Lots of photos, worth a looksee
http://www.i-hacked.com/content/view/15/45/At the heart of this system is a GPS receiver, manufactured by Motorola, called the Oncore. Once you make a serial connection to this Oncore GPS, you can recieve real-time positioning information on your Laptop or PDA - In either Motorola's proprietary (but well documented) format, or in standard NMEA format.
I also found this one
http://www.openminds.net/onstar/
and
http://slashdot.org/articles/03/12/26/1 ... ml?tid=126
or
http://www.coastaletech.com/onstar.htm
demo and photos of the Onstar lockpick here
http://ridersontheweb.com/avalanche/bluetooth.htm
DNR