Total amnesia after a grid charge!

My '08 has lost all communication between computers after a complete battery reconditioning (charge/balance, discharge to .8V/cell, charge, discharge to .5V/cell, charge, .1V/cell, charge/balance). The car won't start, many (all?) warning lights are on, and even the fuel gauge flashes empty which isn't correct.

I have these U codes:

U0293 - Lost communication with hybrid powertrain control module
0100 - lost com with engine control module / powertrain control module "A"
0111 - lost com with battery energy control module A
0126 - lost com with steering angle sensor mod
0124 - lost com with lateral accel sensor mod
0123 - lost com with the yaw rate sensor mod
0073 - ABS control mod communication bus off

Things I've tried:

I read 233V at the + and - terminals of the HV batt with the orange plug installed, and 0V with it uninstalled. Unhooked the 12V battery ground and reinstalled multiple times, tried erasing codes, checked all fuses underhood, under dash, the two on the 12V battery, and the big kahuna at the HV orange plug. I've checked the various plugs for looseness around the electronics on the driver's side of the HV battery, and disconnected the "car harness" portion of the grid charger from the main terminals to see if they were somehow interfering.

The only other fishy thing is that I have is that after the initial code read I plugged the scanner in again, and the park drive reverse neutral braking lights on the instrument cluster all had flashing blocks around them, and the scanner kept having problems communicating. Then it finally did after powering the ignition down and up again, but it didn't communicate with the PCM, although honestly I can't remember if I checked the fuses before or after this problem. I'm gonna go try it again right now.

I'd REALLY appreciate any brainstorming and help anyone can spare!

Gabe

 

I wish it had been so simple! Thanks though, I hadn't even checked aux voltage
12V has a full charge (I'd disconnected during grid charging but topped it off anyways) and I cleared all codes, but two stubborn new ones remain-
C1310 malfunction in HV system
C1259 HV system regenerative malfunction.
And no start.

Why do you think the fuel level light would be flashing empty?

 

Yes I've checked the orange plug.

I've removed the portion that hooks up to the HV battery, but not the inline fan controller. Do you think I should?

What ground strap are you referring to? Thanks for the info on the fuel level, and no I didn't take the plus out until after I had the initial problem starting. I have since checked them for being seated.

 

I do believe in miracles now. Yesterday I went to try starting again as I have every day for the past several days. I had wired in a 12V batt charger and gave it a better charge than my previous jump start charge, and having removed the grid charger wiring, checking every fuse in the whole vehicle, fiddling with several plugs back by the HV battery, I hit the button, and it started. There was a dead misfire on cyl 4 at first, which went away after about 3 minutes of warming up. I cleared codes again, and drove it. I reinstalled the grid charger harness with great trepidation, and tried starting again, which it did. Today I did one last charge/balance session. I do notice improved performance, e.g. the car will actually accelerate from a stop in EV mode now w/ no help from the ICE. And I can drive up hills. Coincidentally, my cell phone had been giving me battery trouble for a week or so now too, and it seems to have miraculously fixed itself today as well, so all I can figure is there was some sort of quantum hybrid lithium NiMH entanglement going on. So relieved to have the Prius healthy again!