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Thread: Extend Factory Head Unit to the Trunk - A Tutorial Reply to Thread
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Topic Review (Newest First)
01-16-2018 05:28 PM
keep_hope_alive
Quote:
Originally Posted by Gearhead82 View Post
I'm liking the idea of the single din. However I just noticed that the 16/17 have the USB port mounted in the upper pocket instead of the lower pocket like the 13-15 so it would take a little more work to remove or relocate the port. I also already have a decent Pioneer double din so I'd have to sell it and find a single din, probably something like the DEH-80PRS. But I grabbed the pics from your single din work and maybe I'll go talk to a shop to see what my options are. I appreciate your knowledge and willingness to share it!
You should only need the USB for loading background files if you plan on using the aftermarket for music. You can disconnect the port in seconds as it should just unclip from the pocket you're cutting up anyway. The cabling should reach the lower pocket so you can remount it there.

I'm happy to share what I experience tearing into cars, that's the beauty of forums! Keep me posted on your progress.
01-16-2018 02:03 PM
Gearhead82
Quote:
Originally Posted by keep_hope_alive View Post

The lower pocket HU wasn't that difficult, but certainly time consuming and mine still isn't perfect yet. A shop could mold that pretty easily if you take them the pocket and the radio then show them a few of the pics I took to give them the general idea. Having the pocket cover held with magnets for a stealth look is super handy but requires the HU be recessed quite a bit. You could save some hassle by letting them bring the lower HU out a few inches to clear the rear surfaces that I had to cut.
I'm liking the idea of the single din. However I just noticed that the 16/17 have the USB port mounted in the upper pocket instead of the lower pocket like the 13-15 so it would take a little more work to remove or relocate the port. I also already have a decent Pioneer double din so I'd have to sell it and find a single din, probably something like the DEH-80PRS. But I grabbed the pics from your single din work and maybe I'll go talk to a shop to see what my options are. I appreciate your knowledge and willingness to share it!
01-16-2018 12:02 PM
N4SML
Quote:
Originally Posted by keep_hope_alive View Post
I'm curious how the new capacitive touchscreens take off, it's about time!

I have the connector diagrams for the three units offered in 2017. They are categorized within the Honda service site as "basic", "display", and "nav". The basic model has three wires in the D harness, and the other two have 11 wires. Same purpose as I noted above. Pull your head unit and look at the back so you know what you're working with and let me know what diagrams you need.
arempee26 I think you have the exact same model/variant Sport as me. 2016/17 with factory Bluetooth, basic 4-speaker system w/out touchscreen. No factory XM or AMP installed. If so, do you know which D harness you have as mentioned by keep_hope_alive above? Haven't pulled my radio out yet due to inclement weather. Just trying to get an idea, but obviously I need to pull the FHU and verify at some point.
01-16-2018 10:45 AM
keep_hope_alive
Quote:
Originally Posted by Gearhead82 View Post
I believe the ‘16/17 have an additional wire to control the different rear view camera views. The ‘13-15 didn’t have the option to change views like the 16/17 do. I noticed on the wiring diagram there is a wire labeled “CAMERA BIT0” mode select signal for rear view camera. This wire might need to be extended to keep the camera from defaulting to one of the funky views but I’m not sure. I’m also not sure if that’s part of the “D” connector or a different one.

I bought a donor head unit and extracted all the connectors and harnesses that I need to extend my ‘17 Sport hu to the trunk but I’m starting to lean more towards burying the hu in the dash or installing a single din in the lower pocket like keep_hope_alive did. I’m not super comfortable fabricating the lower pocket to fit the single din and having it look good though. I may bring that lower pocket into a local stereo shop and see what they’d charge to install the single din in it.
The premium models in 13-15 had the nicer rear camera with different modes as well, but not for the Sport. The difference is a 6-pin harness or an 8-pin harness.

I like the idea of relocating the HU to the trunk. The solution really depends on what a person wants to live with. The lower HU is easy, allows full factory look and function (when fed through AUX it also allows factory BT if you desire). I mostly listen to CD's so a modern DD head unit is full of features i don't need. I also want compatibility with my PXA-H800 so it limits the head units I would want to run.

The lower pocket HU wasn't that difficult, but certainly time consuming and mine still isn't perfect yet. A shop could mold that pretty easily if you take them the pocket and the radio then show them a few of the pics I took to give them the general idea. Having the pocket cover held with magnets for a stealth look is super handy but requires the HU be recessed quite a bit. You could save some hassle by letting them bring the lower HU out a few inches to clear the rear surfaces that I had to cut.

I have been all over the place with configurations. At this point, I am proceeding with getting the 2015 touchscreen to be fully functional in my 2014 Sport then seeing how it does in IASCA this year, with the lower HU as a backup if I'm not happy.
01-16-2018 10:23 AM
Gearhead82 I believe the Ď16/17 have an additional wire to control the different rear view camera views. The Ď13-15 didnít have the option to change views like the 16/17 do. I noticed on the wiring diagram there is a wire labeled ďCAMERA BIT0Ē mode select signal for rear view camera. This wire might need to be extended to keep the camera from defaulting to one of the funky views but Iím not sure. Iím also not sure if thatís part of the ďDĒ connector or a different one.

I bought a donor head unit and extracted all the connectors and harnesses that I need to extend my Ď17 Sport hu to the trunk but Iím starting to lean more towards burying the hu in the dash or installing a single din in the lower pocket like keep_hope_alive did. Iím not super comfortable fabricating the lower pocket to fit the single din and having it look good though. I may bring that lower pocket into a local stereo shop and see what theyíd charge to install the single din in it.
01-16-2018 08:00 AM
N4SML
Quote:
Originally Posted by keep_hope_alive View Post
I'm curious how the new capacitive touchscreens take off, it's about time!

I have the connector diagrams for the three units offered in 2017. They are categorized within the Honda service site as "basic", "display", and "nav". The basic model has three wires in the D harness, and the other two have 11 wires. Same purpose as I noted above. Pull your head unit and look at the back so you know what you're working with and let me know what diagrams you need.
keep_hope_alive will do. And thank you again for the help! I'm hoping I will be able to pull the radio in the next month or so. With the low temps here, I have procrastinated doing so, lol.
01-16-2018 05:48 AM
keep_hope_alive
Quote:
Originally Posted by N4SML View Post
keep_hope_alive thanks for the reply! I should have mentioned I have a 2017 Sport with a basic non-touchscreen and without any type of factory amp - just your basic 4 speaker system. Maybe Honda changed something slightly in the 2016/2017s because all of the schematics I have come across are exact with the exception of the D harness. As I get further in my build, I will post pics.

I was looking to add the new Sony AX200, but Sony just announced they will be releasing a full touchscreen model (XAV-AX5000) that will have a capacitive touchscreen. This will emulate an iPhone or Samsung's touchscreen function, so I imagine it will be a huge improvement over Sony's traditional resistive touchscreens in the AX lineup. Doesn't come out until sometime this Spring, so in the meantime, I am getting ahead and work to build my harnesses to extend my FHU to the trunk as Terry TMVB had done.

Terry seemed like a great guy! He was a fellow Naval Officer who actually lived in the same metropolitan area as me. I have come across several people since his passing who had served under his command, and they all stated he was one of the most genuine and caring people they had ever worked for. I can easily see that part of his character by all his posts here on the forum. I was able to briefly talk to him via FB in May of 2017 and he was willing to lend a hand without hesitation. Thankful for all his efforts and prayers for his family!

I'm curious how the new capacitive touchscreens take off, it's about time!

I have the connector diagrams for the three units offered in 2017. They are categorized within the Honda service site as "basic", "display", and "nav". The basic model has three wires in the D harness, and the other two have 11 wires. Same purpose as I noted above. Pull your head unit and look at the back so you know what you're working with and let me know what diagrams you need.
01-16-2018 04:59 AM
N4SML
Quote:
Originally Posted by keep_hope_alive View Post
Touchscreen is different than Basic. In every way, they are different. The primary difference is everything is external in the touchscreen (BT, HFL, ANC, FM, XM, Amplifier, etc.). Connecting to these external modules is why there are more harnesses and more wires in each harness.

Terry relocated a basic non-touchscreen that only had 3 wires in the D harness. Those wires were GA Bus +, GA Bus -, and shield.

If your Touchscreen D harness has 11 wires, it is communicating with the Hands Free Link module and XM module as well. The same 3 wires as the basic unit would be affected and you can ignore the rest.
keep_hope_alive thanks for the reply! I should have mentioned I have a 2017 Sport with a basic non-touchscreen and without any type of factory amp - just your basic 4 speaker system. Maybe Honda changed something slightly in the 2016/2017s because all of the schematics I have come across are exact with the exception of the D harness. As I get further in my build, I will post pics.

I was looking to add the new Sony AX200, but Sony just announced they will be releasing a full touchscreen model (XAV-AX5000) that will have a capacitive touchscreen. This will emulate an iPhone or Samsung's touchscreen function, so I imagine it will be a huge improvement over Sony's traditional resistive touchscreens in the AX lineup. Doesn't come out until sometime this Spring, so in the meantime, I am getting ahead and am working to build my harnesses to extend my FHU to the trunk as Terry TMVB had done.

Terry seemed like a great guy! He was a fellow Naval Officer who actually lived in the same metropolitan area as me. I have come across several people since his passing who had served under his command, and they all stated he was one of the most genuine and caring people they had ever worked for. I can easily see that part of his character by all his posts here on the forum. I was able to briefly talk to him via FB in May of 2017 and he was willing to lend a hand without hesitation. Thankful for all his efforts and prayers for his family!
01-15-2018 10:04 PM
keep_hope_alive
Quote:
Originally Posted by N4SML View Post
Before Terry passed, I know he mentioned that when he extended the D connector there were three wires. The D connector has several wires. Does anyone know which exact three in the D connector need to be extended? If I overlooked it somewhere, I apologize in advance.
Touchscreen is different than Basic. In every way, they are different. The primary difference is everything is external in the touchscreen (BT, HFL, ANC, FM, XM, Amplifier, etc.). Connecting to these external modules is why there are more harnesses and more wires in each harness.

Terry relocated a basic non-touchscreen that only had 3 wires in the D harness. Those wires were GA Bus +, GA Bus -, and shield.

If your Touchscreen D harness has 11 wires, it is communicating with the Hands Free Link module and XM module as well. The same 3 wires as the basic unit would be affected and you can ignore the rest.

If there are questions on this process, I can answer them. Just mention me, I am active in forums again after a hiatus. I talked with Terry a lot during the relocation effort. He will be missed, he was a good dude. His video is very well done and it is good to see other members contribute on part lists.


Quote:
Originally Posted by Accord Man 1 View Post
TMVB,
Thanks for this write up! I have the touring trim and want to extend the factory head unit to the trunk. My headunit has nav. Will nav be preserved in this method? Thanks.
Quote:
Originally Posted by Lashlee View Post
Unfortunately Terry passed away earlier this year so he won't be able to answer you.

In general the nav would still continue to work as long as you extend all of the wiring, including the GPS antenna. Depending on how you do it, it may still work if you leave the control panel up front.
Leaving the lower control unit would allow you to still access most of the features in the head unit. But you will need to decide what features you want to keep and customize the harness extension. The process will be much more involved than what is shown for the basic head units. To start, you will need to decide which wires you are keeping in each harness. You will need the connector diagrams for your specific year/trim. I have them for some, but not all, possible options for 9th gen. I did get all of the 2014 connector diagrams for Navi units and modules.
01-13-2018 11:50 AM
N4SML Before Terry passed, I know he mentioned that when he extended the D connector there were three wires. The D connector has several wires. Does anyone know which exact three in the D connector need to be extended? If I overlooked it somewhere, I apologize in advance.
12-27-2017 10:02 AM
Lashlee Unfortunately Terry passed away earlier this year so he won't be able to answer you.

In general the nav would still continue to work as long as you extend all of the wiring, including the GPS antenna. Depending on how you do it, it may still work if you leave the control panel up front.
12-24-2017 11:34 PM
Accord Man 1 TMVB,
Thanks for this write up! I have the touring trim and want to extend the factory head unit to the trunk. My headunit has nav. Will nav be preserved in this method? Thanks.
12-15-2017 03:48 PM
ITR1102 After I sourced all the plugs to make the extension harnesses I put the project on hold. I could really use a pickup truck and thereís no chance my wife will let me trade the Pilot in. I didnít want to touch the car until I know for sure if Iím going to keep it or trade/sell it off in another 6 months.


Sent from my iPhone using Tapatalk
08-18-2017 08:30 PM
TMVB
Quote:
Originally Posted by timeshifter View Post
Hi TMVB just checking in to see how you've been doing, is your install still running great... has anyone else done this install to the trunk yet?
Working flawlessly - very glad to have done it.

Several discussed and even purchased stuff to do the same but I haven't heard of anyone actually following through.
08-18-2017 07:57 PM
timeshifter Hi TMVB just checking in to see how you've been doing, is your install still running great... has anyone else done this install to the trunk yet?
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