Circuit Description
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
When ignition switch is turned to RUN position, Instrument Panel Cluster (IPC) compares restraints identification stored in IPC to restraints identification stored in Sensing and Diagnostic Module (SDM). Then, SDM and IPC compare Vehicle Identification Number (VIN), stored in each unit.