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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

Item # 120GMOS13

Your Cadillac is a comfortable, powerful vehicle, but the factory stereo leaves something to be desired.

Find what Fits your car

Your Cadillac is a comfortable, powerful vehicle, but the factory stereo leaves something to be desired.

Item # 120GMOS13

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C$119.99
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About 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.

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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

Customer reviews

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Axxess GMOS-13 Wiring Interface reviews

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7 reviews

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Axxess GMOS-13 Wiring Interface

Crutchfield customer from Brooksville, FL on 7/7/2019

2007 Cadillac STS

Verified customer (What's this?)
Verified employee purchase (What's this?)

With this do I still need a steer wheel control

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Axxess GMOS-13 Wiring Interface

Crutchfield customer from Broomall, PA on 2/24/2019

2008 Cadillac STS

Verified customer (What's this?)
Verified employee purchase (What's this?)

Did not work in my car. Getting a blue tooth speaker and will use my phone

Pros:

Cons:

Crutchfield response on 2/25/2019
We're sorry this interface didn't work out for you. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Customer Support team at 1-800-955-9091. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

0 of 0 found this helpful

Wonderful

James from Clayton, NC on 5/22/2018

2008 Cadillac STS

Verified customer (What's this?)
Verified employee purchase (What's this?)

Install was easy product works well in my STS love it.

Pros: great instructions for a novice

Cons: mone

Crutchfield response on

2 of 2 found this helpful

Easy to install

Jonathon from Brighton, TN on 8/2/2017

2005 Cadillac STS

Verified customer (What's this?)
Verified employee purchase (What's this?)

Installed easy and directions were easy to follow as well.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Great

Mike from York, pa on 3/22/2016

2005 Cadillac STS

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works great very happy I purchased this item

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Kenwood for My Cadillac

Crutchfield customer from Waldorf Md on 9/29/2013

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works just fine. Met my expectations

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Works well

Crutchfield customer from Cypress, TX on 6/24/2013

Verified customer (What's this?)
Verified employee purchase (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

Crutchfield response on

1 of 1 found this helpful

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More details on the Axxess GMOS-13 Wiring Interface

Stacey B.

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.

Make Model Year
Cadillac
STS 2006-2009

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 Color Function
Yellow +12 Volt Constant
Red +12 Volt Accessory
Orange/White Illumination/Dimmer
Black Ground
Blue Power Antenna
Blue/White Amp Turn-On
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
White Left Front Speaker +
White/Black Left Front Speaker -
Light Green Parking Brake
Blue/Pink Vehicle Speed Sensor
Green/Purple Reverse Wire
Brown Mute Wire
Black/Yellow OnStar Level Adjustment

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Its the product I need and Crutchfield was the cheapest out of 4 places [ Donovan  Aug 17, 2017 ]
A
Need this [ Temarlin  May 12, 2016 ]

2 questions already asked

Q
I have been reading forums about the factory head unit in the Cadillac STS. So far, I've heard that the stereo systems activates or deactivates various personalization settings such as: door locking, seat recall positions, headlamp delay, factory security system, and many other integrations that can be lost if replaced. Will this wiring interface be able to keep all of these features? Thanks in advance
[ Anthony  Jan 01, 2018 ]
2 answers
A
No it will not, whatever the settings you have set before you connect the radio will still have. It does not allow you to personalize the vehicle like the factory unit. Hope that helps
[ scott  Jan 03, 2018 ]
A
When I replaced the factory system I lost all of those features. It wasn't a big deal for me cause I didn't use them that much. I will say that it seemed like when I replaced it, the settings as I had them set stayed but I could not longer go back in and change them.
[ Daniel  Jan 01, 2018 ]
Q
Does this have a bypass in it to be able to watch movies while car is out of park?.. 2005 Cadillac sts
[ Jason  Sep 16, 2017 ]
1 answer
A
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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