Couldn't find a write up for visual learners like myself, so I figured I'd make one. This is how to install a Metra Axxcess ASWC in a 2006 ZX4... Or about as close as I can come to doing it right with virtually no electrical skills. Feel free to critique, as I'm sure some folks will know how to do this better than I. Also, if you follow these instructions and mess something up, don't blame me!
First thing I did (obviously) was remove the stock head unit. Removal was pretty simple. That part, I'm fairly sure most folks can manage without pictures.
Next, I installed the aftermarket wiring harness. I just used 18-22 butt splices. Also, pretty easy. Just match up the colors unless the instructions state otherwise. (pic is at the bottom)
Now for the ASWC.
Hook up the Green and White cable from the Axxess Unit to pin 18, and the power to pin 2. Ground will go to pin 19. I just used quick splices, which worked fine for me.
This is how it should look finished:
(ignore the duct tape, it was just to keep the latches on the quick splices down)
Now, if you look, you'll discover that pin 19 (the ground for the ASWC) is not actually grounded!
It used to ground through the stock stereo, so you have to make a new ground. I believe we crimped both the new wire that now grounds the stock harness and the ASWC ground into the same unit.
There are several places you can ground to. I used the screws that secure the unit that holds the head unit in place. However, I would probably recommend the hole at the bottom of the picture that's circled. It's solid metal. You just need to find a screw and nut that will fit.
And this is what the end product should look like!
Its kinda ugly, and soldering would probably be a way better route to go, but for those of us who don't have the tools, skills, or money to go that route, this way works pretty darn well too. The Metra Axxcess AWC I used automatically detected and programmed my Sony radio functions perfectly, so unfortunately, if yours doesn't, I can't help you there. Good luck!