I qualified for an upgrade to my onstar module the new one I got installed has the LTE/wifi with it however after 2 trips to the Chevrolet dealer it still doesn't work! The mechanic told me there is a problem with the "high speed line" and the odb tool will not update or activate the onstar module due to this, he said it could take hours of ripping the dash apart to locate the problem

So I am looking to locate the XM factory module in hopes of tracing the lines back to see if there are any tears etc