Brief update...
I bought a vcm - looks like it doesn't work without a reflash /sigh but I've now got a vcm and BCM
I had a look at the fuses in the IPDM E/R again...looks like I was wrong - I pulled the wrong fuse the last time - I have 2 clicks and if I remove the 2 VCM fuses, they stop (each click controlled by one) although the clicks did occur with the _other_ vcm - so it isn't the module itself, it's something rebooting that module as suspected earlier in the thread
@GreenaGiant - By chance do you have the LE link leafspy dongle? I've noticed that after disconnecting the vcm and BCM, the clicking doesn't return on first boot - I think it might only return after using the dongle - also can you tell me if all your bulbs are working? Nissan rep said this wouldn't be the issue, but I need to rule it out haha
I now have a brand new 12v in there, and it's lasting much longer - it free falls down to 12.2 then sticks there :shrug:, I just run the AC nightly atm
I also installed OVMS, it's lasting longer even with the additional drain (haven't disconnected my TCU yet) - one of my next steps is to connect up the can log on the OVMS and try to suss out the messages during the clicking - might point us somewhere
http://blog.cardiagtool.co.uk/how-to-reprogram-nissan-ecu-in-a-cost-effective-way/ <- stumbled upon this, think I'm going to try to grab a consult 3 programmer and swap my BCM, vcm and see if consult says anything