FORD 2012 Focus v.2 - Manual (Page 290)

For best performance, drive the vehicle as parallel as possible while
passing a parking space. If driven too fast (above 18 mph [30 km/h]) for
the system to measure parking spaces, the information display will show
a corresponding message.
When the system has found a space, the information display will show a
corresponding message followed by a chime. Drive forward until the
information display shows a corresponding message followed by a chime.
When you stop the vehicle in position to begin parking, the information
display will show a corresponding message. The driver should always
come to a complete stop before changing gears.
Automatic steering into parking space
Automatic steering is activated when you stop the vehicle, remove your
hands from the steering wheel and select the R (Reverse) gear. Be sure
the steering wheel motion is not obstructed by any objects. The vehicle
will steer itself from this point on as you follow the instructions on the
information display to safely move the vehicle reverse and forward in the
space. You may cancel APA at any time by grabbing the steering wheel
or by pressing the APA control switch.
Driving
290
2012 Focus (foc)
Owners Guide, 2nd Printing
USA (fus)