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Key-in-ignition warning chime: Sounds when the key is left in the
ignition in the off or accessory 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 (the key is not in 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 3 mph
(5 km). If the warning remains on after the parking brake is off, contact
your authorized dealer as soon as possible.
Turn signal chime: Sounds when the turn signal lever has been
activated to signal a turn and not turned off after the vehicle is driven
more than 2 miles (3.2 km).
Message center activation chime: Sounds when some warning
messages appears in the message center display for the first time.
Overspeed chime (if equipped): Sounds when the vehicle speed
reaches 75 mph (120 km/h) or higher.
Airbag secondary warning chime: Sounds to inform the driver, in the
event that the airbag readiness warning lamp is inoperable, that there is
a fault in the supplemental restraint system.
Instrument Cluster
20
2010 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)