Hey guys.
I need some help , please.
I'm a repair mechanic.

Scania P-320 with a problem with the electronic master key, does not start, does not work, 24 volts power supply is off.
Battery is 24 volts , all good , new
The master key button is in the "ON" position but the system refuses to start the vehicle, no voltage appears in the vehicle circuit.
This vehicle model has an electronic battery charging system, I still don't understand how this works, the relays connect contacts, but do not release the 24 volt battery voltage.
I need the electrical diagram of the batteries and control unit ( electronic master key )

some help ?

Scania Truck ( south american )
model = P-320
year = my 2019
VIN number = 9BSP8X200K3956596