Hey! I got a new head unit with 3 RCA outputs and just wired the new harness the same way you did. Before I start pulling everything apart, do you have any tips about how to run the wires?
I'm planning on doing a 5 channel amp in the stock place. To make this work I was planning on just running all new wires and leaving the stock harness as is.
Sorry this is so much, there's just so little resources on it. And you know how much of a pain in the ass it is. Thanks so much for your help.
Not a problem.
For the wire from the battery + to the amp, I ran it through that little padded cover down by the gas pedal. I attached the power wire to a flat head screwdriver with tape and poked it through the fire-retardant material and I could then see it in the engine bay. No need to drill any holes, but I think I pulled off the padded cover first. Pretty easy to zip tie to some existing stuff in the engine bay and get to the battery from here. Inside the car I took off as many interior panels as I could and sent it around the back of the center cluster, up under the glove box, around to the passenger side and down through the carpet by the little door step guards (took those off) and connected to the amp. I think I took the glove box off (not fun) but also a great time to change the cabin air filter.
Removal of the passenger seat is also necessary. It is just four bolts and then you do have to be somewhat careful unplugging the airbag harness. I remember having to use a little flathead to hold in the tab to get it to release (Info elsewhere on the web about this). Did not have any issues with airbag lights etc after plugging it back in.
For the amp ground, I simply sanded around one of those little studs after taking out the amp and used an existing bolt (maybe?) to attach it. Whatever you end up doing, I would advise using a voltmeter to find a very low resistance location. This is the most likely place to get signal interference.
The two RCA cables plugged into the back of the head unit went down behind the center console and then out the bottom and into the center area under the cupholders and E-brake. (Remove cupholders and e-brake cover etc before). Then, once you are in line with the amp, just drop them down through the carpet and use whatever claws you have etc to pull them through. The remote turn-on wire for the amp will also follow this path.
Note: I followed the convention of running the RCA cables separate from the Amp power wire to avoid interference. Going down the center is also shorter and you'll save cable space.
Were you planning on running new speaker wires to every speaker? For my case, I just found the speaker wires at the factory amp location, clipped them off the factory connector hooked them into the new after market amp from there. (Left out the factory "subwoofer"). The wires that connect to the factory amp were a little short so I ended up extending every one to reach the new amp, still seemed easier than running new wires to every speaker.
Don't forget to plug in the big metal AM/FM Antenna wire to the back of the new head unit! The wire is super short and I forgot the first time and didn't have a radio for about a year
If you have any more questions, don't hesitate to ask!