FORD 2009 F-150 v.2 - Manual (Page 169)

While you are fastened in the safety belt, the combination lap/shoulder
belt with a cinch tongue adjusts to your movement. However, if you
brake hard, turn hard, or if your vehicle receives an impact of 5 mph
(8 km/h) or more, the safety belt will become locked and help reduce
your forward movement.
Lap belts
Adjusting the lap belt
(Front center seat position SuperCab and CrewCab only)
WARNING: The lap belt should fit snugly and as low as possible
around the hips, not across the waist.
The front center lap belt tongue is designed to fit only in the correct
buckle. The tongue will not securely latch if you attempt to use it in any
of the outboard seating position buckles. To ensure that you have used
the correct buckle you should hear a snap and feel it latch.
• Front center lap belt
The lap belt does not adjust automatically.
Insert the tongue into the correct
buckle (the buckle closest to the
direction the tongue is coming
from). To lengthen the belt, turn the
tongue at a right angle to the belt
and pull across your lap until it
reaches the buckle. To tighten the
belt, pull the loose end of the belt
through the tongue until it fits
snugly across the hips.
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Seating and Safety Restraints
169