FORD 2002 F-550 v.3 - Manual (Page 145)

The RSS will assist the driver in detecting certain objects while the
vehicle slowly moves in reverse at speeds less than 6 km/h (4 mph). The
RSS is not effective at speeds greater than 6 km/h (4 mph) and may not
detect certain angular or moving objects.
The reverse sensing system detects
obstacles within approximately 1.8
meters (5.9 ft.) of the rear bumper
with a decreased coverage area at
the outer corners of the bumper,
(refer to the figures for approximate
zone coverage areas). As you move
closer to the obstacle, the rate of
the tone increases. When the
distance to the obstacle is less than
25.0 cm (10 in.), the tone will sound
continuously. If the system detects a
stationary or receding object further
than 25.0 cm (10 in.) from the side
of the vehicle, the tone will sound
for only three seconds. Once the
system detects an object
approaching, the tone will sound
again.
The reverse sensing system is
automatically enabled when the gear
selector is placed in R (Reverse)
and the ignition is ON. A reverse
sensing control allows the driver to
disable the reverse sensing system only when the ignition is ON, and the
gear selector is in R (Reverse).
The OFF indicator remains illuminated when the system is disabled. The
system defaults to ON every time the reverse gear is selected. Press the
control to disable or enable the system.
The indicator will remain illuminated to indicate a failure of the reverse
sensing system.
The reverse sensing system may have reduced performance or an
increased chance of false detection if the tailgate is not locked in the
vertical position. When the tailgate is down, the driver may experience a
OFF
Driving
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