They are always wired to battery power though. The point is that it could look powered off, and still be running a proxy.

You would hope that the ignition switch really cuts the power to the head unit when it is switched to off.

	▲	carstenhag 2 hours ago \| parent [-]
		No you wouldn’t, because then you always have a cold boot of the headunit, even if you just accidentally hit the ignition. Users want the head unit to resume within a few seconds. Just like their phone.