Ford F-150 Owner's Manual page 144

Seating and Safety Restraints
Sitting improperly out of position or with the seat back reclined
too far can take off weight from the seat cushion and affect the
decision of the front passenger sensing system, resulting in serious
injury or death in a crash.
Always sit upright against your seatback, with your feet on the floor.
The front passenger sensing system may detect small or medium objects
placed on the seat cushion. For most objects that are in the front
passenger seat, the passenger airbag will be disabled. Even though the
passenger airbag is disabled, the pass airbag off lamp may or may not
be illuminated according to the table below.
Objects
Small (i.e. 3 ring
binder, small purse,
bottled water)
Medium (i.e. heavy
briefcase, fully packed
luggage)
Empty seat, Small or
medium object with
safety belt buckled
In case there is a problem with the
front passenger sensing system, the
airbag readiness lamp in the
instrument cluster will stay lit.
DO NOT attempt to repair or service the system; take your vehicle
immediately to an authorized dealer.
The front passenger airbag is not designed to offer protection to
an occupant in the center seating position.
An out of position front center occupant could affect the
decision of the front passenger sensing system.
144
2006 F-150 (f12)
Owners Guide (post-2002-fmt)
USA (fus)
Pass Airbag Off
Indicator Lamp
Unlit
Lit
Lit
Passenger Airbag
Disabled
Disabled
Disabled