Volkswagen Golf Owners Manual: Rain sensor
Fig. 89 Windscreen wiper lever: setting the rain sensor ①
Fig. 90 Sensitive surface of the rain sensor
First read and observe the introductory information
and safety warnings When the rain sensor is activated, it automatically controls the frequency of the wiper intervals, depending on the amount of rain . The sensitivity of the rain sensor can be adjusted manually. Manual wipe .
The automatic wipe function can be activated and deactivated using the
button and the 
and
Mirror and wipers function buttons in the infotainment system .
If the rain sensor deactivated, intervals will be set in levels.
Push the lever to the desired position :
Deactivates the rain sensor. 
Rain sensor is active – automatic wipe
when necessary. 
Adjusting the sensitivity of the rain sensor:
- Switch to the right – high sensitivity.
- Switch to the left – low sensitivity.
The rain sensor will remain active after the ignition is switched off and back on again and will function again if the windscreen wiper lever is in position Ⓑ and if the vehicle is travelling at speeds higher than 4 km/h (2 mph).
Changes to the functioning of the rain sensor
Possible causes for faults and misinterpretations concerning the sensitive surface of the rain sensor include:
- Damaged wiper blades: a film of water or smears caused by damaged wiper blades can increase the time the wipers are switched on, can shorten the length of the intervals between wipes or cause the wipers to run continuously.
- Insects: insects hitting the windscreen surface can cause the wipers to be activated.
- Salt deposits: in winter, salt deposits can cause the wiper to continue to wipe the windscreen when it is almost dry.
- Soiling: dry dust, wax, windscreen coatings (lotus effect) or detergent deposits (automatic car wash) can cause the rain sensor to become less sensitive and react too slowly or even not at all.
- Crack in the windscreen: when the windscreen is impacted by a stone, a wash cycle is triggered if the rain sensor is on. The rain sensor will then register the reduction in sensitivity of the surface and adjust accordingly. The size of the crack could affect the way in which the sensor activates the wipers.
WARNING
- If necessary, switch on the windscreen wiper manually if the water on the windscreen restricts the field of vision.
Clean the sensitive surface of the rain sensor (arrow) at regular intervals and check the wiper blades for damage.
We recommend that you use an alcohol-based glass cleaner to remove wax and polish.
Service position for the front windscreen wipers
Fig. 88 Wiper blades in service position
First read and observe the introductory information
and safety warnings The windscreen wiper arms can be lifted off the windscreen
when in the service ...
Checking and refilling the windscreen washer fluid level
Fig. 91 In the engine compartment: cap
of washer fluid reservoir
First read and observe the introductory information
and safety warnings The windscreen washer fluid level should be checked reg ...
Other materials:
Checking cooling system for leaks
Special tools and workshop equipment
required
Cooling system tester -V.A.G 1274 B-
Adapter for cooling system tester -V.A.G ...
Current draw test
WARNING
It is not permissible to test or charge batteries
whose magic eye shows light yellow. Do not slave/jump
start the vehicle!
Danger of explosion when checking and charging or ...
Contact surface cleaning set -VAS 6410-
Using contact surface cleaning set -VAS 6410-
The contact surface cleaning set -VAS 6410- allows optimal
repair quality to be achieved in the area of vehicle electrics.
The tools allow performing repair work in the area of the sensor
in wiring harnesses for t ...