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Opening the Unit
If you have Questions or Comments, please post in the Onstar Discussion Forum. I do check this.
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Now you are ready to open your unit. Let's place it down on the desk or bench in this direction and using a small screwdriver, open the lid. It is not held on by any screws or anything.
A pry here and there will get the top to come off.
Now, take a look at the board. You should see the four points where the oncore board mounts, and your 10 pin interface plug solder. If you do not see this, you probably took off the wrong cover. No big deal, snap it back on and do the other side
Now if you want to be double sure that you have the Oncore GT+ board in your system, take out that top board by removing this screw...
And removing the antenna connection........
It takes a little work to get it out but it will. Inside you will see a small silver box about the size of a pack of cigarettes. Pry the top off if it.
Now, go to the Oncore User guide and look and compare the small board inside. Some boards might be using an M12 board. If so, your pin outs will be different.
Like I said at the beginning, this is based on a 2002 Avalanche and I am learning that there are some Sony units out there as well, with which I can't help you with at this time..
© Jonathan Hine 2003
