FORD 2013 Edge v.4 - Manual (Page 229)

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.
228 Driving Aids
2013 Edge (edg)
Owners Guide gf, 4th Printing, November 2012
USA (fus)