Circuit/System Description

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When the ignition is turned ON, the Passenger Presence Module and the Inflatable Restraint Sensing and Diagnostic Module performs tests to diagnose critical malfunctions. When the Inflatable Restraint Sensing and Diagnostic Module has completed the power-up mode, the Inflatable Restraint Sensing and Diagnostic Module will establish communication with the Passenger Presence Module. The Inflatable Restraint Sensing and Diagnostic Module will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. If the Inflatable Restraint Sensing and Diagnostic Module determines the correct Passenger Presence Module is installed and functioning normally, the Inflatable Restraint Sensing and Diagnostic Module will illuminate the passenger air bags ON or OFF indicator based on messages from the Passenger Presence Module. The Inflatable Restraint Sensing and Diagnostic Module sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF indicator.