Bulb Test

The Instrument Panel Cluster (IPC) will flash the air bag warning lamp indicator 7 times when the ignition switch is turned from OFF to ON. The inflatable restraint Sensing and Diagnostic Module (SDM) then commands the IPC to turn the warning indicator OFF through serial data communication. This indicates that there are no malfunctions in the SIR system. If a SIR system malfunction is present, the IPC flashes the warning indicator seven times and the SDM then commands the IPC to turn the warning lamp indicator ON. An IPC malfunction could prevent the IPC from flashing the indicator.