Ford 2003 Mustang Owner's Manual page 11

Instrumentation
Air bag readiness
Momentarily
illuminates when the
ignition is turned ON.
If the light fails to
illuminate, continues to flash or remains on, have
the system serviced immediately.
Safety belt warning chime
Chimes to remind you to fasten your safety belts.
For information on the safety belt warning chime,
refer to the Seating and safety restraints chapter.
Supplemental restraint system (SRS) warning
chime
For information on the SRS warning chime, refer to
the Seating and safety restraints chapter.
Key-in-ignition warning chime
Sounds when the key is left in the ignition in the
OFF/LOCK or ACC position and the driver's door is
opened.
Headlamps on warning chime
Sounds when the headlamps or parking lamps are
on, the ignition is off (and the key is not in the
ignition) and the driver's door is opened.
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