BPP Sensor Calibration
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Navigate on the Tech 2 to Vehicle Control Systems > Computer/Integrating Systems > Module Setup > Body Control Module > BPP Sensor Calibration, then follow the instructions on the screen.