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Originally Posted by jaysonsperling
With OnStar, these units have to be installed at the factory. From what I understand, it interfaces with so much stuff (sensors, relays, etc), including the vehicle's computer, that I don't see how an aftermarket installation would work properly.
Visiting the OnStar page, they say that they do not sell an aftermarket kit that can be installed; it can only be done when new vehicles.

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Thanks Jay,
I read that as well. I figured if I was to install one, it would be from a junked Lumina and get all of the cables, connectores and hardware. It's [robably not worth the effort to get it out.
I may be able to put in a homelink. Does anyone know what to use? I have seen some of the small ones on Ebay that you can mount into your visors if you have power. Does anyone have a pic or part number for Homelink on a 1999 LTZ?
I also did research on getting a factory CD unit with XM. Apparently from everyone I speak to, you can go after market but not factory.
Thanks!
Corndog