Yeah, this reeks a lot of a 12V battery problem. Putting the 12v battery on a charger or jump-starting it only has a, oh, 75% chance of actually getting it back to life. (of course, plugging it into the regular J1772 charger won't have any effect, as it requires the 12V battery to start-up the charging systems, just the same as starting the car normally does.) The other 25%, well...
Welcome to what I call the "Christmas Tree effect".
Long story short: disconnect the 12V battery, wait no fewer than 20 seconds, then plug it back in. Provided the battery is actually charged, it should start right up. Your 12v battery is
not "bad", it just needs to be recharged for at least 6 hours. Don't let a dealer scam you on a new 12v battery.
Longer explanation:
The Leaf is infamous for its terrible 12V battery management, and tendency to just randomly drain the battery overnight. Now, if it just so happened that the battery was not ENTIRELY drained overnight, you'll be able to unlock the doors normally, get in normally, and hit the power button normally ("Chime..."), and the dash will flicker, everything will go a little crazy... maybe the alarm will go off... maybe you'll hear a "click, click, click, click..." from the dash, etc... but you end up with the same result: no starty car. Except this time, you can't just get started with a simple jump-start, because
the dash is now lit up like a Christmas tree.
When this happens, the car's computer sees
everything that's going on. It completely freaks out, thinks every module is defective, flags all sorts of false error codes, and of course, refuses to start once the 12v power is restored. It may think the inverter is bad, the main relay is bad, the brake control is bad, shifter unit is bad, all kinds of stuff it talks to. Every module in the entire car freaks out and reports an error.
In fact, I've even had my car do the strangest thing - after clearing DTCs using Leaf Spy, it'd start, and it'd go into Drive, but all my power bubbles were unavailable. Yes, it'd go to "D" (not "N"), it showed the "Ready" light and no error "!", and it wouldn't budge. I could push the car, though... but it of course, wouldn't regen either.
It could only be fixed by unplugging the 12v battery, waiting 20 seconds (to let everything discharge), then plug it back in and do the "clock reset of shame".
Keep a 10mm wrench and
one of these handy, and you will never be stranded by 12v battery woes.
(my jump pack probably comes in handy once every 2 months or so... way more often if you count every
other ICE car I've saved with it as well!)