bag system readiness
light, the air bag backup power and the air bag
igniters.
Determining if System Is Operational
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: Routine 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 lit,
the readiness light will not light 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 Supplemental
Restraint System serviced at your Ford or
Lincoln-Mercury dealer immediately. Unless
serviced, the system may not function properly
in the event of a collision.
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