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

by Metra

Product Details

• Product Dimensions: 6.5 x 8.5 x 2 inches ; 11 ounces
• Shipping Weight: 1 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000980HC4
• Item model number: GMOS-04
• Average Customer Review: 3.1 out of 5 stars  See all reviews (14 customer reviews)

Product Description

Class II OnStar Interface for Amplified Systems

Customer Reviews

Most Helpful Customer Reviews

2 of 2 people found the following review helpful:

5.0 out of 5 stars Worth the money, January 20, 2011

By 

Jeff McClain - See all my reviews
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Amazon Verified Purchase

This review is from: Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems (Electronics)

This product is worth every penny for the right installation (i.e. if you have amplified existing system - for me a Bose stock upgraded Chevrolet Silverado 2005 truck with OnStar). Trying to replace the stock system without this is difficult, even if you are ok with losing functionality of door chimes, RAP (delayed stereo powered on after turning ignition off), and OnStar (worth very little to me, as I don't pay for the service any more). It also displaces the need for a 24-pin wiring harness, so you save $15 there and the instructions work very well. The biggest thing is getting a cable that interfaces the preamp outputs to the amp inputs in the existing system. I was seriously looking at having to pull the stock amp and speaker routings out without this unit.

2 of 2 people found the following review helpful:

5.0 out of 5 stars Works like a charm, July 21, 2010

By 

Gary R. Randolph (Tampa area, Florida USA) - See all my reviews
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Amazon Verified Purchase

This review is from: Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems (Electronics)

This devise does exactly what it was supposed to do. Made installing Pioneer AVIC-X920bt in my Hummer easy.

2 of 2 people found the following review helpful:

5.0 out of 5 stars Great Item!, March 4, 2010

By 

Nicholas Feilner "Nick" (St. Charles, MO) - See all my reviews
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This review is from: Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems (Electronics)

I've used these harnesses as well as the GMOS-01 harnesses over the years to today as I install radio's professionally. I've always ordered the GMOS-01 and GMOS-04 harnesses on here as where if you go to a retail store to purchase it. Cost is well over $100.

As for the other people's negative reviews on this product, claiming the harnesses are defective. More than likely it was human error to why they never worked for them. From as I've seen in the shop I use to work in and from what I see when I get called out to a customers house for a onsite repair. With the GMOS-04, people tend to automatically declare there harness being defective, for a couple reasons. One they incorrectly wire up there constant, accessory wires incorrectly and wont power on. Second (most common) problem to typically hear is that sound isnt being distributed to all speakers. As for the GMOS-04, obviously seeing you had 4 RCA hookups for your audio. Common do it yourself installer will have a headunit where they wont have the dual (front/rear) preouts on there headunit. If you go low grade or not careful you can buy headunits that only have Rear/Subwoofer Preouts (no front) and thats it. Obviously only getting half the audio and confusing the consumer and creating frustration thinking the harness is defective. As well there is audio adjusting screws for not just the door chimes but for the output for the audio and the screws are plastic and extremely fragile.

Best thing I recommend for this product is to take it to a professional installer.