Hummer H3. Manual — part 582

disconnected. This will help to prevent unwanted deployment of the inflator module during
servicing. During a side or frontal crash of sufficient force the inflatable restraint sensing and
diagnostic module (SDM) will allow current to flow through the deployment loop in order to
deploy the roof rail module. The SDM performs continuous diagnostic tests on the deployment
loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction
is detected, a diagnostic trouble code (DTC) will be stored in memory.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0069

DTC B0069 will set when the roof rail module-right deployment loop resistance is less than 1.3
ohms for 500 milliseconds.

B0070

DTC B0070 will set when one of the following conditions occurs:

Roof rail module - right high circuit is less than 2.4 volts and the roof rail module-right
deployment loop is more than 6 ohms for 500 milliseconds.

Roof rail module - right deployment loop resistance is more than 4.8 ohms for 500
milliseconds.

B0071

DTC B0071 when one of the following conditions occur:

Roof rail module - right high or low circuits are short to ground or short to voltage for 500
milliseconds.

Roof rail module - right high circuit is less than 2.4 volts and roof rail module - right
deployment loop resistance is less than 6 ohms for 500 milliseconds.

Action Taken When the DTC Sets

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

The SIR system is disabled and no deployments are allowed.

Conditions for Clearing the DTC

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTC
function is used.

A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

If there is more than one DTC set diagnose the open DTC first. The following are possible causes
of the malfunction:

A short between the roof rail module - right high and low circuits

An open or a high resistance in the roof rail module - right high or low circuits

A short to ground or a short to voltage in the roof rail module - right high or low circuits

The roof rail module- right connector

The SDM connector

A malfunctioning roof rail module

A malfunctioning 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

Special Tools Required

J 38715-A SIR Driver/Passenger Load Tool. See Special Tools.

EL 38715-125 Load Tool Adapter

Circuit/System Testing

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

1. With the ignition OFF, disconnect roof rail module-right connector.

2. Inspect the component and wiring harness sides of connector for the roof rail module-right

for damage or corrosion.

If the connector for the roof rail module-right is damaged, the roof rail module-right
must be replaced.

If the roof rail module-right wiring harness side connector is damaged, replace the
connector.

3. Use EL 38715-125 adapter to connect the J 38715-A SIR Driver/Passenger Load Tool to

the harness side of the roof rail module-right wiring harness connector. See Special Tools.
Use the PASSENGER INFLATOR connector located on the load tool.

4. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0069,

B0070 or B0071 are set in history.

If DTC B0069, B0070 or B0071 is history replace the roof rail module-right.

5. With the ignition OFF, disconnect and remove the J 38715-A and adapter. See Special

Tools.

6. Remove the inflatable restraint sensing and diagnostic module (SDM) connector. Inspect the

SDM connector for damage or corrosion that may cause a malfunction in the roof rail
module-right high and/or low circuits.

If damage or corrosion is found make the appropriate repair.

7. Test the high and low circuits between the SDM and roof rail module-right for a short to

voltage, short to ground or open/low resistance.

If circuits test good then replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Roof Side Rail Inflatable Restraint Module Replacement - Front

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup and programming

DTC B0077, B0078, B0079, B0080, B0081 OR B0082

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.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0077

Left Front/Driver Side Impact Sensor (SIS) Performance

DTC B0078

Right Front/Passenger Side Impact Sensor (SIS) Performance

DTC B0079

Incorrect Left Front/Driver Side Impact Sensor (SIS) Installed

DTC B0080

Discard Left Front/Driver Side Impact Sensor (SIS)

DTC B0081

Incorrect Right Front/Passenger Side Impact Sensor (SIS) Installed

DTC B0082

Discard Right Front/Passenger Side Impact Sensor (SIS)

Diagnostic Fault Information

DTC B0077, B0078, B0079, B0080, B0081 or B0082

Circuit/System Description

The inflatable restraint side impact sensor (SIS) utilizes a unidirectional 2-wire circuit. The SIS
modulates current on the interface to send ID, State of Health and deployment commands to the
inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and
a ground for the SIS. When the ignition is turned on and input power from the SDM is first

Circuit

Short to

Ground

High

Resistance

Open

Short to

Voltage

Signal

Performance

Side Impact Sensor Signal
Circuit Left/Right

B0077,

B0078

B0077,

B0078

B0077,

B0078

B0077,

B0078

B0077,

B0078

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3