Ghaith

Hi guys
Just bought this car to repair ( stolen and recovered )
EQC 2021

It seems the v12 dead I put a jump start and only thing works is the wiper works by it self and some interior lights.

-Key fob doesn’t lock or unlock car
- nothing on the dash and all black no ignition
- changed key fob battery and nothing
-

I checked fuses
I found the negative battery was disconnected.
And found this cable under the steering close to the brake pad but no idea where it goes I looked everywhere I can’t find it’s point stick .. .. any diagram or any suggestion please
Edit ( I think this is the temperature sensor it stays in the ca like that ) but not sure

Also fuses in the side looks okay to me ??
Please any help or suggestions where to look would be great.