FORD 2009 Expedition v.1 - Manual (Page 310)

When towing, the reverse camera system will only see what is being
towed behind the vehicle; this might not provide adequate coverage as it
usually provides in normal operation and some objects might not be
seen.
The camera lens for the reverse camera system is located on the liftgate,
above the license plate. Keep the lens clean so the video image remains
clear and undistorted. Clean the lens with a soft, lint-free cloth and
non-abrasive cleaner.
Note: If the reverse camera system image is not clear or seems
distorted, it may be covered with water droplets, snow, mud or any other
substance. If this occurs, clean the camera lens before using the reverse
camera system.
WARNING: The reverse camera system is a reverse aid
supplement device that still requires the driver to use it in
conjunction with the rear view mirror and the side mirrors for
maximum coverage.
WARNING: Objects that are close to either corner of the
bumper or under the bumper, might not be seen on the screen
due to the limited coverage of the reverse camera system.
WARNING: Backup as slow as possible since higher speeds
might limit your reaction time to stop the vehicle.
WARNING: Do not use the reverse camera system with the
liftgate open.
If the back end of the vehicle is hit or damaged, then check with your
authorized dealer to have your rear video system checked for proper
coverage and operation.
Night time and dark area use
At night time or in dark areas, the reverse camera system relies on the
reverse lamp lighting to produce an image. Therefore it is necessary that
both reverse lamps are operating in order to get a clear image in the
dark. If either of the lamps are not operating, stop using the reverse
camera system, at least in the dark, until the lamp(s) are replaced and
functioning.
2009 Expedition (exd)
Owners Guide, 1st Printing
USA (fus)
Driving
310