I am happy to say that it has fixed the problem. Thank you very much exe! 
Beiträge von djukicuros
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Check the connection of the ECC plugs. The CAN bus data lines are going to the radio and to the GID.
I have checked connections. Radio and ECC what ok. However connection to GID was maybe 2mm out in upper part. I pushed it inside and now everything works. I will get back here in couple of days with info if it still works or not. I hope this was the problem.
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Is the radio still working and showing data on the GID when the ECC data is gone?
Radio is working and showing data even when ECC data is gone. Sometimes there is no ECC data on GID and air con works. Sometimes not. ECC unit sometimes even has no lights.
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I hate to do this as the subject is from 2012, but I have same issue as original poster. ECC sometimes works but no info on GID. Sometimes GID shows ECC info. Sometimes ECC doesn't work. So I have all possible combinations. I have tried to change ECC unit but it didn't help.
Can anyone help?
Sorry this is not in German, but this is only place online that I have found person with the same problem.
Please help!!!