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Scosche CNN03 Wiring Interface

Allows you to connect a new car stereo and retain the factory amp in select 1994-up Nissan and Infiniti vehicles

139 Reviews | 8 questions - 12 answers

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Overview

Our take on the Scosche CNN03 Wiring Interface

The Scosche CNN03 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1994-up Nissan and Infiniti vehicles with premium factory systems. The package includes the OEA-4 adapter and a Nissan-specific harness. The OEA-4 unit has output-level gain controls for each of its four channels which can be adjusted to properly match the new receiver to the factory amplifier.

The Scosche CNN03 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1994-up Nissan and Infiniti vehicles with premium factory systems. The package includes the OEA-4 adapter and a Nissan-specific harness. The OEA-4 unit has output-level gain controls for each of its four channels which can be adjusted to properly match the new receiver to the factory amplifier.

Note: If you haven't already, please enter your vehicle information or call a Sales Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle.

Details:
  • 4 speaker-level inputs
  • output level adjustments for all four channels
  • works best with high-powered aftermarket receivers
  • dimensions: 3-15/16"W x 15/16"H x 2-1/16"D
  • 1-year warranty

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Quality item, but the directions weren't the best. No color aids for us colorblind folk. Took us a while to figure it out.

Joel, Wisconsin Rapids, WI

What's in the Box:

  • OEA-4 OEM Amp interface (with 8-wire input with bare wires/8-wire output with 2 white/black rectangular connectors)
  • Flat-blade screwdriver (attached to interface module)
  • 13 Crimp caps
  • Instruction sheet
  • Our 60-day money-back guarantee
  • 4 speaker-level inputs
  • output level adjustments for all four channels
  • dimensions: 3-15/16"W x 15/16"H x 2-1/16"D
  • 1-year warranty
Reviews

Scosche CNN03 Wiring Interface Reviews

Average Customer Review(s):

(139 Reviews)
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Hands-on research

Product Research

Features

Compatibility: The OEA-4 (model C4NN03) is a non-electronic interface that allows an aftermarket high-power stereo to integrate into select 1994-up Nissan and Infiniti vehicles with Bose premium factory systems. Please check the Crutchfield Vehicle Selector for compatibility for your vehicle.

Adjustment Gain Controls: Four rotary gain controls (front left, front right, rear left, rear right) are located recessed inside the adapter chassis. There is a small flat-blade screwdriver attached to the adapter's case, and its use is recommended. The controls are very fragile and sensitive, and a slight adjustment will change volume dramatically.

Harnesses: The adapter's input wires are approximately 5-1/2" long with bare ends. These splice to the new receiver's speaker output wires. The adapter's output wires are approximately 11" long and terminate into two white and black rectangular Molex plugs. There are 5 additional wires coming from one of the white/black plugs and 2 wires from the other white/black plug that should be spliced to the receiver's wiring harness. The Molex plug ends are molded to match with the factory wiring harnesses. Crimp caps are provided for wire splices.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Need it for my Nissan Xterra [ Keli  May 20, 2017 ]
It's the wiring kit for my 2004 Infiniti G35. [ Joel  May 14, 2017 ]
necessary for install [ Brent  Apr 07, 2017 ]
this is a absolute must if you are replacing a bose stock system in your car lets you fine tune the amp settings so you can get the most out of your aftermarket deck. [ chris  Apr 07, 2017 ]
Need it to retain my factory amplifier [ Anthony  Mar 28, 2017 ]
Apparently I need this to install in a 99 Infiniti QX4 [ Grant  Mar 26, 2017 ]
To install the aftermarket radio I purchased from you in my vehicle. [ Freedom ElechTech, Attn: Bill Godwin  Mar 24, 2017 ]
For my stereo [ Cameron  Mar 15, 2017 ]
Came with it. [ Lance  Mar 13, 2017 ]
I need this in order to get sound through my speakers cuz i installed a aftermarket radio. [ Jose  Mar 07, 2017 ]
Required to use aftermarket head unit with Bose amplifier installed in a 2004 Infiniti G35. [ David  Feb 27, 2017 ]
I need this for my car to installed my new car stereo! [ Rogelio  Feb 22, 2017 ]
Assumed I would need these. [ Stephen  Jan 12, 2017 ]
I needed this for my G35 stereo upgrade. Crutchfield listed everything I would need to work with a Bose system. [ FARRIS  Dec 16, 2016 ]
was part of package [ Cynthia  Dec 08, 2016 ]
Keeping the factory wiring left untouched and usable makes for a clean professional instal and helps hold value [ Christopher  Nov 25, 2016 ]
i needs this for my bose system [ Glenn Delos  Nov 23, 2016 ]
To maintain the use of the BOSE speakers. [ E  Nov 15, 2016 ]
Turns out, the stereo's performance improves drastically when plugged in [ Nathan  Nov 13, 2016 ]
Quality install. Retain factory wiring harness. [ David  Oct 25, 2016 ]
does exactly what i need it to do to install my aftermarket radio and keep my infinity bose speakers and amp while being able to add a sub and sub amp to my aftermarket radio without all the hacking of my wiring. also will allow me to go back to stock if ever needed one day [ Corey  Oct 25, 2016 ]
Needed so I could keep my factory Bose amp/bass in my 2006 Infiniti G35 sedan with new Pioneer AVH4200NEX stereo. [ Bryan  Aug 04, 2016 ]
added aftermarket radio had loud hiss because the input level was to high going into the factory amplifier. Tried the wiring harness with just RCA jacks and the radio did not have any volume. Hopefully this will solve all the issues. [ John  Jun 21, 2016 ]
Standard procedure for a professional looking, direct-connect application. [ Michael T.  Jun 17, 2016 ]
Great Item For a Great Price!!! [ javier  May 25, 2016 ]
They were recommended by Ringo at Crutchfield Ringo's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=164 [ Jerry  May 19, 2016 ]
After market radio [ AlejandroMartin  May 15, 2016 ]
I am so happy they make a wiring harness that will work with my factory Bose system!It would be a nightmare without having one! [ Kurt  May 03, 2016 ]
required for EZ install [ Doug  Apr 27, 2016 ]
ESSENTIAL!!!!! to install. Turns six hour job into one or two (maybe less....I'm hoping) [ Jim  Apr 19, 2016 ]
Great deal [ Anthony  Mar 25, 2016 ]
Building a time machine lol [ Jeffry  Mar 04, 2016 ]
to correctly interface with earlier purchase of pioneer radio [ Peter  Feb 29, 2016 ]
Need it [ Timothy  Feb 26, 2016 ]
I used the live chat and Abe was able to help me immediately. Great help for a non-tech guy. [ Joseph  Jan 05, 2016 ]
Connecting a new radio needed harness to complete install [ Alicia  Dec 25, 2015 ]
To be able to use the stock Bose amp with a new headunit and speakers [ Henry  Dec 17, 2015 ]

8 questions already asked

Take a look at the grounds again. The BLACK wire on this harness connected to the SHIELDS for the speaker wires and does not establish a solid ground. The factory BOSE in my 03 Altima establishes ground through the radio chassis and that's how these speaker shields find ground. Try attaching the BLACK wire in the harness to both your receiver and a CHASSIS ground of your own....may get your shields grounded properly and solve the issue. [ Mike D.  Dec 13, 2016 ]
Unfortunately that is the nature of the beast. I was an installer for Circuit city for a long time & this was always a problem. The only way to reduce the hiss is to turn the gains down on the Metra 70-7550. What is happening is when you put in your Kenwood the speaker outputs always have a little bit of a signal going to the speakers even if nothing is playing. The factory amp picks up this signal & amplifies it. Garbage in amplified garbage out. I had that problem with the Bose in My Maxima. If you turn those gains down a little then it should reduce your static. [ Cory  May 31, 2016 ]
Did you use electrical tape or the plastic cones with metal in them to clamp the wires inside [ David  May 31, 2016 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Jul 27, 2015 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy  Apr 13, 2015 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Jeff  Nov 03, 2014 ]  Staff
I forwarded your question to an Advisor and they responded with the following: We don't have the Metra 70-7551 listed as the harness for the 2004 G35 despite it being a harness for other Nissan and Infiniti vehicles. The Scosche CNN03 is the only adapter we have listed for that vehicle and will likely resolve the issue. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Apr 22, 2014 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy  Feb 18, 2014 ]  Staff
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility. They will be able to pull up your vehicle, check your headunit, and see if it will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Feb 11, 2014 ]  Staff
It worked for the Bose amp in my 2001 Nissan Pathfinder. [ MATT  Dec 11, 2013 ]
Actually, i may be incorrect about connectors, its been a while since i did my install. it may come with connectors already installed. i think i may have cut those connectors off though, and re attached since i wanted to solder and heat shrink my connections. [ GARRETT J  Dec 11, 2013 ]
yes, it should. the picture shows it with connectors already connected on one side, but it doesnt come with those connectors, those will be whatever connectors you need to connect to the factory connectors behind your factory radio. you basically just wire it inline between the stereo output wires and your speaker wires on the harness adapter you purchase/have. I installed this adapter on my 2002 Infiniti QX4 with bose, and it works great, and was really simple to install. just a matter of wiring it inline between head unit and speakers. Just make sure you test it before tucking everything behind dash. there are little screws on adapter to adjust volume, i had to turn mine almost all the way up. Before adjusting the screws, i could have my head units volume on max, but speakers were not loud at all. It may be different for your G, so just tinker with it before sealing it all up. [ GARRETT J  Dec 11, 2013 ]
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