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 and overview of each diagnostic category.

### DTC Descriptors

DTC B0052 00: Deployment Commanded
DTC B0053 00: Deployment Commanded with Loop DTCs Present

### Circuit/System Description

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 two 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 causing DTC B0052 to set.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

#### B0052

• | The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal modules.

• | The SDM detects a side impact of sufficient force to warrant deployment of a side impact module and/or roof rail module.

• | The SDM has deployed the seat belt pretensioner for 3 separate deployments.

#### B0053

SDM commands the inflator deployment with loop faults present.

### Action Taken When the DTC Sets

• | The PPS will set a DTC, and then communicate with the SDM.

• | The SDM will set DTC B0081.

• | The SDM disables the I/P module deployment loop.

• | The PPS will illuminate the passenger air bag status OFF indicator.

• | The SDM requests the instrument cluster panel (IPC) to illuminate the AIR BAG indicator.

### Conditions for Clearing the DTC

These DTC will not clear. The SDM must be replaced.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

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

• | SDM

• | SDM wiring harness

1. Verify that DTC B0052 is not set.

⇒ | If the DTC is set, replace the SDM.

2. Verify that DTC B0053 is not set.

⇒ | If the DTC is set as current, clear the DTC. If the DTC resets, replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM replacement, setup, and programming