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Scosche GM21SR

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

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Scosche GM21SR

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

$99.99

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Scosche Audio Store

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

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.
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.
Install a Car Stereo & Bypass the Factory OEM Amplifier
Additional Harness Features
The various features that the wiring harness provides to your car stereo and/or audio system.
Chime Retention
OnStar Retention
Retained Accessory Power (RAP) Retention
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.
Buick
Cadillac
Chevrolet
GMC
HUMMER
Saturn
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 Enclave
Buick Lucerne
Cadillac DTS
Cadillac Escalade
Cadillac SRX
Chevy Avalanche
Chevy Impala
Chevy Monte Carlo
Chevy Silverado
Chevy Suburban
Chevy Tahoe
Chevy Traverse
GMC Acadia
GMC Sierra
GMC Yukon
Hummer H2
Saturn Outlook

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.
Amplified
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.
Standard Bose
On-Star Compatible
This means that the harness is compatible with vehicles that have On-Star built-in.
Yes
CAN-BUS Compatible
CANBUS Ballasts ensure compatibility with ALL vehicle makes and models without the need for additional accessories. In addition, they have built-in Anti-Flickering Capacitors to help prevent lighting issues caused by voltage spikes and drops by stabilizing the power.
No
GM-LAN Compatible
This means that the item is compatible with GM-LAN systems.
Yes
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.
Yes
Chime Retention
This means that the harness is able to retain the vehicles chimes.
Yes

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

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

Average Attribution Rating

Durability
4.0
Value
3.9
Features
4.3
Design
4.2
Usability
4.4
Richard

Humble, TX

Overall
Durability
Value
Features
Design
Usability
It works.

March 8, 2011

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.

19 of 23 found this helpful

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gerone

Gladewater, TX

Overall
Durability
Value
Features
Design
Usability
controls

November 8, 2010

great

18 of 21 found this helpful

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Tyson

Port St Lucie, FL

Overall
Durability
Value
Features
Design
Usability
Great

January 1, 2015

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

17 of 20 found this helpful

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peggy

Chatsworth, CA

Overall
Durability
Value
Features
Design
Usability
Great place to do business

January 23, 2014

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.

19 of 24 found this helpful

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ENOX

Donna, TX

Overall
Durability
Value
Features
Design
Usability
scosche gm21sr

August 17, 2010

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...

18 of 22 found this helpful

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andre

jacksonville, FL

Overall
Durability
Value
Features
Design
Usability
Waste of money

July 2, 2011

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

17 of 21 found this helpful

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Dave

Newburgh, IN

Overall
Durability
Value
Features
Design
Usability
Not worth it

March 4, 2010

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.

18 of 23 found this helpful

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Luke

Carbondale, CO

Overall
Durability
Value
Features
Design
Usability
Not bad

October 29, 2009

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

17 of 21 found this helpful

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jason

Berwick, LA

Overall
Durability
Value
Features
Design
Usability
Does What It's supposed to

December 20, 2012

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.

15 of 19 found this helpful

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Marcus

Covington, GA

Overall
Durability
Value
Features
Design
Usability
Great Buy

July 26, 2012

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

14 of 17 found this helpful

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waynet

socal

Overall
Durability
Value
Features
Design
Usability
If you have an 09 GM - Caution

September 11, 2009

Unit works fine in my 09 Silverado, EXCEPT there apparently is no way to control Onstar volume. According to Scosche, the steering wheel or dimmer procedure to control onstar volume doesn't work in the 09s.

15 of 19 found this helpful

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francisco

Worcester, MA

Overall
Durability
Value
Features
Design
Usability
Paco

December 10, 2013

Tanbien conpre este producto y la berdad que te Elvira muchas Dolores de cabesa y la berdad que que el presio creo que eso fue lo de menos y muy comtento con este producto se Los recomiendo

12 of 14 found this helpful

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Jack

Thayer, MO

Overall
Durability
Value
Features
Design
Usability
good product

November 21, 2011

Essential part of system.

13 of 16 found this helpful

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Alfredo

Monroe, NC

Overall
Durability
Value
Features
Design
Usability
Scosche GM21SR / GM21SRB

September 19, 2011

The product make my radio started humming 2 weeks after it was installed by a professional installer. He warned me not to use this particular one. However I expected him to say that because he was carring a different model. I have to from time to time bang on the dash board to make it stop. I was not to happy about it and If I was to return it now I would have to repay for the programming and install again.

13 of 16 found this helpful

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John

Canada

Overall
Durability
Value
Features
Design
Usability
Great item with clear instructions

March 6, 2013

Great item with clear instructions, hope to use the item again.

12 of 15 found this helpful

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THOMAS

Baton Rouge, LA

Overall
Durability
Value
Features
Design
Usability
Great peace

December 28, 2011

Works well with door chimes and OnStar.

12 of 15 found this helpful

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Cody

Fort Pierce, FL

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Worked great

July 21, 2015

This worked flawlessly with my truck. It's not screaming loud like factory chimes.
Only downside to this is the speaker in this isn't that great of quality so it sounds kinda static when chiming. (though it was a issue but every one I've owned did it). But doesn't really bother me
Second thing about it is the harness wires aren't very long
I was very cramped when installing this but it worked out
Good product for the money

Other then that everything else seems to be flawless

11 of 14 found this helpful

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Jason

Canada

Overall
Durability
Value
Features
Design
Usability
deck turns off

September 7, 2010

I bought this for my 09 sierra, chimes work, saves on star etc, There is a way to turn the volume down for 09s you just gotta keep trying it, i did it. The only problem I've been having is that my deck will randomly turn off because the module cannot keep a 12v. maybe i just got a faulty one, I heard Pac audio is a safer option

11 of 15 found this helpful

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Bryan

Las Vegas, NV

Overall
Durability
Value
Features
Design
Usability
Works great

July 5, 2015

Works good with onstar no problems so far would suggest to anyone with GM Onstar

7 of 10 found this helpful

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Browse 2 questions and 4 answers
Hide answersShow all answers | Sort by
Will this allow steering wheel controls to function as well?
2007 Chevy Suburban W/Bose W/OnStar
Quinton B on Sep 9, 2014
Best Answer: Hello Quinton,

No. You must also pick up the Axxess ASWC-1, Universal Steering Wheel Control Interface. For slightly easier installation, a bit of a price break, consider the PAC RadioPro RP4-GM31 instead; as it has SWC retention with It already.

[Note: If you are purchasing a Headunit WITH the harness, give our Sales Team a call to make the swap/accommodation]
Reply · Report · Customer SStaff on Sep 9, 2014
· Add Answer · I Have This Question Too (0)
I have a 2007 Chevrolet Avalanche with on-star, non-bose. I purchased this headunt and wanted to know if the Scosche GM21SR was compatible with maintaining my chimes and on-star functionality? I attempted to call customer support but could not get through.
Jacoby P on Nov 21, 2016
Scosche GM21SR
Scosche GM21SR
Pioneer AVH-X2800BS
Pioneer AVH-X2800BS
Best Answer: Yes, it is compatible. However, we suggest going with the Metra equivalent, the Axxess GMOS-LAN-01, because it is readily available (not special order).

http://www.sonicelectronix.com/item_12910_Axxess-GMOS-LAN-01.html
Reply · Report · Rick MStaff on Nov 21, 2016
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

GM21SR

UPC

033991016231

Weight

0.75lbs

Internal SKU

gm21sr

Internal Product ID

9414

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: Scosche GM21SR