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.

The AIR BAG indicator is the key to driver notification of SIR system malfunctions. The AIR BAG indicator is used to inform the driver of the proper operation of the SIR system. The SDM uses the AIR BAG indicator to do the following:
^ Verify proper SIR system operation by commanding the AIR BAG indicator OFF via Class 2 serial data.
^ Warn the driver of SIR system malfunctions, which could potentially result in one or more of the following conditions:
- Deployment of the frontal inflator module(s) without a frontal crash;
- Deployment of the side impact inflator module(s) without a side crash;
- Non-deployment of the frontal inflator module(s) in the event of a crash;
- Non-deployment of a side impact inflator module in the event of a side crash; or
- Deployment of an inflator module(s) for conditions less severe than intended.