Finally got around to posting a how to on this install. Don't think there’s a complete right up on this yet so here goes.
I’m taking the system from my old 300zx. My main concern was to maintain the stock look inside the cabin and under the hood while having the ability to remove the box/amp if I need the extra trunk space.
I started by attaching the amp to the back of the sub.
Then dismantle the interior panels. This part is surprisingly easy. Most parts are just pulled of:
Some have this type of clip:
Just pull out the center part with your nail and then it pops off:
Probably the trickiest part is finding a place to run the power cable through the firewall so that you can't see it under the hood. We jacked up the car and found a soft rubber grommet around the steering column hidden by a plastic cover:
Next remove the glove box:
Then the radio, I used BP gift cards to separate the center vents from the microphone and then pull it back towards the rear of the car. These are just clips and good force will pop it loose, just take care not to scratch/bend the plastic, it’s very soft. Then a couple screws keep the radio in place.
At this point wire in the LOC, there is a wiring diagram for the big plug behind the radio here: http://www.mazda3forums.com/index.php?topic=145935.0
My_Mazda3 has a good write up there. I spliced the front speaker wires labeled "1A, 1C, 1D, 1F" on the diagram or "FL+, FL-, FR+, FR-" respectively. My LOC also had a ground which I spliced aswell, its "1W" (the big black one). Once wired in all thats left is to hide the LOC and run the RCA cables.
There is a nice little spot under the radio on the passenger side that’s big enough to hide the LOC (green thing) out of site:
Now the easy part, run the Power and Remote Cable on the driver side and the RCA cable on the passenger side. They should come around behind the rear seats then connect the Amp:
Now you can put all the panels on, clean up and enjoy your enhanced bass :-)
I did this install with my brother, both of us are pretty handy around cars, and it took us about 4 hours. Big Thanks to my_mazda3 for that wiring diagram.
From what I've read on other posts on running the power cable I think the steering column is the best place to run this. It looks really clean and with the battery cover on, the power cable is virtually invisible.
Next post is the finished product...