The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners. DTC B0053 will set along with DTC B0052 when a deployment occurs while a circuit malfunction is present in any one of the deployment loops.

Ignition voltage is between 9-16 volts.

SDM commands the inflator deployment with loop faults present.

The SDM commands the AIR BAG indicator ON via serial data communications.

DTC B0053 is a latched code. The code cannot be cleared with the scan tool. Replacement of the SDM is required.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected .

Verify that DTC B0053 is not set.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM replacement, setup, and programming