FORD 2002 Ranger v.1 - Manual (Page 129)

If the light fails to illuminate when the passenger air bag switch
is in the OFF position and the ignition switch is in ON, have the
passenger air bag switch serviced at your Ford or Lincoln-Mercury
dealer immediately.
In order to avoid inadvertent activation of the switch, always
remove the ignition key from the passenger air bag ON/OFF
switch.
Turning the passenger air bag back on
The passenger air bag remains OFF until you turn it back ON.
1. Insert the ignition key and turn
the switch to ON.
2. The OFF light will briefly
illuminate when the ignition is
turned to ON. This indicates that
the passenger air bag is operational.
If the OFF light is illuminated when the passenger air bag
ON/OFF switch is in the ON position and the ignition switch is
ON, have the passenger air bag ON/OFF switch serviced at your Ford
or Lincoln-Mercury dealer immediately.
The passenger side air bag should always be ON (the air bag OFF light
should not be illuminated) unless the passenger is a person who meets
the requirements stated either in Category 1, 2 or 3 of the
NHTSA/Transport Canada deactivation criteria which follows.
ON
OFF
OFF
PASSENGER AIRBAG
Seating and Safety Restraints
129