5 ms·
If the car is able to disconnect it's starter battery, and can start up and run just fine after a disconnect, why does it need to be powered up at all when the
by olyjohn 4y ago
If the car is able to disconnect it's starter battery, and can start up and run just fine after a disconnect, why does it need to be powered up at all when the car is off? What's so important for the car to do, that it can sit there draining the battery, but still be happy to completely disconnect the electrical system to preserve a startup?
- tsimionescu 4y agoAt a minimum and at its most benign, it has to power sensors to detect key commands when you get near it, or functions like keeping the headlights on for a while after you lock it (usually branded "follow me home" or similar). There are probably more debatable things like checking for OTA updates or sending sensor data to some online services.
- yardie 4y agoMostly driver convenience. I drive a mid-tier VW with infotainment, power seats, satellite navigation, etc. If I don't drive the car after a few days it takes a few minutes for the car to fully boot up. No radio, GPS, climate control goes full blast, and it won't know what my power seat settings are. Now imagine having to do that every time you pull the key out, run in the supermarket, and go back to the car. We're demanding a lot from the car battery lately and the BMS needs to know where it stands.