Communication Interface Module Replacement
WARNING: This page is about a different car, the 2005 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
If the OnStar(R) communication interface module is replaced, the setup procedure needs to be performed. Please refer to OnStar Reconfiguration (Gen 6) or OnStar Reconfiguration (Gen 6.1) in Cellular Communication.