Alfa Romeo Giulia 2017 Owner's Manual page 45

Activation
Rotating the wiper switch to position
or activates the rain sensor.
The activation of the rain sensor system
is done by tapping the wiper stalk
upwards while the switch is in the
position.
The variation in sensitivity during rain
sensor operation is also signaled by a
stroke of the wiper (command acquired
and implemented). This stroke is also
executed with the windshield dry.
If the windshield washer is used with
the rain sensor activated, the normal
washing cycle is performed, after which
the rain sensor resumes its normal
automatic operation.
Note: Keep the glass in the sensor
area clean.
Deactivation
Use the wiper switch or cycle the
ignition to STOP.
If the ignition is cycled to the STOP
position and the wiper switch is left in
or position, no wiping cycle will
occur even if it rains when the vehicle is
next started (ignition at ON).
This prevents accidental activation of
or
the rain sensor when the engine is
started (e.g. when the windshield is
being washed by hand or the wipers
are stuck to the windshield by ice).
You can restore the automatic
functioning of the rain sensor by
tapping the wiper stalk upwards once
the vehicle has been restarted.
When the rain sensor is reactivated
using any of the functions described
above, reactivation is indicated by a
single tap of the windshield wipers,
regardless of the condition of the
windshield.
In the event of malfunction of the rain
sensor while it is active, the windshield
wiper operates intermittently at a speed
consistent with the sensitivity setting of
the rain sensor, whether or not there is
rain on the glass for as long as the sensor
failure is indicated on the display.
The sensor continues to operate and it
is possible to set the windshield wiper
to continuous mode or . The
failure indication remains on for as long
as the sensor is active.
The rain sensor is able to recognize and
automatically adjust itself in the
presence of the following conditions:
Presence of dirt on the controlled
surface (e.g. salt, dirt, etc.).
Presence of streaks of water caused
by the worn window wiper blades.
Difference between day and night.
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