Axxess GMOS-13

OnStar Interface for Select 2006-2009 GM Cadillac STS with Factory Amplified Sytem

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List price $149.99

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Product Features:

  • Interface designed to allow the replacement of the OEM Radio with an aftermarket receiver in 2006-2009 Cadillac STS
  • Retains functionality of both the OnStar equipped system and Amplified system
  • Will retain warning chimes even after removal of factory installed radio
  • Provides a 12V switched accessory output
  • Equipped with mute, parking brake, speed sense, and reverse output for aftermarket Navigation Radio installation
  • 14 pin harness
  • 16 pin harness to Cadillac harness
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

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.
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.
Cadillac STS

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.
On-Star Compatible
This means that the harness is compatible with vehicles that have On-Star built-in.
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.
GM-LAN Compatible
This means that the item is compatible with GM-LAN systems.
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.
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

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Sewell, NJ

Great product

December 11, 2012

Although it says 2006-2009 It still works for the 2005 also which I have. Allowed me to install a aftermarket nav with retaining onstar and all chimes etc perfectly. Not many products out there for the Sts and this one came in handy. No complaints except for the size its hard to find room behind the STS dash to fit it.

8 of 10 found this helpful

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Little Rock, AR

no complaints

February 16, 2015

Product was cheaper at sonic electronics than anywhere else I looked

6 of 8 found this helpful

Was this review helpful to you?

Browse 1 question and 1 answer
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I have a 2006 Cadillac sts and i need a wiring harness for it, I dont care about losing the onstar option I dont use it anyway please any suggestions on which to to order... i dont think I need the 84.99 one but i want to make sure?
lando on Feb 10, 2015
Best Answer: Hello Lando,

We researched for vehicle for an alternate option but have concluded that the Axxess GMOS-13 is your best/only option.
Reply · Report · Customer SStaff on Feb 10, 2015
· Add Answer · I Have This Question Too (0)

Product Summary


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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: Axxess GMOS-13

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Axxess GMOS-13

OnStar Interface for Select 2006-2009 GM Cadillac STS with Factory Amplified Sytem


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