Ford 2013 Fusion Owner's Manual page 202

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Zone coverage also decreases when
parking at shallow angles. Here, the left
sensor is mostly obstructed; zone coverage
on that side is severely limited.
System Lights and Messages
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The BLIS and cross traffic alert systems
illuminate a yellow alert indicator in the
outside mirror on the side of the vehicle
the approaching vehicle is coming from.
Note: The alert indicator dims when
nighttime darkness is detected.
Fusion/Mondeo (CC7)
Driving Aids
Cross traffic alert also sounds an audible
warning and a message appears in the
information display indicating a vehicle is
coming from the right or left. Cross traffic
alert works with the reverse sensing
system which sounds its own series of
tones. See Parking Aid (page 177).
System Sensors
Just prior to the system recognizing
a blocked condition and alerting the
driver, the number of missed objects
will increase. To help avoid injuries, NEVER
use the BLIS as a replacement for using
the side and rear view mirrors and looking
over your shoulder before changing lanes.
BLIS is not a replacement for careful
driving and only an assist.
Note: It is possible to get a blockage
warning with no blockage present; this is
rare and known as a false blockage warning.
A false blocked condition either
self-corrects or clears after a key cycle.
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WARNING