Ford F-250 Owner's Manual page 172

Seating and Safety Restraints
Safety belt warning light and indicator chime
The safety belt warning light illuminates in the instrument cluster and a
chime sounds to remind the occupants to fasten their safety belts.
Conditions of operation
If...
The driver's safety belt is not
buckled before the ignition
switch is turned to the on
position...
The driver's safety belt is
buckled while the indicator
light is illuminated and the
warning chime is sounding...
The driver's safety belt is
buckled before the ignition
switch is turned to the on
position...
Belt-Minder
The Belt-Minder feature is a supplemental warning to the safety belt
warning function. This feature provides additional reminders to the
driver that the driver's safety belt is unbuckled by intermittently
sounding a chime and illuminating the safety belt warning lamp in the
instrument cluster.
If...
The driver's safety belt is not
buckled before the vehicle has
reached at least 3 mph
(5 km/h) and 1-2 minutes have
elapsed since the ignition
switch has been turned to the
on position...
The driver's safety belt is
buckled while the safety belt
indicator light is illuminated
and the safety belt warning
chime is sounding...
172
2011 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)
Then...
The safety belt warning light
illuminates 1-2 minutes and the
warning chime sounds 4-8 seconds.
The safety belt warning light and
warning chime turn off.
The safety belt warning light and
indicator chime remain off.
Then...
The Belt-Minder feature is activated
- the safety belt warning light
illuminates and the warning chime
sounds for six seconds every
30 seconds, repeating for
approximately five minutes or until
safety belt is buckled.
The Belt-Minder feature will not
activate.