Bulb Test

The Instrument Panel Cluster (IPC) will flash the air bag warning lamp 7 times when the ignition switch is first turned to the RUN position. The inflatable restraint Sensing and Diagnostic Module (SDM) then commands the IPC to turn the warning lamp 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 lamp seven times and the SDM then commands the IPC to turn the warning lamp ON. An IPC malfunction could prevent the IPC from flashing the lamp.