Circuit Description
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Ignition switch supplies ignition voltage to Sensing and Diagnostic Module (SDM) connector terminal A1 via SRS fuse, located in under hood fuse block, above left wheel well. When ignition is turned on, SDM commands Instrument Panel Cluster (IPC) to flash AIR BAG warning light to flash 7 times, during which time SDM checks SIR system for malfunctions. If no malfunctions are present, SDM will command IPC to turn AIR BAG warning light off.