DeVille DHS V8-4.6L VIN Y (2000)
Inflatable Restraint Sensing and Diagnostic Module: Description and Operation
Inflatable Restraint Sensing and Diagnostic Module
The inflatable restraint Sensing and Diagnostic Module (SDM) performs the following functions in the SIR system:
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Energy Reserve - The SDM maintains 23 Volt Loop Reserve (23VLR) energy supplies to provide deployment energy. Ignition voltage can
provide deployment energy if the 23 Volt Loop Reserves malfunction.
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Frontal Crash Detection - The SDM monitors vehicle velocity changes to detect frontal crashes that are severe enough to warrant deployment.
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Frontal Air Bag Deployment - During a frontal crash of sufficient force, the SDM will cause enough current to flow through the frontal inflator
modules to deploy the frontal air bags.
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Frontal Crash Recording - The SDM records information regarding the SIR system status during a frontal crash.
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Side Impact Crash Detection - The SDM communicates with both inflatable restraint Side Impact Sensors (SIS) and monitors the vehicle side
accelerations/decelerations to determine if during a side crash event side air bag protection are needed for Driver and/or Passenger.
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Side Air Bag Deployment - During a side impact crash of sufficient force, the SDM will cause enough current to flow through the side inflator
modules to deploy the side air bags.
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Side Impact Crash Recording - The SDM records information regarding the SIR system status during a side impact crash.
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Rear Side Impact Crash Detection - The SDM communicates with both inflatable restraint side impact sensors (SIS) and monitors the vehicle side
accelerations/decelerations to determine it during a side crash event side air bag protection are needed for Driver and/or Passenger.
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Rear Side Air Bag Deployment - During a side impact crash of sufficient force, the SDM will cause enough current to flow through the side
inflator modules to deploy the side air bags.
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Rear Side Impact Crash Recording - The SDM records information regarding the SIR system status during a side impact crash.
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Malfunction Detection - The SDM performs diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit
malfunction, the SDM will set a Diagnostic Trouble Code (DTC).
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Malfunction Diagnosis-The SDM displays SIR Diagnostic Trouble Codes (DTC) and system status information through the use of a scan tool.
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Driver Notification - The SDM warns the vehicle driver of SIR system malfunctions by controlling the AIR BAG warning indicator.
The SDM sends a message over the class 2 serial data line requesting to turn on the AIR BAG warning indicator.
The SDM connects to the SIR wiring harness using a 34-way connector.
The SDM receives power whenever the ignition is ON.
