FORD 2003 Explorer v.1 - Manual (Page 109)

Do not use extensions to change the fit of the shoulder belt
across the torso.
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... Then...
The driver’s safety belt is not
buckled before the ignition switch
is turned to the ON position... The safety belt warning light
illuminates 1-2 minutes and the
warning chime sounds 4-8
seconds.
The driver’s safety belt is buckled
while the indicator light is
illuminated and the warning chime
is sounding... The safety belt warning light and
warning chime turn off.
The driver’s safety belt is buckled
before the ignition switch is turned
to the ON position... The safety belt warning light and
indicator chime remain off.
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.
Seating and Safety Restraints
109