Air Bag Indicator Circuit Malfunction

Circuit Description The ignition switch supplies battery voltage to the inflatable restraint sensing and diagnostic module (SDM) at terminal A1 using the SIR Fuse. The ignition switch also supplies Ignition 1 voltage to the instrument panel cluster (IP). The AIR BAG warning indicator is controlled by the SDM via Class 2 serial data. When the ignition switch is first turned ON, the SDM responds by performing tests on the SIR system and then commanding the AIR BAG warning indicator OFF after it has flashed 7 times if no trouble codes (DTCs) are found.