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Whenever the wipers are set to intermittent, not matter what position the knurled switch is in, the wipers have the same timing between wipes.

I presume the potentiometer is faulty, where is it and how do I change it, or is something else causing the problem?

Thanks

Graham
 

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Intermittent mode

A knurled wheel with a potentiometer is integrated in the wiper switch. This makes it possible to set four different intervals. These times are also controlled according to road speed. The faster the vehicle is driven, the shorter the interval.

On vehicles equipped with automatic interval control (AIC) (as of March 1996), the sensitivity of the rain sensor can be influenced with the thumb wheel.

http://www.meeknet.co.uk/E38/E38_Wiper_Washer_System.pdf
 

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....or, if you have rain sensing wipers, the sensor module attached to the windscreen is broken (reasonably common I think)
 
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