Maserati GranTurismo Coupe Owner's Manual page 39

WARNING: When cleaning the sensors,
take special care not to scratch or
damage them. Do not use dry, rough
or hard cloths. The sensors must be
washed with clean water, possibly with
car shampoo added. In car-washes
which use steam jet or high pressure
cleaning machines, keep the nozzle at
least 4 in (10 cm) away from the
sensors.
Sensor range
The sensors allow the system to
monitor the rear of the vehicle; in fact,
their position covers the central and
lateral zones at the rear of the vehicle.
If there is an object located in the
central zone, it will be detected at
distances of less than 1.64 yd (1.50 m).
If the obstacle is located in a lateral
position, it will be detected at
distances of less than 24 in (0.6 m).
Parking sensors (optional)
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