Contact us
Close contact box

PAC ROEM-GM21A Wiring Interface

Connect a new radio and retain the Bose® system in select 1999-02 GM vehicles

Item # 541GM21A

You want to replace the radio in your GM vehicle, but you don't want to go through the hassle of replacing your...

Find what Fits your car

You want to replace the radio in your GM vehicle, but you don't want to go through the hassle of replacing your...

Item # 541GM21A

Ships free

In Stock
C$69.99
Add to wishlist

About the PAC ROEM-GM21A Wiring Interface

Keep your Bose® system

You want to replace the radio in your GM vehicle, but you don't want to go through the hassle of replacing your vehicle's Bose® amplifier. PAC's ROEM-GM21A system interface bridges the gap between the Bose® system and your new receiver, allowing you to keep your Bose® system while upgrading your radio. Warranty: 1 year.

Keep your Bose® system

You want to replace the radio in your GM vehicle, but you don't want to go through the hassle of replacing your vehicle's Bose® amplifier. PAC's ROEM-GM21A system interface bridges the gap between the Bose® system and your new receiver, allowing you to keep your Bose® system while upgrading your radio. Warranty: 1 year.

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.

READ LESS

What's in the box:

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

Customer reviews

Loading reviews...

PAC ROEM-GM21A Wiring Interface reviews

Average review:

22 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Very easy install

Crutchfield customer from Teaneck, NJ on 4/21/2019

2000 GMC Jimmy

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

Works well and easy to install

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Factory Bose system upgrade

Crutchfield customer from Grand Ledge, MI on 4/8/2019

2000 GMC Yukon Denali

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

I needed one of these to connect my Bose system to my aftermarket receiver. I wasn't expecting much and wondered if I should get a new amp and speakers. However, I was blown away by the sound from my system after the upgrade. I honestly did not know it could sound this good. I am so very please with this and highly recommend it to anyone considering an upgrade to their factory Bose system. Thank you Crutchfield!!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

PAC ROEM-GM21A Wiring Interface

Crutchfield customer from Angwin, CA on 3/19/2019

2002 Chevrolet Suburban

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

Installation was perfect

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Just works!! but need to read manual about Hi / Low power Amp rating

Crutchfield customer from Woodside, NY on 11/17/2018

2002 Cadillac Escalade

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

It just works!! No hiss, no noise, no thumb, no cracking sound. One confusion thing with wiring was that there were 2 sets of wires for hi and low power speaker connection. I needed to read the manual carefully to understand what "hi" and "low" meant. I checked my stereo spec to match AMP power rating accordingly. I wish there was a flicker switch instead of separate hi/low wires. Just too many wires hanging out from the unit, don't you think? But it performs flawlessly.

Pros: It just works!!

Cons: too many wires...

Crutchfield response on

0 of 0 found this helpful

Confidence

Alan from Saint Cloud, FL on 10/22/2018

2001 Chevrolet Tahoe

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

I love Crutchfield. Not just because they had the equipment I needed, but because they took the time to explain what I needed and how to install. Shopping with Crutchfield gave me confidence in a confusing world.

Pros: Great service, great product.

Cons:

Crutchfield response on

0 of 0 found this helpful

Great

Crutchfield customer from Las Cruces, NM on 8/27/2018

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

The staff are great, the price is awesome,the shipping time was super fast, item is perfect.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Easy Install

Richard J from Sugar Land, TX on 1/2/2018

2002 Chevrolet Tahoe

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

Was easy to install..The problem I have with this unit is that the rear speakers play very low. I have tried tweaking the unit with the adjustment screws and still the sound is really low..Will probably replace this with something else. I do not recommend this unit it personally.

Pros: No problem with the Install

Cons: Sound is really weak on the rear speakers

Crutchfield response on 1/3/2018
Richard, we're sorry you're having issues with your interface. If the problem continues or if you'd like some help, please just reach out to our Tech Support team. They can either help get interface working properly, or possibly return it for an exchange or refund.

0 of 0 found this helpful

PAC ROEM-GM21A Wiring Interface

Bobby from Selma, CA on 11/10/2017

2000 GMC Yukon Denali

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

Awesome product. Easy install. Great results.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

PAC ROEM-GM21A Wiring Interface

Crutchfield customer from Waterford, MI on 8/22/2017

2001 GMC Yukon XL Denali

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

Instructions weren't very clear. Had to improvise. End result - it works.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

PAC ROEM-GM21A Wiring Interface

Guest from Lodi, CA on 8/10/2017

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

it has reduced power to my rear left speaker to where i can hardly hear it

Pros:

Cons:

Crutchfield response on 11/9/2018
One of our Tech Support gurus, Gage, diligently tracked down the problem that some of our customers were having with this PAC adapter. It's made only for specific GM vehicles with the factory Bose audio system, and it will not work with non-Bose systems. There are different grounding systems for these two options. It turns out that in a few cases, the vehicle and factory audio system had been misidentified. Having the right information for your vehicle is crucial in getting the right gear.

0 of 0 found this helpful

Works great

Dj from Helena, Ohio on 7/14/2017

1999 Cadillac Escalade

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

Works great as it should not too difficult to hook up but could be a little easier maybe.

Pros: Does what it's suppose to!

Cons: A few different ways to hook it up depending on your car would be nicer if it was car specific not just car general i.e. Certain manufacturer and years.

Crutchfield response on

1 of 1 found this helpful

Great Price , well worth the money.

Dale from Torrance, CA on 6/28/2017

2001 Chevrolet Tahoe

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

Very cool, retains all of the features that the truck came with . Except the sound is a lot better.

Pros: Retains the Bose and all on stars features.

Cons: A LOT of wires and a little confusing, even with the instructions provided.

Crutchfield response on

0 of 0 found this helpful

Great

Earl from Rochester,ny on 6/18/2017

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

Grea

Pros: Everything fit and works perfectly

Cons: None

Crutchfield response on

0 of 0 found this helpful

PAC ROEM-GM21A Wiring Interface

Kevin from Weatherford, TX on 5/15/2017

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

Did not work right very decreased sound to rear speakers!

Pros:

Cons:

Crutchfield response on 5/17/2017
One of our Tech Support gurus, Gage, diligently tracked down the problem that some of our customers were having with this PAC adapter. It's made only for specific GM vehicles with the factory Bose audio system, and it will not work with non-Bose systems. There are different grounding systems for these two options. It turns out that in a few cases, the vehicle and factory audio system had been misidentified. Having the right information for your vehicle is crucial in getting the right gear.

1 of 1 found this helpful

PAC ROEM-GM21A Wiring Interface

James A from Manassas, VA on 3/2/2017

2001 Chevrolet Suburban

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

Easy to install worked great

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

PAC ROEM-GM21A Wiring Interface

Jason from Olmsted Falls, OH on 3/1/2017

2001 Chevrolet Blazer

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

Best thing for a clean and easy install.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Easy and Simple!

Crutchfield customer from Mount Vernon, IL on 1/12/2017

2002 Cadillac Escalade

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

Really simple, wire colors on it matched my radio and the plug on the other side plugged right onto the factory plug in my 2002 Escalade

Pros: Excellent product all the way around Came with instructions Works great Easy install

Cons: None

Crutchfield response on

1 of 1 found this helpful

PAC ROEM-GM21A Wiring Interface

Jon from Waseca, mn on 11/28/2016

2001 Chevrolet Suburban

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

Made the install very easy.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

As Advertised

larry from Meridian, ID on 9/27/2016

2001 GMC Yukon

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

works as advertised - simple easy to install

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

If you wanna to keep original back sub get this :)

Juan from Quebradillas, PR on 9/4/2016

2002 GMC Yukon

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

If you wanna to keep the original back sub woofer working get this item works with no problem at all

Pros: Easy to install and did keep my Bose sub woofer working amp

Cons: none

Crutchfield response on

1 of 1 found this helpful

Easy to install

Kathryn from Kentucky on 3/31/2016

2000 GMC Jimmy

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

The interface is easy to install one side you use the wiring harness from you vehicle and the other goes from the box to the your stereo. All wires should be used because it comes with high and low.

Pros: Easy to install

Cons: n/a

Crutchfield response on

1 of 1 found this helpful

PAC ROEM-GM21A Wiring Interface

Pete from South Dakota on 11/25/2015

2001 GMC Yukon XL

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

I am thinking this is just what I will need to get my wife's stereo installed in her 01 Yukon

Pros:

Cons:

Crutchfield response on

3 of 6 found this helpful

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

Pros:

Cons:

Crutchfield response

<< >>

More details on the PAC ROEM-GM21A Wiring Interface

Stacey B.

Product Research

Features

Radio Replacement Interface: The PAC ROEM-GM21A 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-GM21A is compatible with the following GM vehicles featuring the factory installed Bose audio system.

Make Model Year
Cadillac Escalade 1999-2002
Chevy Blazer (S-10) 1999-2001
Suburban 1998-2002
Tahoe 1998-2002
GMC
Jimmy 1998-2001
Yukon 1998-2002

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.

Loading accessories...

Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
So that my Bose system and steering wheel control will still work [ GREGORY  Dec 28, 2018 ]
A
Needed it. [ sarah  Jul 17, 2018 ]
A
It was needed. [ Brandon  May 17, 2018 ]
A
want subs in my whip [ Ranger  Feb 23, 2018 ]
A
so i dont mess up the factory amp [ Jonathan  Nov 22, 2016 ]
A
its required for full operational interface to vehicle [ james  Jun 08, 2016 ]
A
Only way to do it [ Devin  May 01, 2016 ]
A
Needed for install [ H  Jan 14, 2016 ]
SHOW MORESHOW LESS

3 questions already asked

Q
Will it still work with a six disc CD player??
[ TeeTee  Jun 16, 2018 ]
2 answers
A
Factory CD changers will not be retained when a new stereo is installed.
[ Ryan  Jun 20, 2018 ]  Staff
A
if you mean the cd that come originally it will bypass the unit cause you are using the aftermarket radio with this adapter
[ Juan  Jun 16, 2018 ]
Q
this for an 02 escalade ext?
[ dan  Mar 19, 2017 ]
1 answer
A
For additional 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 integrate and what you will need for an installation in your vehicle.
[ Kenny  Mar 20, 2017 ]  Staff
Q
Will this item work on a 99 gran prix with Bose system with out onstar?
[ Maurice  Jun 06, 2016 ]
1 answer
A
For additional 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.
[ Kenny  Jun 06, 2016 ]  Staff

Loading articles...

TOP