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Scosche CHA02 Wiring Interface

Allows you to connect a new car stereo to the factory amp in select 1987-up Honda and Acura vehicles

Item #: 142C4HA02

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4 Reviews | Ask Questions

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The Scosche CHA02 wiring interface allows you to integrate a high-powered aftermarket receiver into select 1987-up Honda and Acura vehicles with premium factory systems. The package includes the OEA-4 adapter and a Honda-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. You can also call an Advisor for more information.

Scosche CHA02 Wiring Interface Reviews

Average Customer Review:

4 Reviews


Written by: Anonymous from El Paso, TX on February 27, 2015

1994 Acura Legend GS
Crutchfield Customer Review (What's this?)

Works great missing some information such as on the amp and antenna relay switch the plug is marked "remote only" making you think it's the receiver for the remote but it's actually the antenna remote and amp, should be clarified better and the adjustment screws for the amp should not be so easily stripped

Pros: Fits great

Cons: Strip easily


Written by: Fredo from San Francisco, CA on October 23, 2014

1993 Honda Accord SE
Crutchfield Customer Review (What's this?)

This wiring harness made the install of my new Pioneer deck that much easier. This harness was specifically made for those cars with the Bose stereo package. I was able to connect my stock Bose amp with out cutting into the vehicle harness.

Pros: Easy installation


Scosche CHA02 Wiring Interface

Written by: Skyrida from Pittsburgh on February 3, 2013

1991 Acura Legend
Crutchfield Customer Review (What's this?)

This product was great. My brother has a 91 Acura, and I bought an aftermarket head unit to put in it, and this integration adapter worked perfectly. I knew that he had the bose sound system, but this was the perfect fix.



Scosche CHA02 Wiring Interface

Written by: David C from Pasadena, CA on July 21, 2012

1994 Acura Legend LS
Crutchfield Customer Review (What's this?)

Easy to connect and install. A well put together part. Nice job Scoche!

Pros: easy to use and install.

Cons: None

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 white rectangular connector)
  • Flat-blade screwdriver (attached to interface module)
  • 13 Crimp caps
  • Instruction sheet

Product Research


Compatibility: The OEA-4 (model C4HA02) is a non-electronic interface that allows an aftermarket high-power stereo to integrate into select 1987-95 Honda and Acura 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.

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