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BoomGoesTheDynaMitt
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You will still lose fader functionality. The Nexus output will only be 2 channels (right & left). Your headphone to RCA adapter only has 2 channels. You could use splitters to change it to 2 identical right channels and 2 identical left channels but fading would be impossible. Regardless, I think it would sound ok for a system that is basically the cost of the harness adapter (good call on that, I forgot that feeds signals to the amp).

Keep in mind you can probably get a HU with a line/aux input these days for well under $200. :dunno:
 

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Discussion Starter #22
You will still lose fader functionality. The Nexus output will only be 2 channels (right & left). Your headphone to RCA adapter only has 2 channels. You could use splitters to change it to 2 identical right channels and 2 identical left channels but fading would be impossible. Regardless, I think it would sound ok for a system that is basically the cost of the harness adapter (good call on that, I forgot that feeds signals to the amp). Keep in mind you can probably get a HU with a line/aux input these days for well under $200. :dunno:
Yeah. That's true. I didn't consider the front and back situation. I rarely have more than one person in my car anyway. Maybe if I throw a crossover in the mix it could regain that? I'm not sure if they give that much control or not.

I ready set up Google Voice and Groove IP on this thing yesterday so I can officially use it to make and receive calls. Maybe a bluetooth mic on the visor would take care of the integrated mic being covered by the dash. Hoping to find a small piece of sheet metal to lay across the stereo opening, maybe line it with some clothes or felt so it doesn't scrape up the tablet. Glue a bit more around the edges of the dash opening so it wouldn't cut into the screen. It's easy enough to remove that section of the dash to remove the tablet as needed.

Another way to go would be to buy a case for the tablet and throw some vecro on the case and dash. Would be messier with all the wires out front, but easier to place and remove. I'm going to order the harness tonight and I should hopefully have it sometime through the week. None of the last local shops have it on their websites and with the gas situation here, I'm not going anywhere I don't need to. Lol work and home. I still see people out there getting their hair and nails done. It's crazy.

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Discussion Starter #23
Ok.. So, I bought the wiring harness, two double female to single male RCA cables to bring the four channels down to two. Then a dual female RCA to single female 3.5mm, and a 3.5mm patch cable with one angled tip to make it hopefully make it easier to fit behind the dash. Hopefully this works out. Got it all through amazon. Hopefully i will get it by the end of the week.

I'll report back on how it works out. I'm still open to other suggested methods.

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Discussion Starter #24
I finally got all of the stuff I ordered today. It all came in three different packages from different places.. Wiring harness came last... figured.. lol

So, I connected the part for the amp, and went down the line with adapters and whatnot. No dice. I blew that fuse somewhere along the way because I forgot to pull it before messing with stuff, but yeah.. I still get no audio after replacing it.

I figured maybe the amp needed some sort of signal from a head unit to power on, so I reconnected the head unit that was in there and kept the RCA plugs connected to my phone for the audio signal. That didn't work either.. So, i'm pretty stumped.

It's not entirely a waste, since i'd need the wiring harness for a new head unit if I have no choice but to go that route, but i'm really hoping that I don't have to.

There is still that other connector with the 4 wires that I feel should be connected to something, but there is nothing on the metra harness for it. Anyone care to weigh in?
 

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Discussion Starter #25 (Edited)
Anyone? I really figured this would work. My only thought it that maybe the amplifier isn't getting any power? I still haven't managed to find a proper wiring diagram for this stuff, so I have no clue which wire does what.

At this point, I'm concerned even a new head unit wouldn't even work.

EDIT: Ok.. So I was right about there no being power to the amp. I figured it'd be one of the two red wires so I tried them both. I now have audio, but obviously no ground. So there is a lot of static and humming and I haven't even started the car yet entirely. Lol Blew the fuse being stupid trying to figure out which it was. Anyone know which it is? The wiring diagrams I keep finding don't have the same color scheme as what I have, so i'm either looking in the wrong place or the diagrams are for another year. Or the guy before me changed the wiring entirely.

Edit #2: figured out another issue.. the amp doesn't shut off with the key being off. Glad I noticed before it drained my battery. I pulled out the whole stereo and tray housing and brackets and am just leaving the open hole for now. I am not very savvy when it comes to wiring this stuff. I'm actually surprised I managed as much as I did so far. Any help on how to proceed would be appreciated. Until I figure out the power issue, I guess I'll have to hope I remember to disconnect things when I get out of the car.

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sorry, haven't been checking on this thread much..

you're probably better starting to look over on a forum like mp3car for generic help with integrating things like the nexus into the car. it's a generally foreign topic to most car audio people. luckily, i run a car pc ;) (and i love showing it off to car audio buffs because they all get confused real easy when you take away the head unit :lol:)

like mark said, you're going to loose fade controls. there just no getting around it without additional hardware, but going 'headless' and keeping that functionality is completely possible as well if needed.

but otherwise, it's a relatively painless process to get everything to work together.

you still need the mitah adapter talked about before, but for different reasons.

you really only need to connect 2 wires-- the 'acc' line from the rectangular plug, and the single blue wire that is part of the round plug that has the rca connections.

connecting those 2 wires will get the amp to turn on whenever the car is turned on, and will turn it off as soon as the car is off.


but that only handles the amp, so if you're interested in adding a charging circuit to the nexus to keep it in the car, then you'll need the same wire off the rectangular plug, and also need to add a ground to it. that will just make the nexus charge whenever the car is running.

which also has the nice side-effect of allowing plugin's to tell the ignition state, so you can have it auto-lock, auto-turn-on, and other cool features.. unfortunately, that is about all i know about it-- i know that the feature-set exists, as i have seen guys on mp3car talk about it's use, but i don't know any of the specifics about it because tablet installation has never been a focus of mine..
 

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Discussion Starter #27
Thanks for answering. So, I should be using the acc wire instead of the constant power then? Or am I misunderstanding.. either way, I guess I could always throw a switch under the dash and chain in so the switch cuts the power as needed.

The humming was only an issue until I actually had the nexus plugged in. Once it was connected, it disappeared.

Its not a huge deal to lose the fade at the moment. Any sound is better than the silence I've had. Lol for the moment, i'm happy enough as it is. I just don't want to "permanently" mount the tablet before getting the power to cut off on its own.

I temporarily just pulled the USB cable from my normal phone charger up behind the HVAC controls since that already turns on and off with the car. I have the second jack inside of the center console/armrest if I really need to charge anything else.

I'll check out the other site you mentioned if you think others there have done similar things. Thanks for letting me know it existed. Lol

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yes, definitely use the acc wire instead of the constant wire. there's no reason to ever need to keep the amp turned on if the car's not on. you could add a switch to connect the constant wire to the amp if you really want to listen to music without the car keys, but i've got a switch like that, and i don't use it all that much..

yeah, mp3car is a great little place for all the nerds that don't want to keep pc's out of their cars :lol: it's been a little dead over there lately, but there has been plenty of successful android/nexus/tablet builds completed, so there's plenty of resources for somebody just getting into it.

once you've got it all installed, and if you ever get bored, take it to a local car audio shop and tell them what you're running. it's great entertainment, at least for me!
 

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once you've got it all installed, and if you ever get bored, take it to a local car audio shop and tell them what you're running. it's great entertainment, at least for me!
:lmfao:
Do you ever roll past a BestBuy install bay and ask them if they can take a quick look at a problem you're having just to troll them?
 

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i used to try, but it's like trying to talk to a monkey. as soon as i say '12db/oct crossover', their eye's usually glaze over...

i once tried to ask a guy if he knew anything about alpines IMprint system.. it took him almost a hour to come back with anything, and by then i knew more then him by reading over his shoulder....
 

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Discussion Starter #31
I tried switching the blue power wire to the to the Red Acc wire on the other part of the wiring harness and it wasn't getting any power that way with or without the car running. The closest I came was using the dimmer wire and it powered on and off with the headlights.

also, I found that the HVAC controls kinda get in the way of mounting the tablet.. Currently, it sits on that and leaves it a bit higher so, the top of the screen gets cut off a tad while the lower shows some tablet bezel.. not sure if I want to cut into the plastic or not just yet. I want to get the wiring down first.
 

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I maybe misunderstanding this whole conversation here but if your having problem finding a acc wire all you need to do is find a account wire under your dash go to your local parts store buy a tee wiring connector and a male spade connector the same gauge as the wire you plan to use and there's ur account wire for your amp turns off when car is off and on when key is turned to access or run as for ground most cars have random "grounding" points throughout the dash
 

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Discussion Starter #35
do you have a volt meter to check the wiring? i know that method works, because that's how i currently power up my aftermarket amps ;)
Yeah.. I suppose a meter would be the smart way to go.. lol I'll have to pick one up sometime this week. I did already try all of the wires accessible from the wiring harness though. The yellow wire was the constant(which I'm currently using and just disconnecting the harness when I get out of the car), the red says ignition, I think. There were only two others. One was for power antenna and the other was for a dimmer. Connecting to the dimmer wire worked when the headlights were on, but that was it. Constant or dimmer. Nothing else gave power that I could tell.

Lol.. autocorrect makes fools of us all at one time or another.

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Yeah.. I suppose a meter would be the smart way to go.. lol I'll have to pick one up sometime this week. I did already try all of the wires accessible from the wiring harness though. The yellow wire was the constant(which I'm currently using and just disconnecting the harness when I get out of the car), the red says ignition, I think. There were only two others. One was for power antenna and the other was for a dimmer. Connecting to the dimmer wire worked when the headlights were on, but that was it. Constant or dimmer. Nothing else gave power that I could tell.
if you've got a harbor freight in your area, they constantly have sales and stuff on meters for cheap/free..

this one is currently $5(i've got a few for free, or $2 before):
7 Function Multimeter

the colors sound about right, i always get them confused though.. i won't speculate eny further until you can test those wires and see what really has power..
 

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Discussion Starter #38
if you've got a harbor freight in your area, they constantly have sales and stuff on meters for cheap/free..

this one is currently $5(i've got a few for free, or $2 before):
7 Function Multimeter

the colors sound about right, i always get them confused though.. i won't speculate eny further until you can test those wires and see what really has power..
$5? yeah.. i'll definitely grab one over the weekend. I used to work at one of the Harbor Freight stores nearby for a bit, so there is one around. I only lasted a week or two there(as a second job). My main job at the time was on the receiving dock at the Sears around the corner from it. The bunch at Harbor Freight wasn't exactly on the intelligent side. They were absolutely mystified that, without thought, I was able to move one of the larger air compressors they had from one side of the store outside and into the customers truck with a pallet jack after three of them stood around the compressor scratching their heads trying to figure out how to do it.

I really don't like to be that person.. but it quickly drove me up the wall and I quit.. lol

anyway... i'll grab one after work tomorrow or take a trip there Saturday morning and list out the labels on each wire and if they're actually putting out any power.
 

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Discussion Starter #39 (Edited)
OK. So instead of going crazy trying to figure out why the ignition wire had no power, I hit the fuse box with a test light and went through the spots that had no fuses but still had contacts. Found one that turns off and on with the car and connected wire to a fuse and popped it in there.

That takes care of that.. Lol I should have just done that from the start but I was trying to keep things clean. Now to figure out a proper way to mount the tablet, but I guess that's a new topic of its own..

I've kinda been wedging it in between the HVAC controls and the air vents, but three issues there.. First, it sits up too high, so part of the screen is slightly covered. Second, doing it that way only allows for one angle and its not the right one. It leans too far back and leaves space at then top and sides, which means reaching a tad further for the notification bar and whatnot. Third, and most most annoying, its just not stable. There is nothing really holding it there, so a decent bump or misjudging space and tapping the screen too hard by mistake tips it over and.. Yeah.. Lol

I already set it to keep the screen on when connected to power, and then shut off after 15 seconds with no power. Going to have to figure anyway to script the audio to stop when power is cut so it doesn't continue playing for no reason. Maybe play when power is reconnected. Not a huge deal. I could just hit stop.. Lol I'm not lazy.

Proper mounting is my main focus. I can't drill into anything since its thin to begin with. This is how it's going currently, at least.






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In the main connector, there is...
Green/White
Black/Yellow
Red/White
White/Black
Solid Pink?

Then the second has
Solid Red(Guessing this would be the main power?)
Solid Black(Guess the ground?)
Solid White
Solid Brown






On the second connector what do those wires do and do they need to be wired in to an aftermart set up?
 
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