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If VCDS does not show errors, double check you have the latest VCDS interface for the vehicle year. My RS5 built May 2021 needed the latest VCDS interface to talk to all modules.

Check you are seeing the modules in VCDS for MMI (module 5F), and electric seats, and climate control if separate, based on model year? If the module is not scanned/visible, the error codes will not appear.

Also, check maybe all the fuses (except the very obvious which are not related) in case part of the features are covered by a different fuse.

Your discovery that both driver and passenger seat heating is inoperative suggests something beyonds the seats, such as the control modules mentioned above.

Hope it helps!
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