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Scosche GM21SR

GM/LAN Amplified/Non-Amplified OnStar Integrated Harness for 2006-Up Select GM Vehicles

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• Radio Replacement Interface
• Designed For 2007-Up GM Vehicles With OnStar, RAP & Factory Amplifiers
• Retains OnStar Functionality, Warning Chimes, and Parking Assist Chimes

See compatible vehicles Learn more about the gm21sr

We apologize

This item has been discontinued

Description


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Authorized dealer

Radio Replacement Interface for select GM / Chevrolet vehicles 2006-up. This Harness will allow you to retain Onstar, RAP & FACTORY AMPLIFIERS (Bose, Monsoon etc.). It is not included in our standard free harness offer when a head unit is purchased.

General Features:

  • Radio replacement interface
  • Designed for 2007-up GM vehicles with OnStar, RAP and Factory Amplifiers
  • This Product Retains the Following Factory Equipped Features:
    • Compatible with both non-Bose and Standard Bose
    • OnStar
    • Warning Chimes
    • Folding Mirrors (Including Reverse)
    • Park Assist (Front/Rear)
    • Heated Seats
    • AC Fan Speed
    • Turn Signal
  • Compatible with RAP systems (Retained Accessory Power)
  • 1-year Manufacturer's Warranty

Compatible Vehicles

  • Buick
    • 2008 - 2012 Enclave w/ Onstar
    • 2006 - 2011 Lucerne w/ Onstar
  • Cadillac
    • 2006 - 2010 DTS w/ Onstar
    • 2007 - 2014 Escalade w/ Onstar
    • 2007 - 2013 Escalade ESV w/ Onstar
    • 2007 - 2013 Escalade EXT w/ Onstar
    • 2007 - 2009 SRX
  • Chevrolet
    • 2007 - 2013 Avalanche w/ Onstar
    • 2006 - 2013 Impala w/ Onstar
    • 2006 - 2007 Monte Carlo w/ Onstar
    • 2007 - 2013 Silverado 1500-3500 w/ Onstar
    • 2007 - 2014 Suburban w/ Onstar
    • 2007 - 2014 Tahoe w/ Onstar
    • 2009 - 2012 Traverse w/ Onstar
  • GMC
    • 2007 - 2012 Acadia w/ Onstar
    • 2007 - 2013 Sierra 1500-3500 w/ Onstar
    • 2007 - 2013 Yukon w/ Onstar
    • 2007 - 2014 Yukon w/ Onstar
  • Hummer
    • 2008 - 2009 H2/H2 Sut w/ Onstar
  • Saturn
    • 2007 - 2009 Outlook w/ Onstar

Compatible Vehicles


Please use our Fitment Guide to determine specific compatibility for the submodel and audio features

  • 2006 Cadillac DTS
  • 2007 Cadillac DTS
  • 2007 GMC Sierra 1500
  • 2007 GMC Sierra 1500 HD
  • 2007 GMC Sierra 2500 HD
  • 2007 GMC Sierra 3500
  • 2007 GMC Yukon XL 1500
  • 2008 Cadillac DTS
  • 2008 GMC Sierra 1500
  • 2008 GMC Sierra 2500 HD
  • 2008 GMC Sierra 3500 HD
  • 2009 Cadillac DTS
  • 2009 GMC Sierra 1500
  • 2009 GMC Sierra 2500 HD
  • 2009 GMC Sierra 3500 HD
  • 2010 GMC Sierra 1500
  • 2010 GMC Sierra 2500 HD
  • 2010 GMC Sierra 3500 HD
  • 2011 GMC Sierra 1500
  • 2011 GMC Sierra 2500 HD
  • 2011 GMC Sierra 3500 HD
  • 2012 GMC Sierra 1500
  • 2012 GMC Sierra 2500 HD
  • 2012 GMC Sierra 3500 HD
  • 2013 GMC Sierra 1500
  • 2013 GMC Sierra 2500 HD
  • 2013 GMC Sierra 3500 HD
  • 2013 GMC Yukon XL 1500

Specifications & Details


Harness Features
Vehicle Sound System
Premium Sound
Main Harness Function
Install a Car Stereo & Bypass the Factory OEM Amplifier
Additional Harness Features
Chime Retention
OnStar Retention
Retained Accessory Power (RAP) Retention
Premium Harness Features
Factory System Amplification
Amplified
Compatible Premium Audio Systems
Standard Bose
On-Star Compatible
Yes
CAN-BUS Compatible
No
GM-LAN Compatible
Yes
Compatible with Aftermarket Navigation Systems
Yes
Chime Retention
Yes
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

GM21SR

Weight:

0.75lbs

Internal SKU:

gm21sr

Internal Product ID:

9414

Customer Ratings & Reviews



5 star
47%
4 star
37%
3 star
0%
2 star
11%
1 star
5%



Durability
4
Value
3.9
Features
4.3
Design
4.2
Usability
4.4

Customer Reviews

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It works.

I have a 2007 New body Silverado with Bose and On-Star. There are 4 connectors that plug into this box that are not very secure at all, but I ran tie-wraps around them to make a tight connection. Once everything was put in, I was able to retain the factory amplifier, door chimes, blinkers, OnStar and everything else. Also, my factory Bose speakers sounded 1000 times better.
Beware, the actual box is pretty big, and there are alot of wires coming to/from it, so it makes it a pain to stuff it all in your dash, especially with iPod controllers, amplifier RCA cables and etc. I had to cut a piece of plastic from the dash with a sawzall to make it all fit.

By Richard on March 8, 2011

20

found this helpful.

controls

great

By gerone on November 8, 2010

18

found this helpful.

scosche gm21sr

This unit works well with a 06 impala SS. Very easy to install and it kept all the chimes working flawlessly. The impala has a bose audio system, just the regular one, not the "premium" which is NOT compatible with this unit, hope this helps...

By ENOX on August 17, 2010

18

found this helpful.

Great

Matched perfect! Everything accounted for. Reasonable price! Best deal I found!

By Tyson on January 1, 2015

17

found this helpful.

Great place to do business

We have bought two Sirius radio and camera etc for each of our cars, and we love them. The people here are terrific to do business with. They do terrific work and have best products.

By peggy on January 23, 2014

19

found this helpful.

Waste of money

The main problem I have is that the adapter does not have solid connections. Everytime I hit a bump a buzzing sound could be heard in the speakers. Packing insulation foam around the connects worked for a little while. I got fed up and bought the PAC-4 which is more expensive but a far superior adapter

By andre on July 2, 2011

17

found this helpful.

Not worth it

I've had this thing for 6 months now...

Got this for a 09 Silverado 2500HD. The chimes do work OK such as low fuel, light left on ect.... However the turn single is the most annoying sound I have ever heard. Although you can turn down the sound of most ALL other warring chimes, BUT NOT THE TURN SIGNAL????

The door lock chime hardly ever works the way it should.

Way over priced... If I was you I'd look for something better, or do with out.

By Dave on March 4, 2010

18

found this helpful.

Not bad

This product works well, i had trouble at first with the wire connections coming loose inside the dash but I electrical taped them in tight to make connection and it works fine now. only other complaint is stuffing it in behind a dvd player what a pain! Other than that it does what its supposed to and im happy

By Luke on October 29, 2009

17

found this helpful.

Does What It's supposed to

This module work as described. This is the first one I tried and it worked fine, not too big was able to fit it behind the radio in the dash. As far as the plugs fitting loose mine seemed to snap in pretty tight , but i still put zip ties around them just in case.

By jason on December 20, 2012

15

found this helpful.

Great Buy

this item worked great for me i dont know what these other idoits did to it but it work good for me

By Marcus on July 26, 2012

14

found this helpful.

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