FORD 2011 F-150 v.1 - Manual (Page 218)

The passenger seats of your vehicle are equipped with built-in tether
strap anchors located behind the seats as described below.
The tether anchors in your vehicle may be loops of webbing above the
seatback or an anchor bracket behind the seat on the rear edge of the
seat cushion.
The rear seat in the SuperCab and SuperCrew has three straps along the
top of the seatback that function as both routing loops for the tether
straps and anchor loops.
The tether strap anchors in your vehicle are in the following positions
(shown from top view):
• F150 Regular Cab
• F150 SuperCrew and SuperCab
Attach the tether strap only to the appropriate tether anchor as shown.
The tether strap may not work properly if attached somewhere other
than the correct tether anchor.
If you install a child seat with rigid LATCH attachments, do not tighten
the tether strap enough to lift the child seat off the vehicle seat cushion
when the child is seated in it. Keep the tether strap just snug without
lifting the front of the child seat. Keeping the child seat just touching the
vehicle seat gives the best protection in a severe crash.
Seating and Safety Restraints
218
2011 F-150 (f12)
Owners Guide, 1st Printing
USA (fus)