Crux General Motors Radio Replacement Module (SWRGM-48)

Install an Aftermarket Radio in select General Motors Class II Vehicles and Retain Steering Wheel Controls

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The CRUX SWRGM-48 is a premium interface for select General Motors Class II Vehicles. It facilitates the integration of an after-market radio to fully retain factory features in GM Class II Data bus vehicles for Bose Amplified and Non-Amplified Systems. This enhanced interface is also pre-programmed for retention of steering wheel controls.

General Features:

  • Aftermarket Car Stereo Installation Interface
  • For select General Motors Class II Vehicles
  • Plug and Play Installation
  • Retains Steering Wheel Controls via built in pre-programmed interface
  • Retains Factory Warning Chimes
  • Works with Bose Amplified, Premium Bose Y91 Amplified and Non-Amplified Systems
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Compatible Vehicles:

  • Cadillac
    • 2003 - 2006 Escalade
    • 2003 - 2006 Escalade ESV
    • 2003 - 2006 Escalade EXT
  • Chevrolet
    • 2003 - 2006 Avalanche
    • 2003 - 2005 Blazer S-10
    • 2000 - 2005 Cavalier
    • 2004 - 2012 Colorado
    • 2005 - 2007 Corvette
    • 2004 - 2004 Malibu (Classic)
    • 2004 - 2004 Pickup S-10
    • 2003 - 2006 Silverado 1500-3500
    • 2007 - 2007 Silverado 1500-3500 (Classic)
    • 2004 - 2006 SSR
    • 2003 - 2006 Suburban
    • 2003 - 2006 Tahoe
    • 2002 - 2009 Trailblazer
    • 2005 - 2008 Uplander
  • GMC
    • 2004 - 2012 Canyon
    • 2004 - 2009 Envoy
    • 2004 - 2007 Envoy XUV
    • 2003 - 2007 Savana
    • 2003 - 2006 Sierra 1500-3500
    • 2007 - 2007 Sierra 1500-3500 (Classic)
    • 2002 - 2004 Sonoma
    • 2003 - 2006 Yukon/ XL
  • Hummer
    • 2003 - 2007 H2
    • 2006 - 2007 H3/H3T
  • Isuzu
    • 2004 - 2008 Ascender
    • 2006 - 2008 i280/i290/i350
  • Saturn
    • 2005 - 2007 Relay

Check out the SWRGM-48 User Manual

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Standard and Premium Sound
Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Replacement Harness for Aftermarket Car Stereo
Additional Harness Features
The various features that the wiring harness provides to your car stereo and/or audio system.
Chime Retention
Retains Steering Wheel Controls
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Cadillac Escalade
Chevy Avalanche
Chevy Blazer
Chevy Cavalier
Chevy Colorado
Chevy Corvette
Chevy Malibu
Chevy Silverado
Chevy SSR
Chevy Suburban
Chevy Tahoe
Chevy Trailblazer
Chevy Uplander
GMC Canyon
GMC Envoy
GMC Savana
GMC Sierra
GMC Sonoma
GMC Yukon
Hummer H2
Hummer H3
Isuzu Ascender
Isuzu I Series
Saturn Relay

Premium Harness Features

Factory System Amplification
This refers to the factory sound system and whether the item is compatible with amplified or non-amplified systems.
Compatible Premium Audio Systems
Some vehicles have higher end audio systems installed in them by the manufacturer. This specifies which premium audio systems this item is compatible with.
Premium Bose
Standard Bose
GM-LAN Compatible
This means that the item is compatible with GM-LAN systems.
Compatible with Aftermarket Navigation Systems
This means that the item is made to work with aftermarket systems with navigation. Typically, this means that the harness has wires that are used with GPS navigation systems, such as VSS wires and others. Please read the product description for full details of this feature.
Chime Retention
This means that the harness is able to retain the vehicles chimes.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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Average Attribution Rating

Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
tried wiring without this and it was a mess, most Suburbans have an amp installed behind the glove box for the woofer in the rear cargo area, if you want sound to come out back there you have to have one of these! Otherwise you will be disconnecting the amp and making your own wire harness from the amp to your sterio connector. YOU DON'T WANT TO DO THAT!!! It's a mess. Make your life easier and spring for this connector.
Tim M on Sep 20, 2016
easy hook up....I hope
Robert A on Sep 8, 2016

Product Summary


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Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Crux General Motors Radio Replacement Module (SWRGM-48)

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Crux General Motors Radio Replacement Module (SWRGM-48)

Install an Aftermarket Radio in select General Motors Class II Vehicles and Retain Steering Wheel Controls


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