I can see this topic is really old. Not sure if anyone is still interested in 2022, but I thought I would share my own experience.
I have the most standard version of the k12 micra, 2005 visia fit model, no ac, no front foglights, no keyless, no heated seats, and I could go on for a long time.
This car has been in my family since it was brand new, I don't think I will ever sell it. So it became a habbit of mine to upgrade stock parts into my basic little micra.
So far everything had been "pre-wired" from the factory. Fogliths, Foglights switch, Multifunctional steering wheel, tweeters for the front doors, "central screen" above the radio.
So I went ahead and bought a pair of heated electric aspheric mirrors plus the switch for it.
It is "pre-wired" sort of, but not completely.
When I popped out the stock plate where the mirror adjusting swtich goes, I was really happy to see the plug for the switch there. It plugged in nice, but when I took off the door card, I had to realize that the wiring harness for the door itself didn't come with the electric mirrors corresponding plugs.
This is where I stand currently. I am pretty sure, that in the next weeks I will wire it in myself, because there is a big connector with empty pins near the door hinges, under the carpet. I just need to find some wiring diagrams for it. (If anyone here is in possession of a wiring diagram for any of this, please contact me, or better, comment here)
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