Most manufacturers are installing firewalls in 2018+ vehicles, so even if someone hacked the headunit, even in drive by wire systems it shouldn't be able to con

Most manufacturers are installing firewalls in 2018+ vehicles, so even if someone hacked the headunit, even in drive by wire systems it shouldn't be able to control your accelerator, transmission, parking brake, steering, etc. With the past few years of vehicle hacking and the automakers being embarrassed, they have started to take Bus security extremely seriously. In my opinion, with full display gauge clusters becoming popular, the entertainment and vehicle operation busses should be completely separate (including unique J1962 interfaces for each). Any software driven driver options should be controlled via the gauge cluster display instead of the entertainment system. That way, it's nearly impossible for a head unit hack to affect vehicle safety and control ECUs.