For 1990-2009 cars

The SDM contains a sensing device that converts the vehicle velocity changes to an electrical signal. the electrical signal is generated by the SDM and compared to a value stored in the memory. When the generated signals exceed the stored values, the SDM deploys the air bags and stores a DTC in its memory.

### Conditions for Setting the DTC

DTC B0051 sets when the SDM commands the inflator modules to deploy the air bags. The following conditions must be met to set this DTC.

• | The ignition voltage is present at the SDM and continuous.

• | The SDM detects a frontal or side impact.

• | The impact was of sufficient force to warrant deployment of the air bags.

### Action Taken When the DTC Sets

• | DTC B0051 will set.

• | The air bag telltale will be on.

• | The DTC is latched in SDM memory.

### Diagnostic Aids

• | Always start diagnosis of the SIR DTCs with an inspection of the vehicle, including its wiring and the SIR components for visible damage.

| Important: DTC B0051 is a latched code and can not be cleared from SDM memory.

• | Always replace the SDMs with DTC B0051 set, only after all collision repairs have been completed.

• | Always perform the Diagnostic System Check - SIR procedure before using this chart.

### B0051