001-055 Alfa 156 GB - Alfa Romeo serviss

GETTING TO KNOW YOUR CAR
52
When the rain sensor is reactivated, the
wiper performs at least one stroke, even if
the windscreen is dry, to indicate that reactivation
has occurred.
WARNING In case of failure of the righthand
stroke or rain sensor, windscreen wiper
operation with the right-hand lever at (B)
shall take place in intermittent mode.
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 control
unit which in turns controls the wiper motor.
At each start, the rain sensor automatically
stabilises at a temperature of about 40°C
to eliminate any condensation from the control
surface and prevent the formation 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).
Headlight washers (fig. 78)
(optional for versions/markets
where applicable)
These are operated when the sidelights
are on and the windscreen washer is
switched on.
fig. 78
A0B0581m