Air Bag Indicator

The IPC illuminates the air bag indicator when the following occurs:
^ The inflatable restraint Sensing And Diagnostic Module (SDM) detects a malfunction with the supplemental inflatable restraint system. The IPC receives a class 2 message from the SDM requesting illumination.
^ The IPC performs the displays test at the start of each ignition cycle. The IPC flashes the air bag indicator 7 times.
^ The IPC detects a loss of class 2 communications with the SDM.

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 is supplied with ignition 1 voltage and the IPC flashes the AIR BAG indicator seven times. While flashing the indicator, the SDM conducts test on all SIR system components and circuits. If no malfunctions are detected the SDM will communicate with the IPC through the class 2 serial data circuit and command the AIR BAG indicator OFF. The SDM provides continuous monitoring of the air bag circuits by conducting a sequence of checks. If a malfunction is detected the SDM will store a Diagnostic Trouble Code (DTC) and command the AIR BAG indicator ON. The presence of a SIR system malfunction could result in non-deployment of the air bags. The AIR BAG indicator will remain ON until the malfunction has been repaired.