2008 won't start after sitting for 2 weeks. CM, ECU, or Hybrid battery?

Not the easiest thing to get a pic of, but here's one with more of it. Visually I can not see any breaks, burnt marks, etc.

 

2008 sat unattended in garage for 2 weeks.
On return it would not start or go into ACC.
Dash is dead. Could this be a hybrid battery gone dead?
If it was left with 1 or 2 bars on the hybrid battery charge level, could the hybrid battery gone bad and be causing the following symptoms?

When the power button is pressed with a working key fob inside the car nothing happens:
No green LED on start button.
No starting of the car.
No going into ACC mode.
No Ready indication.
No display on the dash (Combination meter items like fuel gauge, odometer, gear, speedometer AND no Maint reqd, check engine, TMPS, ABS, key in car, airbag, or Triangle of death flash).

Things that do work:
Horn
Headlights
Brake lights
Open door icon
Internal cabin lights
12V battery (verified good)
+++ No key icon (when tried without key inside the car) ***
Door lock/unlock by remote AND by buttons on door

Other Info:
As stated the 12V battery is good.
Both remotes have new batteries and can lock/unluck doors, will trigger "no key" icon when try to start car without them inside the car.
AM2 fuse is good.
Fusible links in the engine compartment fuse box all look good.

 

12V was determined as good by several methods. Took it to Auto Zone for testing. Swapped it with a battery from a working 2008 Prius - the working Prius continued to work. The bricked Prius with the battery from the working Prius continued to show no signs of life.

CR2032 in BOTH remotes are new and at 3.3V. Also both remotes remotely open and close doors. When a remote is inside the car it does NOT flash the "no key detected" warning. When there is not a remote inside the car, it does flash the "no key detected" warning. Plus physically putting the remote in the slot does not change anything.

 

I guess I'm not sure what or where the "safety fuse for the hybrid traction pack" is. But if it's the fusible link in the engine compartment fuse box - it looks OK. See attached pic.

It won't go to ready mode. When the power button is pushed there is no noise and no lights/LEDs on the dashboard.

 

Where would the fuse be? It just looks a plastic orange plug. Does it have to be taken apart?

 

The CM items do not work, but neither do other display items like no Maint reqd, check engine, TMPS, ABS, key in car, airbag, or Triangle of death flash. Nothing happens on pushing the power button either visually or noise wise. The LED on the power button also never goes on. No red, amber, or green. There are just 2 or 4 clicks from the engine compartment on opening the driver side door. Probably relays.

Well the 12V battery is getting to the following items:

Horn
Headlights
Brake lights
Open door icon
Internal cabin lights
12V battery (verified good)
+++ No key icon (when tried without key inside the car) ***

Tried using an OBDLink LX to read any error codes but it says it can not connect to the car. Even though the LEDs on the reader indicate communication happening. Can a CAN scanner read error codes from a bricked car (ie not able to go to ACC mode, ready mode etc)?

Update: Since it looks like trying to pull it apart might break it, just put the meter across the two exposed terminals. The meter went to a solid zero. In open air the meter was showing noise of random milli ohms, but once applied to the terminals it went solid zero.

 

At this point I think a mouse having chewed something is a possibility. Right now I'm leaning toward that, ECU issue, or Hybrid battery. But have not gotten anyone to confidently match the symptoms to those 3 possibilities or anything else.

 

Yep. Original post apparently stumped all those that had seen it, so was trying to get fresh eyes on it.

 

Well I was thinking, what is the most likely thing to go wrong with a car that's just parked inside a garage for 2 weeks? All, or almost all electronics, are not even powered up or being used. If they have no juice it makes no sense they would go bad in 2 weeks from just being inactive. Batteries on the other hand do not like just sitting around not being used. They lose power. And given that there's a good chance this one might have been left with only 1 or 2 bars on the charge meter a cell or two might have dropped very low. So that or a mouse chewing something seem like the most likely.

It's the ECU that gives the IG ON command right? Do you know if the ECU has any input from the Hybrid battery system? Or are all the decision making inputs coming into the ECU from the 12V system alone?