Impala V6-3.8L VIN K (2004)
Malfunction Lamp / Indicator: Description and Operation
AIR BAG INDICATOR
The AIR BAG indicator, located in the IPC is used to notify the driver of SIR system malfunctions and to verify that the SDM is communicating with the
IPC. When the ignition is turned ON, the SDM and the IPC are supplied with ignition 1 voltage. The IPC responds by flashing the AIR BAG indicator
seven times. While the IPC is flashing the AIR BAG indicator, the SDM conducts tests on all SIR system components and circuits. If no malfunctions
are detected, the SDM will command the IPC to turn the AIR BAG indicator OFF via Class 2 serial data. The SDM provides continuous monitoring of
the inflator module circuits by conducting a sequence of checks. If a malfunction is detected, the SDM will store a diagnostic trouble code (DTC) and
command the IPC to turn the AIR BAG indicator ON via Class 2 serial data. The presence of a SIR system malfunction could result in non-deployment
of the inflator modules. The AIR BAG indicator will remain ON until the malfunction has been repaired.
