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Axxess GMOS-04

OnStar Interface for Amplified GM Systems

In Stock
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List price $179.95

$98.99

with warranty

You Save: $80.96 (44.99%)

Order within 7 hrs 22 mins to ship today

Arrives by Friday, Oct. 31 to zip 07095

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Arrives by Fri, Oct. 31

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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 with Premium 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 - 2007 Allure
    • 2004 - 2005 Century
    • 2005 - 2007 LaCrosse
    • 2004 - 2007 Rainer
    • 2002 - 2007 Rendezvous
    • 2005 - 2007 Terraza
  • Chevrolet:
    • 2003 - 2006 Avalanche
    • 2000 - 2005 Cavalier
    • 2005 - 2007 Corvette
    • 2003 - 2007 Express
    • 2000 - 2005 Impala
    • 2002 - 2003 Malibu
    • 2000 - 2005 Monte Carlo
    • 2003 - 2006 Silverado
    • 2003 - 2006 SSR
    • 2003 - 2006 Tahoe
    • 2002 - 2007 Trailblazer
    • 2005 - 2007 Uplander
  • Oldsmobile:
    • 2001 - 2004 Alero
    • 2002 - 2005 Bravada
    • 2000 - 2004 Silhouette
    • 2002 Intrigue

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
24%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.5
Value
4.5
Features
4.4
Design
4.2
Usability
4.5
josh

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.

0 of 0 found this helpful

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marmaduke

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

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Joe

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).

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cheetah

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

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Terry

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.

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big cuz

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.

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big cuz

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.

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D

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.

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rick

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.

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mr.blakz

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.

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jonathan

concord, NC

Overall
Durability
Value
Features
Design
Usability
does as says

October 13, 2011

I hate on-star but I do use this.

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matty

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.

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Donald

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.

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jeffrey

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

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Jeff

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.

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louis

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

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A Guy

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

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Browse 3 questions and 3 answers
Hide answersShow all answers | Sort by
Does this adapt steering controls too, or another adapter is needed?
A shopper on Oct 12, 2014
Best Answer: Hello,

You will also require the use of the Axxess ASWC-1 to retain Steering Wheel Control functions.

Axxess ASWC-1
http://www.sonicelectronix.com/item_68038_Axxess-ASWC-1.html
Reply · Report · Customer SStaff on Oct 12, 2014
· Add Answer · I Have This Question Too (0)
will this unit allow me to use the factory tape deck w/ an afterrmarket cd player?
A shopper on Sep 10, 2014
Best Answer: EASY TO INSTALL WITH THIS UNIT,NO HEADACHE..!
Reply · Report · francisco l on Sep 18, 2014
· Add Answer · I Have This Question Too (0)
Hi will this work for a 2009 montana sv6 with onstar ?
Joel D on Aug 29, 2014
Best Answer: Hello Joel,

Unfortunately the U.S. Spec Montana cease to be offered in '06, so we cannot guarantee compatibility. Please contact Metra's tech support; http://www.metraonline.com/contact-us .
Reply · Report · Customer SStaff on Aug 30, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

GMOS-04

UPC

086429115716

Weight

0.50lbs

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