Ford 2009 Mustang Owner's Manual page 116

Seating and Safety Restraints
Reasons given...
"I have an airbag"
"I'd rather be thrown clear"
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 air bag
system.
One-time disable
If at any time the driver/front passenger quickly buckles then unbuckles
the safety belt for that seating position, the Belt-Minder is disabled for
the current ignition cycle. The Belt-Minder feature will enable during
the same ignition cycle if the occupant buckles and remains buckled for
approximately 30 seconds. Confirmation is not given for the one time
disable.
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: The driver and front passenger Belt-Minder features must be
disabled/enabled separately. Both cannot be disable/enabled during the
same key cycle.
116
2009 05+ Mustang (197)
Owners Guide
USA (fus)
Consider...
Airbags offer greater protection when
used with safety belts. Frontal airbags
are not designed to inflate in rear and
side crashes or rollovers.
Not a good idea. People who are
ejected are 40 times more likely
to DIE. Safety belts help prevent
ejection, WE CAN'T "PICK OUR
CRASH".