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Axxess GMOS-13 Wiring Interface

Connect a new car stereo and retain audible warning chimes, Bluetooth®, factory amp, and OnStar® in 2005-09 Cadillac STS models

4 Reviews | 1 question - 1 answer

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Item # 120GMOS13

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Overview

Our take on the Axxess GMOS-13 Wiring Interface

Your Cadillac is a comfortable, powerful vehicle, but the factory stereo leaves something to be desired. The Axxess GMOS-13 wiring interface allows you to integrate an aftermarket stereo with the amplified sound system in your 2005-2009 Cadillac STS.

Your Cadillac is a comfortable, powerful vehicle, but the factory stereo leaves something to be desired. The Axxess GMOS-13 wiring interface allows you to integrate an aftermarket stereo with the amplified sound system in your 2005-2009 Cadillac STS.

With this interface, you'll be able to enjoy great sound from your new receiver without losing the car's OnStar and Bluetooth functionality. You'll also retain the factory warning chimes and turn signal indicators that are lost when the factory radio is removed. Even if you don't subscribe to OnStar, you'll still need this interface to connect an aftermarket stereo.

The GMOS-13 interface also provides a 12-volt switched accessory output, along with the Mute, Parking Brake, Speed Sense (VSS) and Reverse outputs you'll need if you're installing an in-dash navigation receiver. Warranty: 1 year.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Installed easy and directions were easy to follow as well.

Jonathon, Brighton, TN

What's in the Box:

  • GMOS-13 Cadillac STS amplified OnStar interface module
  • 11" Wiring harness (with a 16-pin connector on one end and bare wires on other end)
  • 18-pin to 16-pin GM harness
  • 16-Pin harness with one stripped lead
  • Installation Instructions
Reviews

Axxess GMOS-13 Wiring Interface Reviews

Average Customer Review(s):

(4 Reviews)

Easy to install

Jonathon from Brighton, TN on 8/2/2017

2005 Cadillac STS
Crutchfield Customer Review (What's this?)

Installed easy and directions were easy to follow as well.

Pros:

Cons:

Great

Mike from York, pa on 3/22/2016

2005 Cadillac STS
Crutchfield Customer Review (What's this?)

Works great very happy I purchased this item

Pros:

Cons:

Kenwood for My Cadillac

Anonymous from Waldorf Md on 9/29/2013

Crutchfield Customer Review (What's this?)

Works just fine. Met my expectations

Pros:

Cons:

Works well

Anonymous from Cypress, TX on 6/24/2013

Crutchfield Customer Review (What's this?)

Straight forward installation. No splicing wires in the car. Instructions could be clearer about the volume adjustment. This adjustment impacts the sound quality.

Pros: works well

Cons: instructions could use improving

Details

Hands-on research

Product Research

Features

Overview: The GMOS-13 interface is designed to let you replace the OEM radio in a 2006-2009 Cadillac STS with an aftermarket unit and still retain full functionality of the factory amplifier and OnStar system, as well as all safety and warning chimes. The GMOS-13 will also retain the retained accessory power convenience features. This interface has the capability of adjusting chime and OnStar volumes as well. In addition to these features, the GMOS-13 has the required outputs for the installation of a navigation radio (including VSS, parking brake, and reverse outputs).

GM Vehicle Compatibility: The GMOS-13 is compatible with the following GM Cadillac vehicles.

MakeModelYear
Cadillac
STS2006-2009

Note: Please consult Crutchfield's Outfit My Car to see if your vehicle is compatible and what additional accessories will be needed.

OEM Steering Wheel Control Compatible (optional): The GMOS-13 features a right-angle 3.5mm connector that lets you keep your GM vehicle's OEM steering wheel controls via the optional Axxess Steering Wheel Control Interface (120ASWC1, sold separately).

OnStar & Chime Volume Adjustment: The volume is adjustable for both the OnStar output & the warning chime.

Wire Code Chart:

Wire ColorFunction
Yellow+12 Volt Constant
Red+12 Volt Accessory
Orange/WhiteIllumination/Dimmer
BlackGround
BluePower Antenna
Blue/WhiteAmp Turn-On
GreenLeft Rear Speaker +
Green/BlackLeft Rear Speaker -
VioletRight Rear Speaker +
Violet/BlackRight Rear Speaker -
GrayRight Front Speaker +
Gray/BlackRight Front Speaker -
WhiteLeft Front Speaker +
White/BlackLeft Front Speaker -
Light GreenParking Brake
Blue/PinkVehicle Speed Sensor
Green/PurpleReverse Wire
BrownMute Wire
Black/YellowOnStar Level Adjustment

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Its the product I need and Crutchfield was the cheapest out of 4 places[ Donovan  Aug 17, 2017 ]
Need this[ Temarlin  May 12, 2016 ]

1 question already asked

It does not. We do not carry harnesses that allow you to bypass the parking brake lock out of video on the screen of the receiver. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101 [ Paul  Sep 18, 2017 ]  Staff
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