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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.

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

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4 questions - 7 answers

Item # 120GMOS13

About the Axxess GMOS-13 Wiring Interface

Jon Paul
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
MFR #GMOS-13

Customer reviews for Axxess GMOS-13 Wiring Interface

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4.5 out of 5 stars
19 reviews

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More details on the Axxess GMOS-13 Wiring Interface

Stacey B.

Product Research

Features

Vehicle Compatibility: The GMOS-13 interface is designed to let you replace the OEM radio in a 2006-2009 Cadillac STS with an aftermarket in-dash receiver.

Radio Replacement Interface: The GMOS-13 interface retains 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).

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.

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Customer Q&A

4 questions already asked

Q
Do i need SWC with this also?
dnell  Dec 23, 2020
3 answers
A
I did, but depending on your make & model I'd do my due diligence... be on the safe side.
daniel  Jan 02, 2021
A
Yes. The gmos-13 interface is just for replacing your factory stereo with an aftermarket one. You still will have to get the SWC.
james  Dec 23, 2020
A
Yes, you should also get the swc the gmos harness allowed me to keep my factory amp and my warning chimes.
jeffrey  Dec 23, 2020
Q
Do i need SWC harness with this also?
dnell  Dec 23, 2020
1 answer
A
If u have steering wheel controls and want to use them u will need the swc harness also. I paid extra for crutchfield to pre wire the system so all i had to do was plug it in, well wortg the
jonathan  Dec 23, 2020
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
jason  Sep 18, 2017 (Staff)

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