I executed "Battery replacement", then I ran test dual battery system, verify secondary battery charging, and quiescent current control module, unfortunately, all of them have failed (Please see attached)Ok.
It doesn't look like you're loosing comms with any modules on that bus other than the HVAC then.
In that case it looks like "Battery - Power supply service mode diagnostic" is not the BMS reset, as there is one BMS for each battery, and you're only supposed to reset the one(s) for batteries you've replaced ( not just recharged ).
You had a fault code for secondary battery in the image you posted earlier, but as it's no longer present in that latest pic, it doesn't look like it will be related to that.
The voltage was around 0.97V to 1 VYou could check the voltage between pin1 ( red wire ) and pin 6 ( black wire ) on the 26 pin connector on the hvac module.
As the can bus passes through the module ( 2 pins in, 2 pins out ) I think you can ignore that, as otherwise a lot more modules wouldn't be able to communicate.
Attached is picture of "PASSENGER COMPARTMENT FUSE BOX", I couldn't notice any water ingress!If there's been water ingress, there is normally corrosion on the pins on the FSJB, have a look through the other thread I linked above. If voltage is ok at the HVAC module then it's probably the module has failed and nothing to do with the FSJB.
I believe it's DX23-18D493-AC though this ebay listing is for ex23-18D493-AA which appears to be used on newer cars so probably could also be used. The module will need programming with SDD as far as I understand ( and I believe a 50amp 13.4-13.8v power supply is pretty much required while programming, but I'm sure there are others on the forum that have first hand experience of that. )
What is the correct voltage that HVAC module should see? As I mentioned above, it is nearly 1V
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