Hummer H3. Manual — part 580

Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Open

DTC B0068

Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range

Diagnostic Fault Information

DTC B0061, B0062 or B0068

Circuit/System Description

The driver roof rail deployment loop consists of an inflatable restraint roof rail module - left and
the roof rail module high and low circuits. A shorting bar used within the roof rail module
connector shorts together both the roof rail module high and low circuits when the connector is
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

B0061

DTC B0061 will set when the roof rail module-left deployment loop resistance is less than 1.3
ohms for 500 milliseconds.

B0062

DTC B0062 will set when one of the following conditions occurs:

Circuit

Short to

Ground

High

Resistance

Open

Short to

Voltage

Signal

Performance

Roof Rail Module - Left
High Circuit

B0068

B0068

B0062

B0068

B0061

Roof Rail Module - Left Low
Circuit

B0068

B0068

B0062

B0068

B0061

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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

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

B0068

DTC B0068 when one of the following conditions occur:

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

Roof rail module-left high circuit is less than 2.4 volts and roof rail module-left 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

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-left high and low circuits

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

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

The roof rail module-left connector

The SDM connector

A malfunctioning roof rail module

A malfunctioning SDM

Reference Information

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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.

J 38715-50 Load Tool Adapter

Circuit/System Testing

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

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

damage or corrosion.

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

If the roof rail module - left 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-left 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 B0061,

B0062 or B0068 are set in history.

If DTC B0061, B0062 or B0068 is history replace the roof rail module - left.

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

Tools.

6. Remove the SDM connector. Inspect the SDM connector for damage or corrosion that may

cause a malfunction in the roof rail module-left high and/or low circuits.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

If damage or corrosion is found make the appropriate repair.

7. Test the high and low circuits between the SDM and roof rail module - left 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 B0064, B0065 OR B0066

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 Descriptors

DTC B0064

Left Front/Driver Pretensioner Deployment Loop Resistance Low

DTC B0065

Left Front/Driver Pretensioner Deployment Loop Open

DTC B0066

Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

Diagnostic Fault Information

DTC B0064, B0065 or B0066

Circuit

Short to

Ground

High

Resistance

Open

Short to

Voltage

Signal

Performance

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3