[hyperboimmv]

I think the cellular unit I am talking about is different. CadillacSTS2003, do you know if the cell kit in the 98 has the same connections as the onstar kit? I guess I could look the wires up at least and could probably hack something together.

And as far as I know this module should work on any gm car with analog onstar. If this is your board, I'd patent it and post on every gm forum. You'd make a mint.