Circuit Description
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.
When ignition is turned on, Sensing and Diagnostic Module (SDM) commands Instrument Panel Cluster (IPC) to flash AIR BAG warning light 7 times while SDM checks SIR system for malfunctions. If SIR system is normal, AIR BAG warning light will then turn off.