My Bonneville has the Onstar system on it. Now where is the little box like the 2005 Impala I saw today had in trunk? It had a small box that said Onstar on it and had the same lil stick attenna. Do I have that box or chip on mine? If I do it is not in front side of the trunk like a new Impala. (2005) Any suggestions where to look?
Yes, remove the front cover piece in the trunk, this will expose the upper rear seat & framing. On the right side you should locate the Celluar Communications Module (45 degree angle I think). It'* a silver colored module IIRC.