Diagnostic Aids
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
If a loss of Class 2 serial data communication occurs between SDM and BCM, BCM will command IPC to turn AIR BAG warning light on. If SPI data is lost between BCM and IPC, IPC will turn AIR BAG warning light on.
NOTE:
For circuit number and wire color identification, see WIRING DIAGRAMS .