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Rain sensor (fig. 64)
The rain sensor (A), fitted only on cer-
tain versions, is an electronic device com-
bined with the windscreen wiper which
has the purpose of automatically adjusting
the number of wipes during intermittent
operation to the intensity of the rain.
All the other functions controlled by the
right-hand lever remain unchanged.
The rain sensor is activated automatical-
ly moving the right-hand lever to position
(B-fig. 62) and it has a range of adjust-
ment that gradually varies between wiper
stationary (no wiping) when the wind-
screen is dry, to wiper at first continuous
speed (continuous, slow) with heavy rain.
48
fig. 64
Turning the knurled ring (F-fig. 62) it
is possible to increase the sensitivity of the
rain sensor, obtaining a quicker change
from stationary, when the windscreen is
dry, to first continuous speed (continuous,
slow).
Operating the windscreen washer with
the rain sensor activated (lever at position
B) the normal washing cycle is performed
at the end of which the rain sensor
resumes its normal automatic function.
Turning the ignition key to STOP the
rain sensor is deactivated and the next
time the engine is started (MAR posi-
tion) it will not be reactivated even if the
lever has remained in position (B). In this
case to activate the rain sensor, simply
move the lever to (A) or (C) and then
back to (B).
When the rain sensor is reactivated in
this way, the wiper performs at least one
stroke, even if the windscreen is dry, to
A0A0331b
indicate that reactivation has occurred.
The rain sensor is located behind the
inner rear-view mirror in contact with the
windscreen and inside the area cleaned by
the wiper and it controls an electronic con-
trol unit which in turn controls the wiper
motor.
At each start, the rain sensor automati-
cally stabilises at a temperature of about
40°C to eliminate any condensation from
the control surface and prevent the forma-
tion of ice.
The rain sensor is able to detect and
automatically adapt to the presence of the
following particular conditions which
require different sensitivity:
– impurities on the control surface (salt,
dirt, etc.);
– streaks of water caused by worn wiper
blades;
– difference between day and night (the
human eye is more disturbed during the
night by the wet glass surface).
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