Ford 2010 F-150 Owner's Manual page 181

WARNING: Do not sit on top of a buckled safety belt or insert a
latchplate into the buckle to avoid the Belt-Minder chime. To
do so may adversely affect the performance of the vehicle's airbag
system.
Deactivating/activating the Belt-Minder feature
The driver and front passenger Belt-Minder are
deactivated/activated independently. When deactivating/activating
one seating position, do not buckle the other position as this will
terminate the process.
Read Steps 1 - 4 thoroughly before proceeding with the
deactivation/activation programming procedure.
Note: If you are using MyKey™, the Belt-Minder cannot be disabled.
Also, if the Belt-Minder has been previously disabled, it will be
re-enabled after the use of MyKey™. Refer to MyKey™ in the Locks
and security chapter.
The driver and front passenger Belt-Minder features can be
deactivated/activated by performing the following procedure:
Before following the procedure, make sure that:
• The parking brake is set
• The gearshift is in P (Park)
• The ignition switch is in the off position
• The driver and front passenger safety belts are unbuckled
WARNING: While the design allows you to deactivate your
Belt-Minder , this system is designed to improve your chances of
being safely belted and surviving an accident. We recommend you
leave the Belt-Minder system activated for yourself and others who
may use the vehicle. To reduce the risk of injury, do not
deactivate/activate the Belt-Minder feature while driving the vehicle.
1. Turn the ignition switch to the on position. DO NOT START THE
ENGINE.
2010 F-150 (f12)
Owners Guide, 1st Printing
USA (fus)
Seating and Safety Restraints
181