Polo 6n2 no response from controller

Hi everyone!

first of all, I'd like to say that I've read the forum many times, but this is my first post. I don't know if I should introduce myself first, but I couldn't find the section.

well, for a few days it has been impossible for me to connect to the car via obd, with cables that used to work.  i have tried with a kkl cable with versions 311 and 409, i have tried a clone of a hex-v2 that works perfectly on my passat b7.

and the only thing I get is that when entering any module the automatic headlight levelers start to work but I always get the same error, in any module “Not response from controler”

every time I scan modules such as the airbag or abs or engine, the lights flash on the panel but nothing else happens.

I have tried almost everything I saw on the internet and in no case did it work for me, I have read almost all the posts I see with similar problems and I can't find anything...

things I have tried:

-disconnect the battery for a whole night

-join the battery terminals

-close the car and disconnect the battery

-I have removed the radio in case it was sending interference to the k line

-I have disconnected the power stage and subwoofer

-I have disconnected the ecu, comfort, real estate and abs control units and I have given it contact cleaner in case it was a bad connection

-I have disconnected the panel and I check that I get continuity from pin 7 of the obd to pin number 25 of the blue connector of the cluster

-check that I get 12v to pin 16 of the obd, check all the fuses

-in pins 19 and 20 of the green connector of the panel I get a 60ohm resistance

-between pins 7 and 4 of the obd I get 10v and when I put a 1k resistor It goes down to 6v but the resistance does not heat up

-I have tried to change the cluster because someone told me that it could be from the gateway and I think that in the car the cluster acts as a gateway

- I have verified with an oscilloscope that between pins 19 and 20 there are positive and negative voltage signals when making contact, but I do not understand this much nor do I know how to use an oscilloscope

and I don't know what else, the truth is that the car is driving me crazy, and even more so when I have no idea where the fault could be, surely it is the dumbest thing that could have happened to me but it is that my head It no longer works after thinking about it so much, and for pressure, next week I had planned to go to the nurburgring on my vacation but every day that passes I see it more difficult and that makes me in a very bad mood

sorry for so much text but I don't know what else to do

greetings and thanks