I'd be looking at the battery and it's connections. the headlight idea is a good place to start, then Pep Boys, Autozone, or one of them, will do a reserve test on it for free. You don't have to take the car, just the battery. You could also try jumping it with your car.
The electrical architecture on newer cars is a nightmare. When they started running signals on the same wire as power it became infinitely more difficult. Every car I've owned I've bought the factory repair manual, but starting with the Chevy manual for my 2006, half the diagnostics say hook up the dealers computer, that costs damn near as much as the car, and walk through these steps. So after this muti-grand computer beeps and whirrs, and bops, it's says, check for a loose gas cap. WTF, couldn't you just tell me that up front?
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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