Cayenne S 2008 Pin 34 of level control ( shortage )

[MR.WHO]

Dears,

 

i have an error 1772 on my Porsche Cayenne S 2008 since 2 months and i'm not riding the car.

i already replace compressor + valve block + level control unit in the back

but the problem was not of all

After i say a PDF that describes how to diagnose the problem, i found that the Pin 34 of Connector A was shorted to B+

it supposes to give me <0.3 V buti have 4.2V ~ 7.7V !!!!

i was searching hard to know where is the path of this pin and as per some diagram on internet, it says that it connected directly to Pin 8 of valve block connector.

but it was not !!! i measure the voltage from the VB conn. it was <0.3V !!!!

i cut the line 34 and i connect it directly from CU pin 34 to Pin 8

i got error 1773 which is talk about Pin 34 ?

can anyone help on this ? or provide me with the correct diagram if I was wrong?

 

Thank you all