Task 2 - Add the JDM switch and wire to the door harnesses. The wiring is already in the door harness from the factory. You only need to get the wires from the JDM switch, to the kick panels where the door harness enters the car.
*2011+ only: The wires are in the driver's door harness, but missing from the passengers door harness. This means you can follow the procedure to tap the blue/red and black/white wires for the driver's side, but you will need to run your own wires from the mirror switch into the passenger's door and up to the mirror. They need to be run as below:
Wire from Pin 10 on the mirror switch to the grey (pin 5/6 as above) wire on the mirror in the door.
Wire from Pin 9 on the mirror switch to the brown (pin 2) wire on the mirror in the door.
If you wired up as I laid out above, pins 2 and 6 (2 and 5 for base) are your folding wires. Those will correspond to two wires already in each door harness. At this point you should have the mirrors mounted on the doors, and you can button them up, no more wiring needs to be done inside the doors.
Now you need to remove the panel under the steering wheel:
Disconnect the switches from the panel and set it aside.
Also remove the kick panel trim so you can get to the door plugs, do this on both the driver's and passenger's side:
The kick panel is also held in by a tab under the sill trim, you will need to pull up the frontward snap of the sill trim to get the kick panel out.
Now you can get to the door plug/dash harness junction. It is behind where the kick panel was, held tight by a clip. you can slide the door plug down and of the clip holding it. It is easier to disconnect when you pull it off the clip. The lower plug is the door side, shown here:
You can see the two wires you want to tap into in this pic, the blue w/red stripe, and the black w/white.
The basics of what you want to do here:
Join the blue/red wires in both door harnesses to pin 10 on the JDM mirror switch. And then join the black/white wires of both door harnesses to pin 9 on the JDM mirror switch.
How you wire it is up to you. Once thing that is a requirement, is to get some extra terminals/wire from a junk car to insert into the mirror switch harness. In the USDM car pin 9 and 10 are not populated. There is no other way to do this. You can find many Subarus or Nissans or Toyotas with similar mirror switch plugs or other harnesses similar to the mirror and mirror switch plugs, that you can harvest terminals from. Just clip them off, pay a couple bucks and you got a whole connector full of terminals with wire you can use for your wiring projects!
Here is a shot with the lock plate removed, you will need to take that out to slide a couple terminals in. Just pry it up with a small flat blade screwdriver.
Refer to the Monkiboy's diagrams below for the slot numbers, but basically 9 and 10 are the two unpopulated slots next to each other above.
Here's where you wire it how you like, shown below are the wires I ran from each door harness to my "harvested" terminal wires. They are soldered and shrink wrapped. On the left side you can see my taps into the blue/red and black/white wires in the driver's door harness, I will plug into those with spade connectors crimped to the wires I ran.
Now just slide the terminals into the mirror switch connector, make sure you slide the one wired to the blue/red wires into the pin 10 location, and the other one into pin 9. Slap the terminal lock back on, should look like this:
At this point, you should be able to plug in your JDM Mirror switch, and try it out! Hopefully it works for you, if not post up in this thread and we will try to help. Remember the key has to be "on" for this to work, the mirrors aren't powered with the car off.
If everything works, install the JDM switch in the panel, and put everything back together. Then go enjoy your new toy.
*bonus* if you are fancy and want your alarm to control these mirrors, here is how they work: The wire from pin-10 gets (+) and pin 9 is (-) and the mirrors fold out and stay there. The voltage is applied anytime the car is on. When you push the switch to fold them, the switch swaps pin 10 to (-) and pin 9 to (+) and the mirrors fold in and stay. If your alarm can control a swapping setup like that, or you can think up the relay setup to make that happen, you could set it up so the mirrors fold when you arm and unfold when you disarm.