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 inflator modules, deploying the side air bags and causing DTC B0055 to set. This DTC is set when the SDM has commanded an air bag deployment with no faults present.

Ignition voltage is between 9-16 volts.

DTC B0055 is a latched code and cannot be cleared.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Ignition OFF, Verify that the vehicle does not show any signs of side impact or frontal inflator module deployment.

⇒	If the vehicle displays any signs of inflator deployment, refer to Repairs and Inspections Required After a Collision .

2. With a scan tool verify DTC B0055 is not set.

⇒	If DTC B0055 is set, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.