Ford Expedition Owner's Manual page 186

Seating and Safety Restraints
Conditions of operation
If...
The driver safety belt is not
buckled before the ignition
switch is turned to the ON
position...
The driver safety belt is
buckled while the indicator
light is illuminated and the
warning chime is sounding...
The driver 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.
When the Belt-Minder feature is activated, the safety belt warning light
illuminates and the warning chime sounds for 6 seconds every 30
seconds, repeating for approximately 5 minutes or until the safety belts
are buckled.
The Belt-Minder feature uses two different warning chimes. During the
first minute of activation, the warning chime will sound once every
second. The remaining warning chimes will sound twice every second
while the system is activated.
186
2007 Expedition (exd)
Owners Guide (post-2002-fmt)
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.