Volkswagen Golf GTI 2016, Руководство пользователя

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Rain sensor off (windshield wiper lever home position).
Rain sensor active – automatic wiping as needed.
Adjust the sensitivity of the rain sensor:
- Move switch to the right – high sensitivity.
- Move switch to the left – low sensitivity.
After switching the ignition off and back on again, the rain sensor
stays on and works again when the wiper lever is in position Ⓑ.
Possible reasons for changes in the way the rain sensor works
The rain sensor may misread what is happening in the detection
zone of its sensitive rain-sensor surface → Fig. 92 (arrow) and not
work for a number of reasons, which may include:
Worn out wiper blades: Worn out wiper blades may leave a film of
water or wiping streaks; this can cause the wipers to run longer,
to wipe more often, or to wipe continuously at high speed.
Insects: Insects hitting the windshield may trigger the wipers.
Salt streaks: Salt streaks on the windshield from winter driving
can cause wiping more often or continuously on glass that is
almost dry.
Dirt: Caked-on dust, wax, any other buildup on the windshield