For everyone out there with this stock radio:
I am here to show you how I hacked the AUX port to add a cheap bluetooth module to the stock head unit. I was already using a cheap USB bluetooth to AUX unit that I purchased on amazon, I've had this unit for years and I love it. Its cheap, the sound quality is good, and it its simple:
It worked better in my old car where the cigarette lighter/12v port was on the dash close to the AUX port. As you know in our Versas the 12v port is back by the hand brake and this doesn't work super well, it requires an aux extension cord all the way up to the radio right in the way of where I am shifting. I decided to pull the stock radio out, solder the aux output of my bluetooth module right to the aux input connection on the radio, and put it back together.
Now just because I buried a bluetooth unit in the stock radio doesn't mean thats the best thing to do, in fact if I were to do it over again I would do it differently and I will explain in more detail below.
What skills do you need to do this hack?
1) You should be comfortable with soldering, and comfortable with the idea that we are going to solder some wires directly to our stock radio.
2) You should have some working understanding of basic automotive wiring and basic line/input wiring. You won't need much more than that.
***Disclaimer*** as per usual if you try to follow in my footsteps and you eff something up in your car, don't blame me. I am not responsible.
What I did: I soldered onto the aux port inputs of the radio and tossed the bluetooth unit into the radio itself (zip tied to the radio frame) and powered it off the 12v ON line the radio gets from the ignition.
What I think you should do / what I would do if I did this over again: solder a 1/8 line audio EXTENSION CORD to the stock radio and route the other end of it somewhere convenient for being hooked up to a bluetooth music receiver.
So take something like this https://www.amazon.com/AIFFECT-Exten...dp/B01GZPAXVE/
and snip off the male end (yowtch!) to solder that end to the radio and then route the female end of the audio extension cord somewhere awesome, such as
a) the glovebox (also add a 12v port to glovebox for your bluetooth module)
b) back by the handbrake where the stock 12v power port is
First you need to get your radio out. Technically, a clever person could leave the bulk of the radio in there and just take the faceplate off the radio and mod that, but all in all this will be easiest if you remove the whole thing. Other people have better how tos/videos of removing the radio so the short version is this: Yank off the knob on the inside/outside air selector arm and tuck it away for safe keeping. Then starting at the top right corner of the radio/climate control bezel, pry the bezel off. The whole thing is just held there by clips. Now the 4 screws of the radio should be visible and evident on either side of it. Carefully remove those screws without dropping them, pull the radio out and disconnect the wire harness(s).
Once the radio is out you can work with it easily on a bench. We need to separate the faceplate from the rest of the radio chassis, so we can get to the backside of the AUX port. The faceplate is attached via a bunch of plastic clips going all the way around all four sides. Use a small flat screwdriver to gently pry up the tabs, then jam a toothpick or similar into each gap so the clip does not settle back down and clip back into place. Do this all the way around and then pull the faceplate straight off. The circuit board of the faceplace has a multi-pin interface to the rest of the electronics of the radio. It will not be happy with you if you pull it off at an angle, STRAIGHT FORWARD off of the radio chassis. Got it off? Great! Take a look at the backside of the faceplace:
That cluster of 5 big solder points behind the aux port are the connections we are after here. Add an auxiliary line extension cord to this and you basically will have two aux ports, one of which you can route anywhere! So if you bought a 1/8" AUX extension cord cut off the male end and snake it through the radio chassis so it will come out near these solder joints (or figure out how the wire will escape once the faceplate is back on the radio). Then trim off the insulation and figure out which wires in your AUX cord are left, right, and ground. This will be on you to figure out since I don't know what cord you are buying. I used scraps of wire since I wasn't using a cord myself but if I were doing it over again I'd simply be adding an AUX cord extension instead of what I did.
Moving on, after some probing I have figured out the right/left/ground connection points for you, as seen in my annotated picture below. Note that I close two of the points with a small piece of wire. I *think* closing those two points is how the radio *knows* that an AUX cord has been plugged in. You know how the radio just *knows* when you have inserted a cable into that jack? Pretty sure thats what this is for. Either that or its closing the leads of an un-used microphone circuit... but more than likely you need this small loop so the radio *thinks* a cord has been plugged into the front.
Solder on your right, left, and ground of your AUX extension or chosen audio/bluetooth device and then you can put it back together. Not so bad, eh? Now assuming you have just used an AUX extension to create a second AUX port on a 6 foot long wire, all you need to do is route the other end somewhere convenient. If instead you have done like me and wired a bluetooth device directly in, find a good spot to tuck your module away and get it some power. Obviously you can use the radio chassis for ground and one of the blue wires on the radio harness turns 12v with ignition and I used that to power my bluetooth nugget. In hindsight I'd say you are better off popping out the center console between the front seats and using the cigarette lighter port for power.
You do what you want, as you can see this is a very loose guide and I am expecting you to customize this to your taste, I show you where the AUX connection points are and label left/right/ground for you and that is really the only critical information you need, you can take it from there and fill in the gaps with other people's videos and how-to's. All you really need is working knowledge that line in audio for your radio has these three basic wires and with a little tinkering you can re-route that AUX port somewhere else so you can add a bluetooth music module or simply have your aux back by the handbrake and plug into your phone there if you prefer.
Some people will probably wonder what happens now because the car already has bluetooth for voice and now I went and added a second bluetooth module for music, and you may ask "does that work?" the answer is it depends on your phone. Now I will point out you can test everything ahead of time before dismantling anything, thats what I did. I tested my aftermarket bluetooth module and being happy with its performance I decided essentially just to hide it in the dash so I wouldn't see it or have aux wires hanging out of the front of the radio. Now I wish I would have done it differently mainly because its now difficult to pair a new phone to that module... because I buried it in the dash, thats why I'm saying you should just create an AUX extension and put it where you can get at it more easily. Easier to upgrade someday too if all of a sudden bluetooth goes out of style and redtooth becomes the new thing...or who knows what...
On my android 6.1 phone it will happily connect to the stock car bluetooth for voice and the aftermarket bluetooth for music. In the bluetooth device settings you just tell it which device should handle calls and which device should handle music, and you are good to go.
Mine is working great, I hop in the car, both the stock bluetooth and my aftermarket bluetooth kick on and connect. I set the radio to AUX and use the phone to control playback (play/pause/skip etc). The audio quality is good (even tho I buried that module in the radio metal chassis...) and my dash is clean, no wires hanging out, total wireless connection to phone and I can still do phone calls through the stock system. No need to replace the whole radio just to add one minor feature of bluetooth music streaming.
If you have questions I will try to answer, those of you with degrees in backyard-cobble-engineering are probably already halfway to your garage. That diagram labeling the solder points is all most will need.