Diagnostic Aids
WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Because VIN is not removable and DTC B1015 is an internal VIN error, try reentering the VIN information. If VIN is still incorrect, BCM must be replaced and properly reprogrammed.