For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B0051 : Deployment Commanded

### Circuit/System Description

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.

### Conditions for Running the DTC

The SDM must be powered up.

### Conditions for Setting the DTC

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

### Action Taken When the DTC Sets

• | The SDM commands the AIR BAG indicator ON via class 2 serial data.

• | The SDM records crash data.

### Conditions for Clearing the DTC

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

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

SIR Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. If there are signs of an air bag deployment inspect the vehicle for signs of impact or collision. Replace all components as required after an accident.
2. Replace the inflatable restraint SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Control Module References for SDM replacement, setup, and programming

• | SIR/SRS Wiring Repairs