Axxess GMOS-04 (gmos04) OnStar Interface for Amplified GM Systems
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Axxess GMOS-04

OnStar Interface for Amplified GM Systems

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List price $179.95

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$86.99

with warranty

+ FREE Shipping in US 48

Order within 69 hrs 18 mins to ship 8/26

Arrives by Thursday, Aug. 29 to zip 23465

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Product Features:

  • Interface designed to allow for the replacement of the OEM Radio with an aftermarket unit in amplified GM Vehicles, Premium Amplified or Bose audio systems
  • Retains full functionality of the OnStar system with adjustable volume output
  • Retains safety and warning chimes with adjustable level output
  • Retains the Retained Accessory Power (RAP) convenience features
  • Required outputs for the installation of a navigation radio
  • USB updatable with Axxess USB-CAB
  • Navigation outputs now included
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Compatibility List:

  • Buick:
    • 2005 - 2009 Allure
    • 2004 - 2005 Century
    • 2005 - 2009 LaCrosse
    • 2004 - 2007 Rainer
    • 2004 - 2004 Regal
    • 2002 - 2007 Rendevous
    • 2005 - 2008 Terraza
  • Cadillac:
    • 2003 - 2006 Escalade
    • 2003 - 2006 Escalade EXT
  • Chevrolet:
    • 2003 - 2006 Avalanche
    • 2001 - 2005 Cavalier
    • 2004 - 2009 Colorado
    • 2003 - 2007 Express
    • 2000 - 2005 Impala
    • 2001 - 2005 Malibu (2004-2005 Classic ONLY)
    • 2000 - 2005 Monte Carlo
    • 2003 - 2006 Silverado (all models)
    • 2007 - 2007 Silverado Classic
    • 2003 - 2006 SSR
    • 2003 - 2006 Suburban
    • 2003 - 2006 Tahoe
    • 2002 - 2009 Trailblazer
    • 2005 - 2008 Uplander
    • 2000 - 2005 Venture
  • GMC:
    • 2004 - 2010 Canyon
    • 2002 - 2009 Envoy
    • 2003 - 2007 Savana
    • 2003 - 2007 Sierra (Classic)
    • 2003 - 2006 Yukon/XL/Denali
  • Hummer:
    • 2003 - 2007 H2
    • 2006 - 2009 H3
  • Isuzu:
    • 2003 - 2008 Ascender
    • 2007 - 2008 I290
    • 2006 - 2006 I280
    • 2007 - 2008 I370
    • 2006 - 2006 I350
  • Oldsmobile:
    • 2001 - 2004 Alero
    • 2002 - 2004 Bravada
    • 2002 - 2002 Intrigue
    • 2000 - 2004 Silhouette
  • Pontiac:
    • 2001 - 2005 Aztec
    • 2001 - 2005 Grand AM
    • 2004 - 2008 Grand Prix
    • 2000 - 2005 Montana
    • 2000 - 2005 Sunfire
  • SAAB:
    • 2005 - 2009 9-7x
  • Saturn:
    • 2005 - 2007

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.
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
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
Chevrolet
Oldsmobile
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 Allure
Buick Century
Buick Lacrosse
Buick Rainier
Buick Rendezvous
Buick Terraza
Chevy Avalanche
Chevy Cavalier
Chevy Corvette
Chevy Express Van
Chevy Impala
Chevy Malibu
Chevy Monte Carlo
Chevy Silverado
Chevy SSR
Chevy Tahoe
Chevy Trailblazer
Chevy Uplander
Oldsmobile Alero
Oldsmobile Bravada
Oldsmobile Intrigue
Oldsmobile Silhouette

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.
Premium Bose
Standard Bose
On-Star Compatible
This means that the harness is compatible with vehicles that have On-Star built-in.
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
76%
4 Star
14%
3 Star
0%
2 Star
0%
1 Star
10%

Average Attribution Rating

Durability
4.3
Value
4.2
Features
4.3
Design
4.2
Usability
4.3

Gray, TN

Overall
Durability
Value
Features
Design
Usability
It works

September 26, 2009

It works. Every once in a while there is a glitch, but if I turn off the car and turn it back on, everything works OK.

You need room for the box nearby the radio. Its not the easiest setup in the world. I had to add some RCA connectors to make it work for my setup. I also had to run a separate dimmer light for my radio (the harness from my car didn't have a dimmer wire).

Here is my setup:
2001 Impala
Metra GMOS-04 - converter necessary for GM Car
PAC SWI-PSv1 - Steering wheel controls
iPod Classic
XM SkiFi3 radio used through Aux port
Alpine MRP-F300 amp
Kenwood KFC-X1710 front speakers
Kenwood KFC-X692 rear speakers
Bluetooth with Sprint Mogul phone & Motorolla RAZR phone

42 of 48 found this helpful

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lawton, OK

Overall
Durability
Value
Features
Design
Usability
great product

November 14, 2009

intalled in my 05 gmc sierra...works great without issues so far. installation was easy as it came with a simple installation guide

41 of 47 found this helpful

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Fayetteville, GA

Overall
Durability
Value
Features
Design
Usability
Great interface

January 23, 2015

Took a minute to figure out but works as advertised

38 of 43 found this helpful

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Wichita ks

Overall
Durability
Value
Features
Design
Usability
Great value

October 21, 2013

I purchased the GMOS-04 for my 05 burban & the install was so easy , I would definitely recommend this product to anyone , for the price u just can't beat it , also if u install yourself u save about 400.00

37 of 43 found this helpful

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Huntsville, TX

Overall
Durability
Value
Features
Design
Usability
Axxess GMOS-04 makes it easy.

December 22, 2010

It was actually harder to find the right adapter from the dealer here in town than it was to hook this one up. It went together very easily and quickly and works flawlessly. I am quite pleased.

35 of 41 found this helpful

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franklin, NE

Overall
Durability
Value
Features
Design
Usability
Doesn't work properly

March 23, 2015

Order the product for my 2006 gmc can't get it to work sounds like it's muted or shorted out inside followed instruction check all connections still can't get proper sound not pleased at all

31 of 35 found this helpful

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hemlock, MI

Overall
Durability
Value
Features
Design
Usability
almost flawless

December 10, 2009

piece of cake... works great with my Bose system... only gripe would be level matching being separate for left and right channel.. some would call it a bonus. i would call it a pain... this is why stereo manufacturers include a balance feature in the head unit

33 of 40 found this helpful

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MD

Overall
Durability
Value
Features
Design
Usability
GMOS-04

December 2, 2009

It is very easy to install. If you have an internally amplified sound system you do hear some interference. Overall the product is not bad, but it would be nice if it did not make so much noise past a certain volume level.

32 of 38 found this helpful

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Durand, WI

Overall
Durability
Value
Features
Design
Usability
Great product

September 29, 2013

This product was easy to install and worked perfectly, THANKS Sonic for all your help.

31 of 37 found this helpful

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lafayette la

Overall
Durability
Value
Features
Design
Usability
good product

September 5, 2013

This product I purchased works very good the price was very reasonable and works real good for my onstar in my Buick lacrosse.

31 of 37 found this helpful

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Las Cruces , NM

Overall
Durability
Value
Features
Design
Usability
I approve

May 12, 2013

The instructions on this harness could of used a little more detail but one quick call to axxess customer service and all my questions had answers. Just make sure you install on a week day during business hours.

30 of 36 found this helpful

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jesup, IA

Overall
Durability
Value
Features
Design
Usability
Easy to install

September 25, 2014

Very easy to install compared to other editions of this kit made by cheaper manufactures. Highly recommend.

30 of 37 found this helpful

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yuma, AZ

Overall
Durability
Value
Features
Design
Usability
great product

February 23, 2013

i used this to install my pioneer and keep all the function and wiring in my truck stock with out doing a hack job and ruining my trucks harness i had no issues and it did what it says it does with easy install.

29 of 35 found this helpful

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marmaduke ar

Overall
Durability
Value
Features
Design
Usability
great

March 21, 2014

I recommend this product for anybody that has OnStar an automatic dinner on the was simple and easy to hook upI own this product and it works great

30 of 38 found this helpful

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Canada

Overall
Durability
Value
Features
Design
Usability
A very good buy

December 24, 2011

The unit was seal shipped right away, easy to install and works great. I'm happy with my product.

25 of 30 found this helpful

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Watertown, SD

Overall
Durability
Value
Features
Design
Usability
not pleased

March 31, 2015

Installed according to the vague instructions, from the get-go, the volume was low, turned the gain knob all the way up, volume still low. Figured I will deal with volume at a later date. The major complaint I have is this harness killed my battery, 3 times. I did some research on the internet and found that this is a major complaint along with the low volume. It surprises me that all the reviews on this site are positive.I went to another popular online electronics retailer and read the reviews on their site, mostly negative. I returned my harness and am trying to find another brand. not happy.

23 of 27 found this helpful

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los osos, ca

Overall
Durability
Value
Features
Design
Usability
axxess gmos-04. 2005 gmc sierra with bose

June 10, 2011

2005 gmc sierra with stock nose system, upgraded to Kenwood dnx9140. System works perfectly with steering wheel controls. Ordering was quick and easy. Fast cheap shipping. Highly recommend.

26 of 33 found this helpful

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Grandville, MI

Overall
Durability
Value
Features
Design
Usability
axxess gmo-04

December 4, 2014

this item works like it is advertised. easy to install

25 of 32 found this helpful

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lafayette la

Overall
Durability
Value
Features
Design
Usability
good product

September 5, 2013

This product I purchased works very good the price was very reasonable and works real good for my onstar in my Buick lacrosse.

27 of 36 found this helpful

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concord, NC

Overall
Durability
Value
Features
Design
Usability
does as says

October 13, 2011

I hate on-star but I do use this.

27 of 36 found this helpful

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Canada

Overall
Durability
Value
Features
Design
Usability
Lots of work to install but worth it

November 26, 2013

The product works as advertised and makes it a lot easier to just plug and play a new stereo into a GM vehicle.

Lots of crimping or soldering for install though (to be expected by pretty much anything of this nature).

23 of 32 found this helpful

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Russian Federation

Overall
Durability
Value
Features
Design
Usability
I recommend this product !

December 8, 2015

This gadget allows you to connect Radio 2 DIN without using force .

1 of 1 found this helpful

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kentucky

Overall
Durability
Value
Features
Design
Usability
Axxess Gmos-04

October 25, 2015

Everything I have bought from you guys lived up to the description of the product.

2 of 3 found this helpful

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Louisville Kentucky

Overall
Durability
Value
Features
Design
Usability
Good product

October 5, 2015

Is fast shipping if anyone need something I recommend you

3 of 5 found this helpful

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Morgantown, IN

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Much needed product.

April 3, 2018

The product was easy to install to aftermarket radio. Color-coded wires were a match to the factory wiring harness.

0 of 0 found this helpful

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$city, $state

Overall
Durability
Value
Features
Design
Usability
Truth in advertising

November 9, 2017

Worked as advertised. Bought for 05 Tahoe with Bose system. Works in conjunction with steering wheel control adapter to retain all functions.

0 of 0 found this helpful

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Indiana

Overall
Durability
Value
Features
Design
Usability
Never fixed my installation issue

June 8, 2017

They could not resolve my installation issue for my 2004 H2 Hummer. Bought whole new radio bundle from them for it per there web site. Radio still not installed. Now have to go to car stereo store to b pay and have them fix it.

0 of 0 found this helpful

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Arlington Heights, IL,

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Works as advertised!

February 22, 2017

I asked for a harness that would make aftermarket radio install a snap, and was referred to this product. Worked great. I wish the instructions were a little more detailed for a novice installer. There were some modules (that I ended up not using) that I had no idea what they were for. Would have been nice if these were spelled out clearer- but I figured it out.

0 of 0 found this helpful

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Cleveland, Ohio

Overall
Durability
Value
Features
Design
Usability
GMOS -04

January 4, 2016

The hook up process was a little frustrating but the overall function of this product has been good. I am pleased with my purchase

0 of 0 found this helpful

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Product Summary

Manufacturer

Model Number

GMOS-04

Weight

0.51lbs

Internal SKU

gmos04

Internal Product ID

12901

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: Axxess GMOS-04

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Axxess GMOS-04

OnStar Interface for Amplified GM Systems

$86.99

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