[pablo_mtl]

It's a pretty common failure on AZD vans. And it often prevent your battery from precharging correctly.

The heater fuse quite hard to access (under the vehicle belly pan, un the HV junction box. Schematic is inside the box itself)

If you are HV-savvy there is also the possibility to disconnect the HV connector going to this heater, right there under the hood. You'll be left with an open HVIL contact, that you need to address. And an exposed open HV connector, that you also need to deal with and protect from weather, water, and fingers!

 

[pablo_mtl]

The heater "leaking" HV POS to HV NEG while the battery is trying to do its pre-charge and close its contactors is the FIRST thing to check. That will eliminate a major chunk in your mystery.

The next weak thing to check (that can also leak and prevent your pre-charge, with similar symptoms), is the Active Discharger device, black box plastic thing located in the HV junction box under the vehicle. It is used by the system to discharge the few capacitors on HV bus (mainly in the DMOC drive, chargers, DCDC, etc) once you turn off the vehicle. If this device is fried or defective, it will also prevent a proper pre-charge and prevent contactors from closing. Your vehicle can live without the Active Discharge device if you can live with a permanent check-engine-light. (then if you are ready to fork out money, you can try to find a remplacement).

So first: disconnect that heater (or better : heater fuse).
And second: disconnect that Active Discharger.