Imagine The Walking Dead started in 50 years from now. The way things are going now, picture this scenario:
>A survivor is walking down a lonesome road.
>They arive at a small resort and there’s a car covered in dust and dirt in the parking lot.
>They approach the car and check whether it still has some bio fuel left in the tank.
>Still plenty.
>They look around spotting a decayed body close by.
>They search the body and are lucky to find a ‘keyless’ key belonging to the car.
>There are no door handles and the battery inside the key corroded away.
>They break the glass and open the door from the inside.
>Finally inside, there’s still no way to start the engine without the key.
>They have an idea.
>The digital wrist watch on the body should have the same battery as the key.
>After a bit of tinkering with some tools they get the key working again.
>They press the ignition button.
>The displays light up but the engine remains quiet.
>The displays show error messages:
ERROR CODE: ND47089
Tire pressure sensor subscription expired
Please schuedule service or enter payment information
Engine start failed
>MFW
Mustang Mach E dead 12 volt battery.
To get into the car, you need to remove a small cover on the bumper. That exposes terminals you can connect a battery to which pops the hood. From there, you can open the hood and remove the terminal cover/trim over the 12v battery. Jump/charge that battery and now you can pop the door open and start the car.
Not the best design decisions. Compounded by Ford stopping the traction battery from passively charging the 12v system if the main battery falls below 50%. A software patch allows the 12v system to charge when the car is off down to 25% SoC on the traction battery.