Ford 2003 Explorer Owner's Manual page 77

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...
BeltMinder
The BeltMinder 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 5 km/h (3
mph) and 1-2 minutes have
elapsed since the ignition
switch has been turned to
ON...
The driver's safety belt is
buckled for 20 seconds or
longer...
Seating and Safety Restraints
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 BeltMinder 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 safety belt is
buckled.
The BeltMinder feature is re-activated.
77