Hummer H3. Manual — part 578

DTC B0051

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.

10

1. Turn OFF the ignition.

2. Replace the sensing and diagnostic

module (SDM). Refer to Control
Module References for replacement,
setup and programming.

Did you complete the replacement?

Go to Step 11

-

11

1. Connect all SIR components.

2. Turn ON the ignition, with the engine

OFF.

3. Use the scan tool in order to clear the

DTCs.

4. Operate the vehicle within the

Conditions for Running the DTC as
specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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 Procedures

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM replacement, setup and programming

SIR/SRS Wiring Repairs

DTC B0053

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 B0053

Deployment Commanded with Loop DTCs Present

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. DTC B0053 will set instead of DTC B0051
when a deployment occurs while an inflator circuit fault is present that may result in a non-
deployment situation in one or more of the inflator modules.

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
faults present.

Action Taken When the DTC Sets

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

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

The SDM records crash data.

Conditions for Clearing the DTC

DTC B0053 is a latched code. You cannot clear a latched code. Replace the SDM after
following the instructions in the circuit/system testing.

Diagnostic Aids

When DTC B0053 is accompanied by additional DTCs (other than DTC B0051), repair the
malfunction causing the other DTCs before replacing the SDM.

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

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.

Replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM replacement, setup and programming

SIR/SRS Wiring Repairs

DTC B0057, B0058 OR B0059

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3