5 ms·

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

• lmz 24d ago
  You would hope that the ignition switch really cuts the power to the head unit when it is switched to off.
  • carstenhag 24d ago
    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.
    • brookst 24d ago
      That’s why head units stay in low power mode for 30ish minutes when you turn off the car. They do not stay in low power for weeks. Car batteries are really not that big, and cranking an engine takes some amps. I had a Subaru crosstrek that was recalled because their cellular modem was drawing IIRC 10ma 24/7, which would kill the car if it sat 3 or 4 days.
  • toast0 24d ago
    Lots of head units will lose presets when they lose power.