Car not starting, brake system errors

[Cyanotic]

I have had my car twenty-nine days, 2017 EX-T. I was hard wiring a dash camera (I used an empty fuse slot), and installing a powered sub today. I had my battery disconnected for most of the process, I only re-connected it to test to make sure things were working as I went along. The sub wouldn't turn off when I turned my car off, so I decided to disconnect it until I could figure that out. I hooked my battery back up and that's when I started getting all of these errors. I disconnected the battery and went ahead and disconnected the dash cam from the fuse box too. I left everything unplugged for a few minutes and I am still getting errors. At one point when I was checking fuses and connecting/disconnecting I got the error to use my fob to start my car once. I decided to test the battery with a multimeter and it was under 12v. I have the battery on charge right now.

Can a drained battery cause those errors to come up?

 

[Fk8 4343]

Can a drained battery cause those errors to come up?

Yes. drive around and those errors will go away after a few minutes.

 

[Cyanotic]

I couldn't even start the car. I charged up the battery and it started. It scared the shit out of me because I just got the car and it was throwing the errors and it was just the battery the whole time.

 

[davidgostbo]

one of your fuses broke. check all of them
not because of your battery

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