Headlight Washers - Alfa Romeo 156 GTA Owner's Manual

When the rain sensor is reactivated, the
wiper performs one stroke, even if the wind-
screen is dry, to indicate that reactivation
has occurred.
IMPORTANT In case of failure of the
right-hand 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 wind-
screen 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 con-
trol surface and prevent the formation of ice.
The rain sensor is able to detect and au-
tomatically adapt to the presence of the fol-
lowing 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. 74)
These are operated when the sidelights are
on and the windscreen washer is switched
on.
fig. 74
A0B0379m
51