Porsche Cayenne 2005 Owner's Manual page 158

Front ultrasound sensors
Sensors
Six ultrasound sensors in the front and rear
bumpers measure the distance to the closest ob-
stacle.
– Range of outer sensors
(front and rear):
approx. 24 in. or 60 cm
– Range of front middle sensors (arrow):
approx. 48 in. or 120 cm
158
Controls, Safety, Instruments
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Rear ultrasound sensors
– Range of rear middle sensors (arrow)
(only in vehicles without spare wheel bracket):
approx. 59 in. or 150 cm
– Range of rear middle sensors
(only in vehicles with spare wheel bracket):
approx. 48 in. or 120 cm
Obstacles cannot be detected in the "blind" sensor
area (above and below the sensors).
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Maintenance note
f The sensors must always be kept free of dust,
ice and snow in order to ensure that they are
fully functional.
f Do not damage sensors by abrasion or
scratching.
f Maintain sufficient distance when cleaning with
steam-jet units.
The sensors will be damaged if the pressure is
too high.
Note on operation
The rear ultrasound sensors may not function
correctly if tires that have not been recommended
by Porsche are fitted on the spare wheel bracket.
If the spare wheel bracket is open, this may impair
the function of the rear ultrasound sensors.
In vehicles that have air suspension with level
control and height adjustment, the system may
not recognise obstacles near the ground at terrain
level or special terrain level.