Rain sensor

[cosmo black]

Hello to all I do not know if you know that our dear astra j has a spy for the automatic wipers that only works on the first astra j.
To me it does not work and now I incocciato I want to make it work ...
So the first thing I put 2 SMD LED in the instrument without connecting them to the instrument ....
So the first thing I try to remove the detrimental wipers and check whether putting the lever of rain sensor if one of the pin generate a fixed voltage to the sensor.
But the only pin that I have noticed signs of life when I set the lever to the first position to activate the rain sensor virtually passes from 10v to 2.70 v when the sensor is active and if I set the sensitivity of the sensor to masimo down to 0.70v.
While everyone else is always + 12v
I have also seen close to 3 pin arriving at the sensor but no dice there is a + 12v fixed a -12V and + 7V ...
Does anyone know how I can help find any tension when the lever is set to rain sensor