Porsche 911 Carrera Owner's Manual page 161

The rain sensor remains switched off if the wiper
lever is already in position 1 when the ignition is
switched on.
To switch the rain sensor on again:
Move wiper lever to position 0 and then to
position 1 or
Operate windshield washer system 5 or
Change the sensitivity of the rain sensor with
four-stage switch A.
Switch-on is confirmed by one wipe of the wind-
shield.
On vehicles with the Sport Chrono Package Plus,
further rain sensor functions can be selected via
the PCM.
Please observe the chapter "Individual
Memory" in the separate PCM operating
instructions.
Changing the sensitivity of the rain sensor
Sensitivity can be set with switch A in 4 stages:
Adjust switch A upwards - high sensitivity.
The setting is confirmed by one wipe of the
windshield.
Adjust switch A downwards - low sensitivity.
Maintenance note
Periodically clean the wiper blades with a win-
dow cleaner, especially after the vehicle has
been washed in a car wash. We recommend
Porsche window cleaner. If they are very dirty
(e.g. with insect remains), they can be cleaned
with a sponge or cloth.
If the wiper blades rub or squeak, this may be as a
result of the following:
If the vehicle is washed in an automatic car wash,
wax residues may be adhering to the windshield.
These wax residues can only be removed by using
a special cleaning solution.
Please observe the chapter "WASHER FLUID"
on page 250.
Please contact your authorized Porsche dealer for
further information.
The wiper blades may be damaged.
Replace wiper blades as soon as possible.
159
Controls, Instruments