FORD 2013 Edge v.1 - Manual (Page 223)

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
The BLIS
௡ and CTA 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 the headlamp switch is not in the
off position and nighttime darkness is detected.
CTA also sounds a series of tones and a message appears in the
information display indicating a vehicle is coming from the right or left.
CTA works with the reverse sensing system which sounds its own series
of tones; see the Parking Aids chapter.
Driving Aids 223
2013 Edge (edg)
Owners Guide gf, 1st Printing
USA (fus)