The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts changes in vehicle velocity to an electrical signal. The SDM compares this 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 air bags and causing DTC B0051 to set.

The SDM must be powered up.

Ignition voltage must be present and the SDM must have commanded an air bag deployment with no faults present.

DTC B0051 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the circuit/system testing.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, inspect the vehicle for signs of inflator module or pretensioner deployment. Verify that the vehicle does not show any signs of inflator deployment.

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

2. Verify DTC B0051 is not reset.

⇒	If DTC is set, with a scan tool, clear DTCs. If the DTC resets, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.