FORD 2012 Focus v.4 - Manual (Page 281)

FORWARD AND REVERSE SENSING SYSTEMS (IF EQUIPPED)
The forward and reverse sensing system will warn the driver of obstacles
within a certain range of the front and rear bumpers.
The front sensors will be active
when the gearshift is in any position
other than P (Park) or N (Neutral)
and the vehicle speed is below
6 mph (10 km/h). The rear sensors
will only be active when the
gearshift is in R (Reverse).
The front sensors cover an area up
to 27.6 inches (70 cm) from the
front of the vehicle and about
6–14 inches (15–35 cm) to the side
of the front end of the vehicle. See
the illustration for approximate
sensor area coverage.
Driving
281
2012 Focus (foc)
Owners Guide, 4th Printing
USA (fus)