Ford F-150 2021 Supplemental Owner's Manual page 28

You and the front seat passenger buckle
your seatbelts before you switch the igni-
tion on or less than 1–2 minutes elapse after
you switch the ignition on...
You or the front seat passenger do not
buckle your seatbelts before your vehicle
reaches at least 6.0 mph (9.7 km/h) and
1–2 minutes elapse after you switch the
ignition on...
The seatbelt for the driver or front
passenger is unbuckled for about 1 minute
while the vehicle is traveling at least
6.0 mph (9.7 km/h) and more than 1–2
minutes elapse after you switch the ignition
on...
F-150 (TFD) Canada/United States of America, enUSA, Edition date: 202008, First-Printing
Seatbelts
If
The Belt-Minder feature will not activate.
The Belt-Minder feature activates, the
seatbelt warning lamp illuminates and an
indicator tone sounds for 6 seconds every
25 seconds, repeating for about 5 minutes
or until you and the front seat passenger
buckle your seatbelts.
The Belt-Minder feature activates, the
seatbelt warning lamp illuminates and an
indicator tone sounds for 6 seconds every
25 seconds, repeating for about 5 minutes
or until you and the front seat passenger
buckle your seatbelts.
25
Then