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  • Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems
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Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems

by Metra
| 16 answered questions

Price: $78.00 & FREE Shipping
Only 10 left in stock.
Ships from and sold by DiscountCentralOnline.
  • OnStar Interface for Amplified GM Systems, Retains RAP feature,Retains OnStar with adjustable volume output
  • 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
  • Retains chime with adjustable volume output,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.
  • Compatible with amplified GM vehicles
  • Compatible with the following vehicle: Buick: 2005 - 2007 Allure.2004 - 2005 Century. 2005 - 2007 .For amplified audio systems premium and Bose
  • OnStar Interface for Amplified GM Systems, Retains RAP feature,Retains OnStar with adjustable volume output
  • 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
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$78.00 & FREE Shipping Only 10 left in stock. Ships from and sold by DiscountCentralOnline.

Frequently Bought Together

Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems + Metra 40-GM10 GM Antenna Adapter + Metra 95-2001 Double DIN Installation Dash Kit for Select 1990-Up GM Vehicles
Price for all three: $92.95

These items are shipped from and sold by different sellers.

Buy the selected items together


Product Information

Technical Details
Item Weight1.8 ounces
Product Dimensions9 x 6.8 x 2.5 inches
Item model numberGMOS-04
Warranty1 Year
Weight8.80 Ounces
  
Additional Information
ASINB000980HC4
Shipping Weight8.8 ounces (View shipping rates and policies)
ShippingCurrently, item can be shipped only within the U.S.
Date First AvailableOctober 2, 2001
  
Warranty & Support
Warranty, Parts: Parts

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
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Product Description

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 Update interface compatible. Navigation outputs now included. Authorized Internet Dealer.1-year Manufacturer's warranty. Check the Product Instructions to see basic instructions and compatibility list for the Metra GMOS-04.Compatible with the following vehicle: 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

Customer Questions & Answers

Customer Reviews

Worked great was easy to install.
James Greene
Door chimes and onstar work great, had to adjust the volume a few times, but sound good to me.
DJTJ
I had already cut the wires on the harness before I realized it was the wrong connector.
Sam Athanassov

Most Helpful Customer Reviews

25 of 26 people found the following review helpful By Zax on October 28, 2013
Verified Purchase
I used this interface on my 2005 Silverado **WITH the Bose system AND Onstar**, and I soldered and heatshrinked all of my connections between this interface and my aftermarket Pioneer AVH-X4500BT wiring harness.

Wiring of the harness looks overwhelming, but it really is not that bad. However, unless Axxess has updated their manual recently, (it was not on their paper manual or their online manual during my stereo install on October 16, 2013), there are a couple of wires on their harness that they left out and it made initial harness setup a bit more confusing.

The first item is on the 16 pin harness, their manual states to connect the red wire to the aftermarket radio ignition wire. If you look at the 16 pin harness, you'll notice that there is not one, but TWO identical red wires. I called Axxess support and they informed me to connect both red wires together, and connect that to your radio's ignition wire.

The 2nd item(s) is on the 24 pin harness. There are two wires they do not mention... orange and and orange/white. I called Axxess support and they informed me that these are not to be used on newer vehicles, so I capped them with heatshrink to make sure they would not short to anything.

**** UPDATE ****
It looks like their online manual has been updated. They now mention BOTH red wires of the 16 pin harness instead of only one. However, they still do not mention the two extra orange wires on the 24 pin harness.
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11 of 12 people found the following review helpful By dodgeballs on November 30, 2011
Verified Purchase
First of all this is a necessity for installing a car stereo anymore. With all the various configurations in newer cars you don't want to go in and just start cutting plugs and wires. More specifically, with the Bose Lux models of GM trucks (mine is a 03 Denali, but I think Z71's and Denalis have this setup) it is required. The way the factory amps and head units talk on these vehicles, you need this adapter to wedge an aftermarket stereo into the equation. If you want to go fully aftermarket, you'll need to bypass the factory amps and subwoofer with new wiring, and install all new speakers.

That said, now that it's installed it works great. The gain knob on mine increases and decreases the stereo volume nicely, though the chime knob doesn't seem to change the volume of the "you left your keys in" chime at all. Maybe I'm listening for the wrong chimes.

Be aware that the instructions for this unit are very lacking. There are no photos or diagrams, and the directions are vague at best. I have installed a dozen or so stereos in my life, so I know a bit about what to do, but this was still slightly challenging. The biggest issue is actually that they have upgraded this harness over time (though there is no indication of WHICH GMOS-04 version you have received) and they have not updated the directions. So there are wires on the harness that are not mentioned in the directions.

Of particular note, I also bought a Metra Axxess ASWC Universal Steering Wheel Control Interface (Black) which is made by the same company. They were nice enough to actually do most of the wiring for that unit for you in the GMOS-04.
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4 of 4 people found the following review helpful By Brenton E. Burke on November 25, 2013
Got the module, the instructions aren't great, but it's a fantastic product. The extra black connector on the harness is for Metra's steering wheel control. ASWC. Fantastic combo, but when adjusting keep this in mind: The potentiometer does affect both chimes and audio level control. If you adjust this knob, you'll effectively decrease the whole volume of the system. Like turning the gain down on the whole thing, chimes and all.

What you need to do is adjust the chimes with the vehicle off and the key in the ignition with the door open. After you have the chimes where you want them, pull the key from the ignition, reset the potentiometer to the middle, then start the vehicle and adjust the audio level where you want it.
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2 of 2 people found the following review helpful By hdhuntr on November 24, 2014
Verified Purchase
This works well in my 05 Tahoe with Bose and no onstar. My only complaint with gms04 is now the door chimes are kind of loud - I had to adjust the gain for decent volume from the jvc unit I installed. I tried the gms 01 unit which with the level adjustment gave hardly any volume.

It is for low level output so the stereo you are installing will need audio out jacks or you'll need an adapter to drop your speaker outputs to line out levels.
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2 of 2 people found the following review helpful By Anthony R. Vacchio on September 23, 2013
Verified Purchase
easy to install just need to really read everything through. if you get the steering wheel moduale note plug comes with this system
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1 of 1 people found the following review helpful By Steven Cuttic on April 9, 2014
Verified Purchase
It works good now but I had to cut the pink wire from the large harness that goes to the aswc plug and splice it to the pink wire for the aswc plug. After hours of trying to get the aswc to work with no success I called the help line and the tech had me up and running in less than 2 min and the aswc worked perfectly. He said it's a common problem on the GMOS harness. I also had to open up the GMOS and solder the volume connection better. It wasn't making good contact by the little blue knob and I had to turn my radio up to 30 in order to hear it. After I soldered the blue volume control both onto the board better, I now have plenty of volume at 12 and 13.
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