Not sure of your problem? but if the boot keeps locking/unlocking it is the micro switch letting water in which is a common problem with micra,s as water drains down the boot door onto solenoid and switch,i had same problem on my 06 model speak jenny at nissan customer services she was very good,they reconize fault and have redesigned dont take shit from dealers( not covered by warranty) that is rubbish it is a design fault and i got mine foc 16/02/10 at lightcliffe nissan in halifax hope this helps (stand up for your rights)
julian (halifax), February 2010