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the HV battery gets a permanent 12v supply from the 12v battery to enable cell balancing during standstill.
When a crash is detected a pyrofuse in the + connection of the low voltage battery blows and disconnects the 12 v supply to the HV battery causing a immediate emergency shutdown.
When your 12V battery gets depleted or faulty this has the same effect, your HV battery will detect this as a crash situation and disconnects.
I would suggest to disconnect your service disconnect connector before you install your new 12v battery- when you switch on your ignition you will see the red flash symbol with a diagonal line indicating your HV system is switched off.
Then switch off the ignition and wait for the car to go in sleep mode ( may take some time ! keep the hood or trunk open to access the service disconnect connector) -when the car is in sleep mode reconnect the service disconnect connector.
now you can switch your ignition on - this might reset your HV problem otherwise it might be nessesary to reset all stored faults.
You also have to register your new 12v battery with a suitable tester.
Good luck !
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