hmi

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...

I reverse polaritied my car with the battery, and now I have quite the issues to deal with. For starters, the infotainment system stopped working. IO ave gotten an entire new refurbished cue system, but I feel like I might need a new reprogramed HMI, another issue is the power steering is not...