There are two main hardware pieces to OnStar. GM calls them the Vehicle Interface Unit (VIU) and the Vehicle Communications Unit (VCU). The VIU is the computer that controls OnStar, and this is where the GPS unit is located. The VCU is the cell phone/modem that transmits the data to the OnStar call center. The VIU is the main thing we're interested in - cause we want to get to the GPS.
If you have a Chevy Blazer, this is easy. It is in the rear cargo area, on the passenger side. There is one simple clip to flip, and you're there. It's easier to get to than the jack and lug wrench.
I don't have any other vehicles with OnStar. So if you don't have a Blazer, I honestly don't have a clue where the VIU (or VCIM) is located in your vehicle.
* Darren Wright has graciously offerred to help anyone who would like the location and instructions to get to their VIU. You can send him an email requesting this information at dawright@shaw.ca. As he finds the information, I will update this site with an archive of the instructions for each vehicle.
If you have a suburban, read this... Re: OnStar location (Although I wonder if this refers to the VCU and not the VIU. Either way, I assume if you find one the other is nearby.)
If none of this helps, all I can say is search the web and newsgroups... If you know where the VIU is located in any additional vehicles, let me know and I'll post it.
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