FORD 2010 F-550 v.1 - Manual (Page 174)

2. To unfasten, push the release
button and remove the tongue from
the buckle.
Vehicle sensitive mode
Combination lap and shoulder belts in normal retractor mode allow free
shoulder belt length adjustment to your movements and locking in
response to vehicle movement. For example, if the driver brakes
suddenly or turns a corner sharply, or the vehicle receives an impact of
approximately 5 mph (8 km/h) or more, the combination safety belts will
lock to help reduce forward movement of the driver and passengers.
Belt sensitive mode
Combination lap and shoulder belts can also be made to lock manually by
quickly pulling on the shoulder belt.
Automatic locking mode
When to use the automatic locking mode
In this mode, the shoulder belt is automatically pre-locked. The belt will
still retract to remove any slack in the shoulder belt. The automatic
locking mode is not available on the driver safety belt.
This mode should be used any time a child safety seat (except a
booster) is installed in a passenger front or outboard rear seating
position (if equipped). Children 12 years old and under should be
properly restrained in the rear seat whenever possible. Refer to Safety
restraints for children or Safety seats for children later in this chapter.
Seating and Safety Restraints
174
2010 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)