Ferrari California Owner's Manual page 135

The parking system sensors in the bumpers are automatically
activated with the key in position II (Ignition) when the reverse
gear is engaged.
The rear sensors are also an aid when opening and closing the
retractable hard top and reduce the risk of hitting obstacles placed
behind the vehicle.
Important note
If distance B (see page 111) is less than 400 mm, the parking
sensors will not allow the top to be opened or closed the 1
time the switch is pressed.
When the vehicle is also equipped with front sensors, only the rear
sensors or front sensors can be activated/deactivated using the TFT
display menu.
When the rear sensors are activated, an acoustic signal warns the
driver that the system has been activated.
The system then starts to emit acoustic signals as soon as an
obstacle is detected which become more frequent as the obstacle
approaches.
When the obstacles is at a distance of less than 35 cm from
the bumper, a continuous sound is emitted and the relevant
area becomes red on the TFT display (minimum distance, see
page 136).
The acoustic signal stops immediately if the distance from the
obstacle increases.
The tone cycle remains constant if the measured distance from the
central sensors remains unchanged.
The TFT display indicates the vehicle symbol and the sensor
detection zones.
The detection zones indicate which part of the vehicle is
approaching an obstacle (front/rear and left, right or central) and at
what distance away it is (maximum, medium, minimum).
st
If an obstacle is detected at maximum distance in the central front
part, it will be displayed as shown (green):
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