Hummer H3. Manual — part 586

B0100 and B0103

A valid ID message is not received within 5 seconds of the EFS being powered up.

Status message is not received.

The SDM has failed twice to reset the EFS.

B0102 and B0105

The SDM has received an ID message from the EFS that does not match the ID stored in the
SDM memory.

When 2 EFS resets are attempted without the correct identification being detected by the
SDM.

B0101 and B0104

Will set when the SDM has received a NOK (Not OK) message from the EFS.

Action Taken When the DTC Sets

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

The SDM attempts to reset the EFS.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

Use the scan tool CLEAR DTC command.

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

Diagnostic Aids

The following can cause an intermittent condition:

A short between the EFS signal and voltage circuits

High or low resistance in the EFS signal and voltage circuits

Inspect the EFS signal and voltage circuits carefully for cutting and/or chafing.

Verify the correct EFS is installed in the vehicle.

Reference Information

Schematic Reference

SIR Schematics

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Connector End View Reference

SIR 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

Circuit/System Testing

1. Verify that DTC B0101, B0102, B0104 or B0105 are not set.

If DTC B0101 or B0102 is set replace the left EFS. If the DTC resets, replace the
SDM.

If DTC B0104 or B0105 is set replace the right EFS. If the DTC resets, replace the
SDM.

2. Ignition OFF, disconnect the harness connector at the applicable front end sensor and the

harness connector at the SDM.

If DTC B0100 is set disconnect the left EFS

If DTC B0103 is set disconnect the right EFS

3. Test for less than 1 volt between the signal circuit terminal 1 and ground.

If greater than the specified range, test the signal circuit for a short to voltage.

4. Test for infinite resistance between the signal circuit terminal 1 and ground.

If greater than the specified range, test the signal circuit short to ground.

5. Test for less than 1 ohm of resistance between the low reference circuit terminal 2 and the

SDM connector terminal listed below:

If DTC B0100 is set, SDM terminal 26

If DTC B0103 is set, SDM terminal 27

If greater than the specified range, test the low reference circuit for an open/high
resistance.

6. Connect the SDM and EFS connectors.

7. Verify that DTC B0100 or B0103 are not set.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

If DTC B0100 is set replace the left EFS. If the DTC resets, replace the SDM.

If DTC B0103 is set replace the right EFS. If the DTC resets, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inflatable Restraint Front End Sensor Replacement

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup and programming

DTC B1001

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 B1001

SDM Option Configuration Error

Circuit/System Description

When the ignition is first turned ON, the inflatable restraint sensing and diagnostic module
(SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the body
control module (BCM). The restraints ID being compared contains the last four digits of the
SDM part number. The SDM then compares the vehicle identification number (VIN) stored in
the SDM to the VIN stored in the BCM.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The restraints ID stored in the SDM does not match the restraints ID stored in the BCM or the
VIN information stored in the SDM does not match the VIN information stored in the BCM.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Action Taken When the DTC Sets

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

The SDM disables all AIR BAG deployments.

Conditions for Clearing the DTC

You issue a scan tool CLEAR DTCs command.

The restraints ID that is stored in the SDM matches the restraints ID that is stored in the
BCM.

Diagnostic Aids

DTC B1001 is an indication that the restraint IDs stored in both the BCM and SDM do not match
or that the VINs stored in both the BCM and SDM do not match. If the BCM was replaced, the
replacement module will have to be reprogrammed for proper operation.

Reference Information

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Circuit/System Testing

1. Ignition ON, use the scan tool to request SIR DTCs. Verify that DTC B1001 is set as

current.

If DTC B1001 is history, clear codes and recheck.

2. Using the scan tool check the BCM that is programmed with the VIN. Verify that the BCM

is programmed with the correct VIN number with the vehicle VIN plate.

If the BCM has the wrong VIN number, refer to BCM in Repair Instructions for
programming.

3. Using the scan tool perform the Setup SDM Part Number into BCM procedure.

4. Ignition ON use the scan tool to clear the DTCs. Verify that DTC B1001 is cleared.

If DTC B1001 was current replace the SDM.

Repair Procedures

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3