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No communication at diagnostic port

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No communication at diagnostic port

Old 04-30-2019, 10:56 AM
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Default No communication at diagnostic port

I have a 2004 TT convertible with 3.2l. Car runs and drives well but I cannot get communication at diagnostic port. I have power and ground to port but fail to link and know the scanner is good. I also notice there is no illumination of check engine light at all when key is first on. I have disconnected many of the modules including the Comfort control module and am down to the haldex controller which will be next as weather allows. I have checked all fuses and they are fine. I know there are some relays under the knee panel but am unsure if any of those could cause the issue I am having. Am wondering if anyone can steer me in the right direction?
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