Punto wiper mod- help

I just bought a rear wiper from a fiat punto and I fitted to my N15, but I want to reverse the movement of it because now it will move down. There are four cables on the n15 plug. Does anyone know how to reverse them?
 
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telling you would kind of defeat the object of having to pay for membership, but basically you take the motor apart and alter the location of one of the arms
 
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