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Your in-car software's architecture should by no means put "the part that is critical to driving the car safely" and "the part that runs the entertainment system and heated seats" anywhere near each other.

If they are, your design is braindead and unsafe.

If they are properly separated, modifying heated seats is a non-issue.

If the software that's deciding whether or not you're allowed to heat your seats can connect in any way whatsoever to safety-critical systems in your car, you have bigger problems than running "hacked together software".

You know people are allowed to work on their own cars right? Including wheels and brakes? And there are a lot of states that don't even require an inspection. You share the road with so many shoddy death traps as is

I want cars to be disconnected from the internet in the first place, since there is much higher risk being hacked in the middle of highway.