Hi,
I just disabled the on-star. I don't like the light, and don't want my son mess around with the buttons.
It is pretty easy. Open the hood, and open the fuse box. Find fuse 31 (They are so good to print all fuse illustration on the fuse cover, just find the one marked "Mayday" and pop it off.
Et voila, the on-start is gone.
You can put the fuse to a socket marked "empty", since there is no contact in the socket, so it is safe.
Cheers,
Tony