Hopefully i can help..
Very often with such faults as you describe this could be down to your
back door request microswitch itself which is part of the back door handle assembly - its a very common problem on the k12 micra.they often get effected via wiring by water/moisture/corrosion and cause a whole load of problems inc the boot popping on its own or not opening at all or causing the battery to drain etc.. the only method unfortunatly to get to boot open is to get it open manually lever on the catch from the inside.... i do hope this helps...
Some of these do not have the emergency release as per you handbook so would be worth checking that first. Ideally you have to fold down the rear seats and pull off the internal panel its just popped on with plastic poppers that hold it to the boot lid. Unplugging the small connector to the switch will release the hatch if it hasnt locked.but like i say the usual cause for this that button and is basically a case of removing it from the boot lid and replace it..another likely could be the latch lock itself but these very rarely give trouble.
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