FORD 2011 F-550 v.4 - Manual (Page 294)

sensors with sharp objects). If the sensors are covered, it will
affect the accuracy of the RSS.
If your vehicle sustains damage to the rear bumper/fascia, leaving
it misaligned or bent, the sensing zone may be altered causing
inaccurate measurement of obstacles or false alarms.
REARVIEW CAMERA SYSTEM (IF EQUIPPED)
The rearview camera system,
located on the tailgate, provides a
video image, which appears in the
rearview mirror or on the navigation
screen (if equipped), of the area
behind the vehicle. It adds
assistance to the driver while
reversing or reverse parking the
vehicle.
To use the camera system, place the transmission in R (Reverse); an
image will display on the left portion of the rearview mirror or on the
navigation screen (if equipped). The area displayed on the screen may
vary according to the vehicle orientation and/or road condition.
Driving
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2011 F-250/350/450/550 (f23)
Owners Guide, 4th Printing
USA (fus)