Contact us
Close contact box

Scosche CGM02 Wiring Interface

Allows you to connect a new car stereo and retain the factory amp in select 1986-up GM vehicles

Item # 142C4GM02

The Scosche CGM02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1986-up...

Find what Fits your car

The Scosche CGM02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1986-up...

Ask a question

Item # 142C4GM02

Ships free

In Stock
C$42.99
Add to wishlist

About the Scosche CGM02 Wiring Interface

The Scosche CGM02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1986-up General Motors vehicles with premium factory systems. The package includes the OEA-4 adapter and a GM-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 CGM02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1986-up General Motors vehicles with premium factory systems. The package includes the OEA-4 adapter and a GM-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
READ LESS

What's in the box:

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

Customer reviews

Loading reviews...

Scosche CGM02 Wiring Interface reviews

Average review:

20 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Scosche CGM02 Wiring Interface

Crutchfield customer from Downingtown, PA on 8/8/2018

1990 Cadillac DeVille

Verified customer (What's this?)
Verified employee purchase (What's this?)

Sure makes the install easier

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

1996 Z28 w/Bose system

marc from Bismarck, MO on 4/23/2018

1996 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

From inquiry to purchase I had exceptional service. I had many questions and was treated like a long time customer. Crutchfield offered the CGMO2 wiring interface for my 1996 Camaro Z28 with the 5 speaker Bose system. Many people told me installing a aftermarket radio in this vehicle couldn't be done without rewiring every speaker and bypassing the factory amps.They couldn't of been more wrong.After speaking with Buddy from Crutchfield I found out scosche offered this speaker interface that would make my install near effortless.The interface came with everything I needed to wire my new radio harness up and plug in. Adjust the gain screws on interface and I was was done. I'm super happy I didn't have a wiring nightmare on my hands. Buddy was very helpful and the interface was a decent price. Tech service was offered at any time during my install but wasn't needed. I would say all in all it was quick and painless. Crutchfield is now my #1 go-to place for all my electronic needs.

Pros: Made my install simple

Cons: NONE

Crutchfield response on
Customer review photo Customer review photo

0 of 0 found this helpful

Scosche CGM02 Wiring Interface

Crutchfield customer from Minneota, MN on 12/14/2017

Verified customer (What's this?)
Verified employee purchase (What's this?)

It works Great. Installation was simple and easy

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Easy to install. Works great! Nice price.

Brian from Liberty, MO on 9/18/2017

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Was pretty easy to hook up and worked as advertised. I initially turned the four channels all the way down as I didn't know what to expect. It almost sounded like there was a problem with the unit at the lowest levels - was getting a crackling noise. However, after turning the four channels up, that noise went away and now it works like expected.

Pros: Easy to install. Easy to adjust.

Cons:

Crutchfield response on

0 of 0 found this helpful

Integrate a new deck for your Bose stereo

Jason from Florence, AL on 8/5/2017

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Took my 1995 Z28 Comaro to a professional installation shop for a new deck for my bose system. Waited an hour and a half and they return and tell me they have a problem. Can't connect the new deck to my bose system. They say it will burn up the new deck. Then they give me two options. Rewire the speakers, bypassing the bose amps or get a used or refurbished bose deck to go back in. They did not know about the third and best option. The Scosche Wiring Interface. Luckily I did not believe that there was not another way. After researching online reading multiple threads with the same problem, they all pointed to Crutchfield for the wiring interface. After the speedy delivery, I brought the car back to the shop and educated them about about this wonderful product. They made the install and it works perfect. Could not be happier.

Pros: None that I'm aware of.

Cons: Let's you keep your awesome Bose system with a new more awesome deck of your choice.

Crutchfield response on

1 of 1 found this helpful

Scosche CGM02 INTERFACE

Dedrick from GA on 4/21/2017

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

The representative gave me the right wiring harness, and does what it suppose to do with no problem. It was easy to install and if you need help there is always crutchfield representative waiting on for you to call. Everything sounds great, thanks crutchfield .

Pros: Allows aftermarket head unit installation with any high price system like the Bose, Mongoose, etc.

Cons: None at all.

Crutchfield response on

0 of 0 found this helpful

Interface

Tyler from Indiana on 1/14/2017

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Product does exactly as described. It allows the correct ohms to run to the stock bose speakers. You will have to adjust the ohms accordingly to the speakers. Easy setup.

Pros: Allows for aftermarket head unit with stock bose system.

Cons: Bulky very little room to put back in dash. But works.

Crutchfield response on

1 of 1 found this helpful

Wiring harness conversion was painless;y easy

Lew from Saxonburg, PA on 10/13/2016

Verified customer (What's this?)
Verified employee purchase (What's this?)

The wiring harness conversion was painlessly easy. I didn't want to cut wires & with Crutchfield's help & expertise it went great. See you next time I have audio - visual need.

Pros: I didn't want to cut wires & with Crutchfield's help & expertise it went great

Cons: None... perfect fit

Crutchfield response on

0 of 0 found this helpful

just what I needed but want more

Matt K from beaverton, OR on 3/20/2016

1996 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

i have a 1996 z28. it has the U1T DELCO BOSE 5 speaker factory system. from the factory, this car has two amps integrated to each front full range door speaker, two NON FULL RANGE MIDBASS In the rear sear side panels, and a single 6 inch 2 ohm subwoofer in a very strange "Echobox" As Bose calls it located in the drivers rear corner. ive researched this setup for nearly 2 months and this is how the car comes. 1993-1996 cars with a single rear speaker grille on the drivers side tells you have this option. this is for camaros though. MUST use this adapter to use an aftermarket deck or you will end up trying to send amplified power to an amplifier. (since every single speaker had its own amp you must convert the output from the headunit to signal information. (line level): Crutchfield is the only site that even led me to why my deck wouldnt work even though i bought all the "correct" harnesses for the vehicle. you will get power but no sound. this interface is great but so much more isnt known about these. overall its perfect. sidenote: the rear speakers are not full range and you can add aftermarket speakers up front with no mods. the rear speakers are NOT full range and are midbass speakers only. the amps for the rear speakers and the sub are located inside the Bose echobox under the drivers rear hatch trim cover opposite the spare tire.

Pros: allows use of aftermarket head unit but keep stock system operation.

Cons: could be of better quality. took 2 months to find i needed one of these. dont forget the pink wire on the car is the bose relay power wire which turns on the amps.wish more features available.

Crutchfield response on

1 of 1 found this helpful

Works as advertised

Jesse from lexington, KY on 3/16/2016

1994 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

94 Camaro with Bose factory sound. Interfaced successfully with my OEM single plug harness and new Dual receiver. It works just fine. Fully functional. Great product to avoid doing the slice and dice on your harness to bypass the factory amps, trust me because I do that all the time.

Pros: Retain your factory amp and speakers and integrate a modern head unit into the vehicle seamlessly.

Cons: None, it werks!

Crutchfield response on

0 of 0 found this helpful

Scosche CGM02 Wiring Interface

Greg H from Cleveland, OH on 1/28/2016

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Easy instructions and perfect fit

Pros: Allowed me to use the existing Bose amps with a new stereo head unit

Cons: None, included all items needed to successfully interface the new unit with existing wiring

Crutchfield response on

0 of 0 found this helpful

Great harness

William from Alger, Mi on 9/13/2015

Verified customer (What's this?)
Verified employee purchase (What's this?)

This harness works great. You need to hook the blue wire marked power antenna to the blue wire on your head unit. That powers the bose amp, otherwise you will have no sound.

Pros: Quick and clean hookup

Cons: Explain the blue wire to fire the bose amp.

Crutchfield response on

0 of 0 found this helpful

Never disappointed

Breff from Minneapolis, MN on 11/30/2014

1996 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Everything fit like a glove and wiring kit makes it so easy.

Pros: Always great service ad products

Cons:

Crutchfield response on

1 of 1 found this helpful

Scosche CGM02 Wiring Interface

Al from Farmville, NC on 7/12/2014

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

Easy and worked perfectly.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Scosche GM adapter

Jack from Palos Verdes,CA on 3/26/2014

Verified customer (What's this?)
Verified employee purchase (What's this?)

A perfect fitting adapter.

Pros: Does the job without a problem

Cons: none

Crutchfield response on

0 of 0 found this helpful

Scosche CGM02 Wiring Interface

BobT from Carrollton, GA on 12/20/2012

1994 Chevrolet Camaro

Verified customer (What's this?)
Verified employee purchase (What's this?)

The Delco Bose in my '94 Camaro was always awful, and I jumped at the chance to replace it without having to change the speakers. I knew the adapter was not harness to harness and it was a pain to attach all the wires. The system sounded great after I realized that the blue wire was needed. The self powered speakers actually are an exterior amp, so I had to pull the unit from the dash and attach the amp wire (my fault.) After a couple of weeks of amazing sound the rear speaker quit. It's one speaker, with left and right wires attached, along with the grounds. I pulled the head unit again and found that when I touched the crimped connectors on the adapter, the rear speaker came on. I squeezed all the crimps for their entire length and got no more faults when wiggling the wires. I replaced the head unit and was fine until the next morning; the rear was dead again. Pulled the head unit and noticed that when I wiggled the rear speaker wires on the adapter itself I got intermittent sound. I then discovered that if I turned the adjustment screws on the adapter fully clockwise for the rear, I got some sound from the rear. I had to turn the adjustment screws for the front fully counter-clockwise to be able to turn the volume up enough to hear the rear speaker at normal volume. I buttoned it up and was pleased that I had finally figured it out. It again sounded great but only until the next morning. It sounds fine with just front speakers, I'm thru! UPDATE: 12/31/12 I previously suspected this adapter was causing intermittent problems, but have traced my problem to a bad rear amp/speaker assembly. The front speakers are fine by themselves until I can get another rear unit; I do not want to replace the original speakers because it requires all new wiring. Bless the Scosche kit for avoiding that. A tip for '94 style Camaro's. Plug the new wiring harness into the original plug and route the wiring to the side and then down in the pocket below the radio. Plug in the unit when you see a clear path to slide it in. The Scosche and all that wiring take up a lot of space.

Pros: Lets you use your Bose speaker(s).

Cons: Difficult to wire, maddening to to troubleshoot.

Crutchfield response on

5 of 5 found this helpful

GM Factory System Integration Adapter

John C. from Melbourne, Fl on 5/18/2012

1991 Chevrolet Caprice

Verified customer (What's this?)
Verified employee purchase (What's this?)

Worked in my 1991 Chevy Caprice. It is awesome! My audio never sounded so good and I got to use my Bose speakers.

Pros: Save a couple of bucks taking advantage of existing sound components, less work, not removing everything and rewiring.

Cons: Adjusting the gain with your dash partially disassembled, but not really a huge issue. It's not like you have wires all around hanging.

Crutchfield response on

2 of 2 found this helpful

Vette Bose Replacement made easy

Eric from Tampa Bay on 2/8/2009

1996 Chevrolet Corvette

Verified customer (What's this?)
Verified employee purchase (What's this?)

Absolutely great product. Made the install on the Alpine IDA-X300 quite easy. One thing to take note, make sure to make the harness about 4' longer. The harness you need to plug it into is under the rear storage compartment on C4 corvettes. So make sure to get 100' of 18 gauge wire, you'll have about 18 wires you'll need to add 4' to. I also recommend removing the passenger seat to make it easier to route the harness to the rear storage compartment. You can also remove the old radio control unit and the foam to add more storage room for any roadside assistant equipment you may carry (I now house a mini-air compressor, tire plug kit, tools, and a flash light UNDER the storage tray). Oh, and the bose speakers have never sounded so good. I lost a tad bit of bass, but very very little. I may just need to do some more adjustments to the sound levels. Good luck and you won't be happier if you want to keep your stock speakers.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

OEM Amplifier Intergration V.4

Thomas from Honolulu, Hawaii on 3/2/2008

1995 Chevrolet Corvette

Verified customer (What's this?)
Verified employee purchase (What's this?)

This is the best product out there. I have a 1995 Corvette with the Bose sound system. All I had to do is install the Player Head. and make a wire harness with the alpine wire connector and the OEM amplifier Intergration V.4 Wire connector. Because The corvette Radio head is a control unit and the radio receiver in the rear part of the car, behind the right passenger seat. I ran wires under the seat and through the carpet to the back floor hatch. I plugged the OEM wire connectors and the car connectors and It worked. Also Connect the the blue wire on the OEM Amp connector to the Remote Turn-On wire on the Alpine Player. This will control the Power antenna and Factory Amp on the car. Don't connect the Power Ant wire on the player. The OEM Amplifier Intergration system is Fully Adjustable to get the best sound with you factory system.I shopped All over in Hawaii. And Everone I talk to said" I had to rewire the whole system and they were wrong". My car sounds great. You will not be disapointed. Also Shop Crutchfield, they have the Best Service and Free Shipping to Hawaii. I saved over $500.00 Because of the great service and tech support at Crutchfield.

Pros:

Cons:

Crutchfield response on

6 of 6 found this helpful

thank you Scosche

no from Savannah, GA on 1/31/2008

1990 Chevrolet Corvette

Verified customer (What's this?)
Verified employee purchase (What's this?)

This adapter works flawlessly, and saves the cost and time of completely re-wiring you vehicle. I used this adapter in a 1990 Corvette with the Bose Gold system to replace the head unit. I'm guessing as most of you with a Bose system already know, re-wiring your car is almost the only option you have, this thing is a life saver......... Very easy install and setup, compact so its easy to hide, works flawlessly, saves you from re-wiring you entire vehicle, would definitely recommend it to anyone who just wants to change out the head unit.

Pros:

Cons:

Crutchfield response on

21 of 23 found this helpful

Verified customer (What's this?)
Verified employee purchase (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

More details on the Scosche CGM02 Wiring Interface

Stacey B.

Product Research

Features

Compatibility: The OEA-4 (model C4GM02) is a non-electronic interface that allows an aftermarket high-power stereo to integrate into select 1986-96 General Motors 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 a white rectangular Molex plug. There are 5 additional wires coming from the white plug that should be spliced to the receiver's wiring harness. The Molex plug end is molded to match with the factory wiring harness. Crimp caps are provided for wire splices.

Loading accessories...

Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Came as part of package [ herbert  Jul 24, 2018 ]
A
was included in installation kit [ Douglas  Apr 07, 2018 ]
A
I have the factory 5 speaker bose system in my 95 camaro z28. No longer am getting sound to speakers so its time to swap the HU out for my aftermarket single din. Hopefully this harness adapter will allow me to use the factory speakers with the aftermarket HU which im sure it will. If it works, thats a great deal only needing to buy a simple plug in play harness for it. Bose is crap, scosche is where its at! [ jordan  Aug 31, 2017 ]
A
I got a camaro with a bose system, and who ever had it before me put in an aftermarket cd player and it sounds like crap, and after research this seems the best bet to get from aftermarket to bose system [ Michael  Jul 31, 2017 ]
A
direct fit and easy to adjust [ Scott  Jun 26, 2016 ]
SHOW MORESHOW LESS

Loading articles...

TOP