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Old 05-17-2011, 05:39 PM   #1
drewpaul86
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Default How To Use the Stock USB Connector with Aftermarket Headunit

Preface:
I searched the forums for a bit, and was only able to find information about using the AUX port with an aftermarket HU. I recently installed a Pioneer AVH-P4300DVD since I didn't want the navigation and I still wanted the larger touch screen. Much happier with the sound over the stock headunit. I am currently waiting on an amp kit so that I can install an amp and subwoofer.

So in the meantime I began prepping and decided I'd fix my issue with not having the usb port in my armrest anymore.

This was done on an '11 5-Door with non-nav base headunit. The USB Connector used is called a Key-A that connects to the rear of the OEM Headunit.

How To:

1: For removal of headunit follow the instructions in here: http://forums.nasioc.com/forums/show....php?t=1399151

2: For removal of center console follow the instructions in here:
http://www.iwsti.com/forums/how-inst...r-install.html

If that link isn't allowed, then google "08 wrx Shifter Install"

3: From this point you can see that inside the arm rest runs a black wire. The wire is clipped to other wires heading in the same direction. I removed the wire from the interior of the car so I may work on it with more light.

When removing the wire there are two clips that are harder to get out.

This clip is inside the compartment that houses the headunit:
[

This clip is looking at the center console while under the glovebox. This one was the harder one to pull out, I used a needle nose pliers to compress the barbs:



Once removed I figured out what each wire stood for. I began by removing the female end from the OEM Radio and figuring out which pin was what. I'll just post the results of what I found, but if you want more information on how I got these feel free to ask. I found out that they were color coded by all standard colors for USB.




I cut the Male Key-A Adapter off of the factory wire. Unfortunately I only took pictures of how I began prepping the wires and a mostly finished shot. I will attempt to explain a little better what you will see in this picture.



Refer to the codes above for each of the wires meanings. The silver bundle on the left is the shielding that was wrapped around the twisted pairs. Main importance in this is you will have the exact same look from any of the other USB wires you use and hack apart to give a standard - A connector to this wire.

I soldered each of the wires together, Red-Red Green-Green etc. Although I tested each of those wires before doing this as well. Though that was purely precautionary on my part. Do not solder the shield bundle yet. In an ideal situation you are able to strip the wires at different lengths so there is no possible shorting that may occur. I did this but was a little paranoid so I wrapped a little electrical tape around each soldered connection, then around all of the wires as shown in the next picture.



As you can see in the above picture, I have taped all previous wires into a bundle and then taken the shielding wire and twisted it together. I then soldered these two together as well. Afterwards I used Heat Shrink Wrap and covered the entire joint. Make sure that you put the heat shrink on the wire before beginning your connections.

Final product shown here:



Feel free to ask for more information.

I tested this all before installing back into my car by plugging the end I just attached into my computer and plugging an iPod connector into the opposite end ( usb inside the arm rest ). All data functions worked, was able to view all files and the iPod reacted properly as to showing that it was connected.


Thanks for your time,

Drew
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Old 05-17-2011, 06:29 PM   #2
STIGoober
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AWESOME!!!! I suspect you are the first to do this as most do not want to cut into their OEM cables and/or open up the OEM headunit. This is exactly the info I need to bring to my installer next week.

Well done and thanks!!
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Old 05-17-2011, 06:37 PM   #3
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BTW - does anyone know where to buy these Key-A adapters ? Ideally I would like to get my hands on the female version so I don't need to cut into the OEM cable.....
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Old 05-17-2011, 08:52 PM   #4
drewpaul86
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I havn't seen any part numbers on them, but I will look further when I get home tonight.
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Old 05-17-2011, 08:54 PM   #5
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Quote:
Originally Posted by drewpaul86 View Post
I havn't seen any part numbers on them, but I will look further when I get home tonight.
Cool. Are you sure they're called Key-A connections? I've had no luck tracking them down via Google. Also, if you could post more pics of the connector that may help us track it down.

Once again - nice work!
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Old 05-17-2011, 09:43 PM   #6
drewpaul86
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Found a serial on it:

http://www.hirose.co.jp/cataloge_hp/e76700019.pdf

That's all the specs on the plug. If you scroll down it's the 4-Pin Connector on page 135.

Serial: GT17HN-4DS-HU

That's the outer housing serial if you look in the pdf. But all information on the individual piece is posted there as well as mating pieces at the bottom of p135.

I only called it a Key-A because of the words on the brown piece of the terminal.
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Old 05-17-2011, 09:57 PM   #7
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^^ Great. Thanks again.

Update: Looks like I'll be cutting into the OEM cable after all. The only place I can find to order these connectors has a minimum order of 65 units at $3.18 each (And that's just for the female side. The plug itself is made up of 4 components it seems!) Oh well, at least now I know the color code and can solder a connection so I can re-use the stock USB port.

Last edited by STIGoober; 05-18-2011 at 12:12 AM.
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Old 05-18-2011, 01:18 AM   #8
drewpaul86
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Yea, my original thought was to make an adapter from the piece i took from the oem head unit, but realized the electrical connections weren't going to be any where near as good as i'd prefer without printing a small circuit board. So I decided to figure it out.

I'll be installing an amp and sub tomorrow so should be an overall huge improvement on the original sound.
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Old 06-02-2011, 01:38 PM   #9
bdot
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Sorry for the noob quetion, this is going to be the first time I install a HU in my car. And i want to make sure i understand the process before ordering/taking apart my car.

What are you removing the Male Key-A adapter from? are you using this adapter to connect to the USB wire, then plugging this adapter into the aftermarket HU? What was the original purpose of the Male Key-A adapter since you're cutting it?
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Old 06-02-2011, 01:46 PM   #10
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Quote:
Originally Posted by bdot View Post
Sorry for the noob quetion, this is going to be the first time I install a HU in my car. And i want to make sure i understand the process before ordering/taking apart my car.

What are you removing the Male Key-A adapter from? are you using this adapter to connect to the USB wire, then plugging this adapter into the aftermarket HU? What was the original purpose of the Male Key-A adapter since you're cutting it?
There is no "male key-a" adaptor. there is a male and female version of the connector used by subaru for the USB that one could order, along with all the other pieces needed, and make your own connector/adaptor with, but there is no adaptor or parts off the shelf for this at this point in time.
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Old 06-02-2011, 08:29 PM   #11
drewpaul86
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I am taking the OEM USB Wire that is currently run up the center console and into the stock headunit and removing the male key-a plug and replacing it with a standard usb connector that can plug into any aftermarket headunit.

For testing purposes before installing it completely I just plugged it into my computer and all worked well. Granted to get the standard connector I had to destroy a different usb cord, but it was a spare I had.
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Old 06-03-2011, 01:45 AM   #12
bdot
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Oh I see what you did. So you removed the male A connector and replaced it with a standard USB end to connect to your aftermarket HU?

The aftermarket HU I want to use is the pioneer avh-p3300bt. In the back of the HU there is no USB port. Do you have an idea on how I could connect factory USB port to the aftermarket HU? any help would be appreciated.

Edit: Heres a link to the HU Pioneer AVH-P3300BT

Here you can see the back of the HU and the ports available, if anyone has any ideas please chime in!

Last edited by bdot; 06-03-2011 at 06:54 AM.
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Old 06-03-2011, 12:42 PM   #13
first suby 2010
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Quote:
Originally Posted by bdot View Post
Oh I see what you did. So you removed the male A connector and replaced it with a standard USB end to connect to your aftermarket HU?

The aftermarket HU I want to use is the pioneer avh-p3300bt. In the back of the HU there is no USB port. Do you have an idea on how I could connect factory USB port to the aftermarket HU? any help would be appreciated.

Edit: Heres a link to the HU Pioneer AVH-P3300BT

Here you can see the back of the HU and the ports available, if anyone has any ideas please chime in!
On a 3300 you cant without pulling the radio apart and being really good at soldering... use a 4300 and you can plug into the back of it.
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Old 06-03-2011, 03:43 PM   #14
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I've already looked at the 4300, it looks nice but it doesn't offer built in bluetooth. I think the only other units with BT, USB, with the correct port in the back are the units which also include NAV, which adds another 400...

Anyone have suggestions on how to get the AVH-P3300BT to work with the Factory usb port, or potentially another HU?
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Old 06-03-2011, 05:16 PM   #15
first suby 2010
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Quote:
Originally Posted by bdot View Post
I've already looked at the 4300, it looks nice but it doesn't offer built in bluetooth. I think the only other units with BT, USB, with the correct port in the back are the units which also include NAV, which adds another 400...

Anyone have suggestions on how to get the AVH-P3300BT to work with the Factory usb port, or potentially another HU?
You could get the CDBTB200 for it and then have bluetooth and your rear USB...
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Old 06-03-2011, 05:33 PM   #16
drewpaul86
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as stated, since the 3300bt does not have a usb port on the rear it is possible to redirect the port to the rear by disassembling and soldering a connection to the existing one. Overall I'd call it a bigger pain in the ass than it's worth it.

I use the 4300, my main goals were to have the ability to expand to what I needed while keeping the crap like usb and aux ports off the front. Love it greatly. I did not see the need for the bt when I purchased the 4300, however as first suby stated, it is possible to get an addon for it.

Adding the bluetooth is a little bit more but you can mount the microphone where ever you want. The most common place tends to be on the steering wheel column as it is right in-front of your mouth instead of built into the headunit itself. I don't know where the 3300 mic is, but might be something to look for.

I know a few people with mics built into their headunit and I hate talking to them when they use it.
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Old 06-03-2011, 05:34 PM   #17
drewpaul86
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Here's the link for the bluetooth module:

http://www.crutchfield.com/p_130BTB2...TB200&skipvs=T
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Old 06-04-2011, 11:58 AM   #18
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this is exactly what I have been waiting for. 1,000 thank you's.
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Old 06-07-2011, 07:24 PM   #19
drewpaul86
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Glad at least a couple people can use this information
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Old 06-08-2011, 01:42 PM   #20
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But USB only doesnt allow you to watch videos from the iPod/ iPhone.
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Old 06-10-2011, 02:10 PM   #21
drewpaul86
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Quote:
Originally Posted by littlewhitewagon View Post
But USB only doesnt allow you to watch videos from the iPod/ iPhone.
I am beginning to write up how I did the AUX input.

Unfortunately, for videos the standard iPod/iPhone usb cord does not send the video data through the usb cord which is why Pioneer offers a non-standard cord.

Last edited by drewpaul86; 06-10-2011 at 03:03 PM.
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Old 06-24-2011, 06:35 PM   #22
rkjunior
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Bump to this to see if you did the AUX input as well?

Also, anyone know the part number to the entire wire(s) inside the subaru for the AUX/USB? Might make sense to do this on a new one just in case it gets messed up.
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Old 03-06-2012, 05:15 PM   #23
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Bump. Great info that should be stickied... Worked perfect for me.
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Old 03-06-2012, 05:53 PM   #24
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This is exactly what I was planning on doing once I got all of my parts in.. since it would appear that the 2012 impreza also uses the proprietary usb connection. I'm also tempted to try to hack together an aux input so that I can retain all of the center console functionality. I'm also tempted to just get a large flash drive and load everything i want on it and leave it in the car lol
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Old 05-15-2012, 10:23 AM   #25
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Well, I just ordered parts from China to make this work without breaking any factory wires. Only catch.. my WRX doesn't come till July, and the parts from china will take a month anyway.

I cant say for sure this will work, but if it does I can make them and sell them for ~$5 each to people.. I had to order enough to make 20 to meet minimum requirements. They will cost $3.50 in parts each and require about 5-10 minutes each to put together... and will probably be wrapped in electrical tape so it wont look professional. But it will be as easy as plugging in connectors for USB and the 4 pin piece factory harness.

Im not comfortable sharing what I bought as I cant say for sure it works and dont want to send people off.. it will require some soldering to make the 2 parts work together and some testing to get the right pin outs anyway... If I get it working Ill post a tutorial with LOTs of pics and video because i know there is a high demand for this function.


However, since I dont have my WRX yet.. Im wondering if someone can share with us (if it is possible to see) which color wire goes to which pin hole on the 4 pin connector? If it isnt visible, and someone out there has already cut theirs it would be great if they could use a multimeter or conductivity tester to see which color wire goes to which hole. <--- or maybe someone will volunteer for the community!!
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