Ford F-150 2010 Owner's Manual page 172

Seating and Safety Restraints
If the belt has been disconnected to carry large objects behind the seat,
reconnect it as follows:
• Buckle the small tongue on the
end of the belt into the
mini-buckle on the driver's side.
The belt is now ready for use.
This mini-buckle should stay
buckled at all times unless
cargo-carrying makes it necessary
to detach the belt.
Safety belt with cinch tongue (Regular Cab center only)
The cinch tongue will slide up and down the belt webbing when the belt
is stowed or while putting safety belts on. When the lap/shoulder safety
belt is buckled, the cinch tongue will allow the lap portion to be
shortened, but pinches the webbing to keep the lap portion from getting
longer. The cinch tongue is designed to slip during a crash, so always
wear the shoulder belt properly and don't allow any slack in either the
lap or shoulder portions.
Before you can reach and latch a combination lap and shoulder belt
having a cinch tongue into the buckle, you may have to lengthen the lap
belt portion of it.
1. To lengthen the lap belt, pull
some webbing out of the shoulder
belt retractor.
2. While holding the webbing below
the tongue, grasp the tip (metal
portion) of the tongue so that it is
parallel to the webbing and slide the
tongue upward.
3. Provide enough lap belt length so that the tongue can reach the
buckle.
How to fasten the cinch tongue (Regular Cab center only)
1. Pull the combination lap and shoulder belt from the retractor so that
the shoulder belt portion of the safety belt crosses your shoulder and
chest.
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