Communication Interface Module Replacement
WARNING: This page is about a different car, the 2006 Isuzu Ascender, 2006 GMC Envoy XL, 2006 GMC Envoy, 2006 Chevrolet TrailBlazer, and 2006 Buick Rainier. 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 in Cellular Communication.