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Radio Replacement Interface for Select 2006-2008 GM Vehicles

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List price $119.95

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Radio Replacement Interface for Select 2006-2008 GM Vehicles


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PAC Store

The C2R-GM29 allows aftermarket radio installation without retention of the factory radio. The interface replicates all factory warning chimes, audible turn signal indicators and provides a data bus generated 12 volt accessory output that acts just as GM’s R.A.P. (Retained Accessory Power) system did prior to radio removal. R.A.P. keeps the radio powered after the key is off, until the driver door is opened or a 10 minute timer ends, whichever comes first. The C2R-GM29 also provides a SWC (Steering Wheel Control) output wire at the interface. By using this interface, the Parking Assist System will receive a “healthy” system status and the Rear Seat Audio controls will also be available for use (if equipped).

General Features:

  • Retains the vehicles accessory power (R.A.P.) as well as the 12V output
  • Keeps the vehicles door chimes and audible turn signal indication
  • Digital amplifier turn-on
  • Steering wheel control output
  • Allows for the use of rear seat controls
  • Factory Rear Seat Entertainment LCD/IR turn on
  • 1-year warranty

Compatibility List:

  • Chevrolet:
    • 2007-2013 Avalanche
    • 2007-2008 Equinox
    • 2008-2013 Express
    • 2007-2012 Impala
    • 2006-2007 Monte Carlo
    • 2007-2013 Silverado (Non Classic)
    • 2007-2013 Suburban
    • 2007-2013 Tahoe
    • 2009-2014 Traverse
  • GMC:
    • 2007-2014 Acadia
    • 2008-2014 Savana
    • 2007-2013 Sierra (Non Classic)
    • 2007-2013 Yukon (Denali)
  • Cadillac:
    • 2006-2011 DTS
    • 2007-2013 Escalade
    • 2007-2009 SRX
  • Buick:
    • 2008-2014 Enclave
    • 2006-2011 Lucerne
  • Hummer:
    • 2008-2009 H2
  • Pontiac:
    • 2007-2009 Torrent
  • Saturn:
    • 2007-2009 Outlook
    • 2008-2009 Vue


  • Yellow - 12V Constant
  • Red - 12V Accessory
  • Black - Ground
  • Orange - Dash Light Dimmer/Illumination
  • Green - Left Rear Speaker (+)
  • Green with Black Stripe - Left Rear Speaker (-)
  • White - Left Front Speaker (+)
  • White with Black Stripe - Left Front Speaker (-)
  • Purple - Right Rear Speaker (+)
  • Purple with Black Stripe - Right Rear Speaker (-)
  • Gray - Right Front Speaker (+)
  • Gray with Black Stripe - Right Front Speaker (-)

Harness Features

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.
Connect/Install an 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.
Buick Lucerne
Cadillac DTS
Cadillac Escalade
Cadillac SRX
Chevy Avalanche
Chevy Equinox
Chevy Impala
Chevy Monte Carlo
Chevy Silverado
Chevy Suburban
Chevy Tahoe
GMC Acadia
GMC Sierra
GMC Yukon
Pontiac Torrent
Saturn Outlook

Premium Harness Features

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



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December 1, 2010

This product works great and retains all of my factory warnings!! Sonic Electronix had it to me fast too.

16 of 20 found this helpful

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Browse 1 question and 1 answer
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Will this work on my 06 Cadillac DTS?
Larry J on Nov 23, 2015
Reply · Report · Rick MStaff on Nov 23, 2015
· Add Answer · I Have This Question Too (0)

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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: PAC C2R-GM29