Malfunction Lamp / Indicator: Description and Operation

AIR BAG INDICATOR

The AIR BAG indicator, located in the instrument panel cluster (IPC) is used to notify the driver of supplemental inflatable restraint (SIR) system malfunctions and to verify that the inflatable restraint sensing and diagnostic module (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 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 in the event of a collision, or deployment of the inflator modules the event of a collision. The AIR BAG indicator will remain ON until the malfunction has been repaired.