Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1001 is an indication that the restraints ID stored in both the BCM and the SDM do not match or that the VIN stored in the BCM does not match the VIN stored either in the SDM or in the radio. If any of the modules mentioned above were previously replaced, the replaced module needs to be reprogrammed for proper operation.