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  1. HVAC not working (after HMI upgrade) 2016 CTS 2.0

    2014+ Cadillac CTS General Discussion
    My dad purchased a 2016 CTS 2.0 and we pulled the HMI and radio module to upgrade to newest software and get Norwegian language. After re-installing the symbol for climate is greyed out on the head unit. When I press it the following message is shown: "System communications error A...