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Lights and visibility128
Rain sensor*
The rain sensor controls the frequency of the windscreen wiper intervals,
depending on the amount of rain . The sensitivity of the rain sensor can
be adjusted manually. Manual wipe page 125
Move the lever to the required position fig. 75:
Rain sensor off.
Rain sensor on; automatic wipe if necessary.
Setting sensitivity level of rain sensor
Set control to the right: highly sensitive.
Set control to the left: less sensitive.
When the ignition is switched off and then back on, the rain sensor stays on
and starts operating again when the windscreen wipers are in position
and the vehicle is travelling at more than 4 km/h (2 mph).
Rain sensor modified behaviour
Possible causes of faults and mistaken readings on the sensitive surface
fig. 76 of the rain sensor include:
x Damaged blades: A film of water on the damaged blades may lengthen
the activation time, reduce the washing intervals or result in a fast and contin-
uous wipe.
x Insects: insects on the sensor may trigger the windscreen wipers.
x Salt on roads: in winter, salt spread in the roads may cause an extra long
wipe when the windscreen is almost dry.
x Dirt: dry dust, wax, coating on glass (Lotus effect) or traces of detergent
(car wash) may reduce the effectiveness of the rain sensor or make it react
more slowly, later or not at all.
x Cracked windscreen: the impact of a stone will trigger a single wipe cycle
with the rain sensor on. Next the rain sensor detects the reduction in the
sensitive surface area and adapts accordingly. The behaviour of the sensor
will vary with the size of the damage caused by the stone.
WARNING
The rain sensor may not detect enough rain to switch on the wipers.
x If necessary, switch on the wipers manually when water on the wind-
screen obstructs visibility.
Fig. 75 Windscreen wiper
lever: adjusting the rain
sensor .
A
A
Fig. 76 Rain sensor
sensitive surface.
A
0
A
1
A
A
A
1
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