FORD 2002 F-550 v.1 - Manual (Page 15)

Supplemental restraint system (SRS) warning chime
Sounds when a malfunction in the supplemental restraint system (front
or side airbags) has been detected. Have the supplemental restraint
system inspected immediately.
Key-in-ignition warning chime
Sounds when the key is left in the ignition and the driver’s door is
opened.
Headlamps on warning chime
Sounds when the headlamps or parking lamps are on, the key is removed
from the ignition and the driver’s door is opened.
Parking brake ON warning chime
Sounds when the parking brake is set, the engine is running and the
vehicle is driven more than 5 Km (3 mph).
GAUGES
Instrument cluster
15