OnStar GM Microphone and OnStar Microphone Adapter Radio Schwarttzy Hummer H3

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  1. Hi there,

    First, I would like to thank you for the precious and highly valued website(its really meant a lot to me as a hummer h3 owner).

    I was lloking forward to purchase the OnStar Microphone Adapter from your website but i was wondering if i can install it since it is not there in my car.


    I already bought Metra GMOS-04 Wiring Interface complete set which supports Onstar. As i am looking forward to purchase after market stereo in my local country(Saudi Arabia).

    thank you.

    1. Hey Anas!

      The adapter only uses the microphone and will work just fine without any other OnStar equipment.

      Meaning you could get an GM Microphone, Install it into none OnStar equipped H3 Hummer and it would work just fine.

      1. I’m missing the cover for my Onstar opening in my headliner. I have the wiring but somehow when an aftermarket radio was installed, the cover was lost. Does your adapter have the cover?

  2. I am wondering with this adapter, will the microphone be disabled for onstar? I have an aftermarket headunit and the PAC RP5 GM11 wiring kit which supports onstar. I don’t want to use the microphone that came with the radio. I’d like to use the onstar microphone, but I want to keep the functionality of onstar as well.

    1. Hey Mike,

      I got the order. Working on making more of them right now. They’ll ship out tomorrow with USPS 3-Day Priority Select and should have it by Friday.

    1. Well, I have had many customers or it and seems to work fine. Just remember that I don’t have the ability to set all the different radios out there and heavily recommend Sony.

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