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PAC ROEM-GM21 Wiring Interface

Connect a new car stereo and retain the factory amplifier in select 1986-96 General Motors vehicles

Item # 541GM21

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Item # 541GM21

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Since 1974

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About the PAC ROEM-GM21 Wiring Interface

Bob Bihlmayer

PAC ROEM-GM21 interface

PAC's ROEM-GM21 radio replacement interface lets you replace the factory radio in select 1986-96 General Motors vehicles, without losing the amplified sound system. The interface's design minimizes noise and static. Warranty: 1 year.

What's in the box:

  • Radio replacement interface module
  • Vehicle harness
  • Radio harness
  • Instructions

Customer reviews for PAC ROEM-GM21 Wiring Interface

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More details on the PAC ROEM-GM21 Wiring Interface

Stacey B.

Product Research


Radio Replacement Interface: The PAC ROEM-GM21 facilitates the replacement of the factory-installed Delco/Bose radio in select GM vehicles with an aftermarket stereo, while retaining the function of the factory amplified audio system.

Vehicle Compatibility: The PAC ROEM-GM21 is compatible with the following GM vehicles featuring a factory installed premium Delco/Bose audio system.

Make Model Year
Buick Lesabre 1990-1994
Park Avenue 1990-1994
Roadmaster 1991-1994
Cadillac Deville (coupe) 1990-1991
Deville 1992-1993
Eldorado 1990-1991
Fleetwood 1990-1993
Seville 1990-1991
Chevy Camaro 1999-2003
Caprice 1991-1996
Corvette 1990-1996
Impala 1994-1996
Lumina 1995-2001
Lumina APV Van 1990-1996
Malibu 1997-2000
Monte Carlo 1995-1999
Silverado 1998-1999
Suburban 1995-1999
Tahoe 1995-1999
Sierra 1998-1999
Yukon 1995-1999
Youkon XL 1999

Adjustable Gain: This 4-channel radio replacement interface will allow your new aftermarket stereo's output to be adjusted to the input requirements of the existing factory installed amplifier, providing 2:1 gain and infinite attenuation.

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Customer Q&A

3 questions already asked

I just wired a radio in for my camaro and it comes on with no sound is this a special harness that plug and play that will solve my no sound problem?
ray young  Jan 22, 2023
1 answer
Greetings Ray, and thank you for your question. I would question, is it the right harness for your Camaro. If its is verified by our website, and you have no sound, I'm thinking your vehicle may have a factory amplifier that is not turning on like it should. Double check your wire connections. If you purchased the PAC wiring interface from Crutchfield, you can call our tech support line for assistance. Their number would be on your shipping confirmation email from us. If you purchased the PAC adapter elsewhere, you can call PAC as well for wiring help. If you want to double check to see if in fact you have the right wire adapter, you can call one of our advisors at 800-324-9695.
thomas  Jan 22, 2023 (Staff)
Is this necessary to use when installing aftermarket 6 1/2" speakers in place of the factory Bose?
david  Sep 16, 2022
1 answer
This interface would be only if you were replacing the radio in the select years of vehicles it covers, David. This is the essential piece to the puzzle that will allow you to keep your Bose amp with your new radio! If you are having any issues with install of gear you got from us, make sure and give us a call at 1-888-292-2575 and our Technical Support Specialists can help if you need!
bo  Sep 16, 2022 (Staff)
Will this allow me to keep my bose speakers in my 95 camaro z28 with an aftermarket head unit?
marcus  Mar 09, 2020
2 answers
Yes that is the wiring harness we recommend to interface an aftermarket radio with the factory Bose system in those '95 Camaros. We include it (along with dash kit and antenna adapter) at a discounted price when you purchase a radio. If you have questions, or want help selecting a new radio, you can connect with one of our friendly product advisors for live support here:
casey  Mar 25, 2020 (Staff)
Yes, I just did a swap on my 1993 Z28 with Bose speakers and everything works great. Also, if you're looking for a new head unit, don't get a full size double din, you'll want a slim double din to fit.
david  Mar 23, 2020

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