Scosche CNN02 Wiring Interface

Allows you to connect a new car stereo and retain the factory amp in select 1989-up Nissan and Infiniti vehicles

Item #: 142C4NN02

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11 Reviews

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The Scosche CNN02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1989-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.

  • 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, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research

What's in the box?

Download owner's manual

  • OEA-4 OEM Amp interface (with 8-wire input with bare wires/8-wire output with 2 yellow/white rectangular connectors)
  • Flat-blade screwdriver (attached to interface module)
  • 13 Crimp caps
  • Instruction sheet

Product Research


Compatibility: The OEA-4 (model C4NN02) is a non-electronic interface that allows an aftermarket high-power stereo to integrate into select 1989-97 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 yellow rectangular Molex plugs. There are 5 additional wires coming from one of the white/yellow plugs and 2 wires from the other white/yellow 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.

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Scosche CNN02 Wiring Interface Reviews

Average Customer Review:

11 reviews
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Written By John, Connecticut on Tuesday, December 23, 2014

Crutchfield Customer Review (What's this?)

This worked great on a 1994 Maxima, allowing me to keep the existing amplified Bose speakers.

Pros: Does the job. The best part is that Crutchfield pre-attaches the correct connector for your car, so you only have to connect the radio to this and you are good to go.

Cons: A little larger than expected.


Written By Sewbike, Olympia, WA on Monday, September 29, 2014

Crutchfield Customer Review (What's this?)

The wiring harness fit and works as described by Crutchfield.

Pros: It fit no problem.

Cons: None

Thank goodness for this product

Written By MB, Forestville, MD on Tuesday, December 31, 2013

Crutchfield Customer Review (What's this?)

I have a 1992 Nissan Maxima that is still running strong. Finally bought a new stereo, after learning that I did not have to get rid of Bose Speakers (who would do that? LOL) this adapter made it possible. Great product

Great product

Written By sissy, Toccoa,GA on Sunday, October 13, 2013

Crutchfield Customer Review (What's this?)

This adapter has perfectly colored wires that makes it easy for a DIY project and Crutchfield kept their word on shipping it right away i was shocked that it got here so fast!

Pros: Easy to wire up

Easy to use.

Written By GeneM, Lawrence, KS on Monday, September 30, 2013

Crutchfield Customer Review (What's this?)

Very useful adapter. Adapter worked perfectly in my Nissan using my factory Bose speakers. Excellent feature of adjustable gain. Instructions were good but could have been a little clearer.

Pros: I can use factory Bose speakers. Easy installation and setup. Adjustable gain.

Cons: Instructions could be better.

Scosche CNN02 Wiring Interface

Written By Allen G., Greenville,SC on Thursday, August 09, 2012

Crutchfield Customer Review (What's this?)

Worked great with the factory presets

Insufficient instructions for 300Zx + Bose

Written By Justin L, Palatine, IL on Wednesday, October 26, 2011

Crutchfield Customer Review (What's this?)

Works well, just needs clearer instructions for the 300Zx + Bose system.

Pros: The adapter works just fine once you get all the wiring worked out...

Cons: The wiring guide isn't exactly right... I had to call twice to get it sorted out that the blue and blue/white wires on the vehicle side had to be connected to the blue/white on the radio side...

it works

Written By j30 owner, ocean county, NJ on Monday, January 24, 2011

Crutchfield Customer Review (What's this?)

Was not sure if this would solve my problem. I did a lot of research and got conflicting
results, this device did the trick. I was able to use the Bose factory system [amp and
speakers] with the clarion reciever I bought.
Thank You Crutchfield

I hope this review helps someone else with their decision.

Scosche CNN02 Wiring Interface

Written By NissMax, Long Island, NY on Friday, November 05, 2010

Crutchfield Customer Review (What's this?)

Extremely helpful with the installation. Adjusting for each of my BOSE amps was as simple as described in the instructions. The only issue/problem was when I could not get any sound despite carefully following the instructions and triple-checking my car's wiring. I had to ignore the "warning" about connecting both the amp wire and the power wire. The instruction was to rely on the blue wire for both the power antenna and the amp (BOSE system). When I did that, the power antenna worked but no sound. When I connected the "amp" wire so that it would be powered by the original amp wire in my car, everything worked correctly.

It works!

Written By wearezz, Phoenix, AZ on Wednesday, June 03, 2009

Crutchfield Customer Review (What's this?)

Installed this adapter into my 300zx with the factory BOSE system. I was leary of this working based upon the other review posted. Crutchfield assured me it would work and it does. I didn't want to replace the Bose speaker system because I love the sound. Now the Bose sound even better with the new head unit and this adapter.

300zx 2+2 with Bose Speakers

Written By Jorge, Lompoc CA on Tuesday, November 11, 2008

Crutchfield Customer Review (What's this?)

It doesn't work!
Thank God for the Super customer service that Crutchfield provides. When my Bose head unit called it quits, I spent a lot of time doing research to get it fixed or replaced. With the huge price of having the unit fixed I decided to pay less and get more for my money. So I opted for a replacement, (Sony with bluetooth) however the Bose speakers are not compatable with non Bose head units. This adapter seemed like the answer to my prayers until I installed it. The sound was terrible, very low and muffled at normal volume, and with the volume all the way up, very distorted. I will be sending this back. In the end I found an amp that will work with Bose speakers (2 ohm vs 4 ohm). The amp will work with both ratings. It works great. When I finish the install I will have the Sony head unit with the Bose speakers with 100 watts per channel!!

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