P0AFA, P3004, C1259, C1310, B2243

Hi everyone.

I have a Lexus with a similar system to gen 2 Prius (Lexus gs450h, 2006).

I bought it from someone in a slightly lousy state around 5-6 years ago and managed to put some trouble-free miles on it.

It had a few cell swaps done, initially by 3rd party specialists and eventually me and a friend of mine started swapping the cells ourselves.

After a few diy cell swaps, I was confident enough to do it myself, so I did (you know where this is going).

The second time I swapped the cells myself, something went wrong:
The car booted up, but all the errors stayed and the new cells didn't fix the pack.
I managed to do a full scan and then the car simply switched off by itself.
I got P0AFA, P3004, C1259, C1310, B2243 and since then, we could never fix it.
We've tried a confirmed working HV battery and that didn't help either.

No dashboard lights, except open door light, so there is feed from the 12v battery.
We've tried swapping the HV inverter and most of the easily accessible fuses have been checked.

Any tips are appreciated.

 

I should have probably specified, that the hybrid safety plug & it's fuse were inspected and can confirm that it was pushed to the max of it's hard plastic capabilities.

When I step on the brake + push the power button, the first time you do hear a pump or relay in the back or electrical component create the usual start up sound (almost like music to my ears at this point), but the sound lasts 1 second and no reaction to anything else. Power button stays unlit.

As we have tested the car with a confirmed working battery, this seems to be a problem with the battery's connectivity to the car, rather the actual battery, as the working battery still gave us no control, lights etc.
I will research the interlock manual, many thanks.

We've attempted to scan it, there is no feed to the obd2 at all.
The last scan yielded me the above error codes, minutes before the car lost all power, to never be started again.
P0AFA is the one that's in question, but thanks for the P0A0F.

Yeah, I'm familiar with the other codes.

We've also found that the non working battery had potential burn marks in one of the cables/connectors, but nothing has been melted or altered physically, just a small black smear sort of here, I highlighted it in black.

Upon dismantling the battery, before the car's last known working start up, I've had a small spark on this cable, highlighted in red.
I was wearing PPE, so no harm done.

Not sure how much help this results in, but good information to know.

Your help is much appreciated.

 

All combinations of OBD pins are showing open line, including the 6 & 14.

Rest of the fuses seem fine, the last one to confirm is the 150A one under the fuse box.

Some other interesting findings:
Some of the circuits are still working, that includes headlights on low & high, interrior spot lights (even the obd side light), horn, emergency button turns on the indicators, central locking system is working, but the seats, wiper stalk, indicator stalk, windows, sunroof are not working.

Attaching some pictures of the fuses & a video of testing.
Can't post the full link via text

 

Could be, it's not a Prius, as stated.

Anyhow, to everybody else, this seems to be a fusible link issue, will be investigating it.