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Home >> Hummer >> 2009 >> H3 L5-3.7L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0068

B0068




DTC B0061, B0062, or B0068

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC B0061
- Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Resistance Low

DTC B0062
- 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





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:

* 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* 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.
* A history DTC will clear once 100 malfunction - free ignition cycles have occurred.

Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

SIR System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

* J 38715-A SIR Driver/Passenger Load Tool
* J 38715-50 Load Tool Adapter

Circuit/System Testing

Important: Refer to SIR Service Precautions (Technician Safety Information).


When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:


* Inflatable restraint module

* SDM module

* Front end sensor wiring harness connector

* SDM wiring harness connector


Important: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shoring-bars within the connector allowing the deployment circuit to operate properly.


1. Verify that the LF inflatable restraint side impact module connector and CPA are engaged.

• If the above condition is not found, make the appropriate repair.

2. Ignition OFF, disconnect the harness connector at the left roof rail inflatable restraint module.
3. With the appropriate load tool adapter, connect J 38715-A in place of the left roof rail inflatable restraint module.
4. Ignition ON, with a scan tool, verify that the appropriate DTC is set as current.

• If the DTC is not set or is set as history, cycle the ignition OFF, disconnect the load tool and adapter, reconnect the harness connector at the left roof rail inflatable restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the left roof rail inflatable restraint module.

5. Ignition OFF, disconnect the load tool and the adapter.
6. Disconnect the harness connector at the SDM.
7. Ignition ON, test for less than 1.0 volt between the low control circuit terminal 12 and ground.

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

8. Ignition ON, test for less than 1.0 volt between the high control circuit terminal 13 and ground.

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

9. Ignition OFF, test for infinite resistance between the low control circuit terminal 12 and ground.

• If less than the specified value, test the control circuit for a short to ground.

10. Ignition OFF, test for infinite resistance between the high control circuit terminal 13 and ground.

• If less than the specified value, test the control circuit for a short to ground.

11. Test for less than 1.0 ohm between the low control circuit terminal 4 and the SDM terminal 12.

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

12. Test for less than 1.0 ohm between the high control circuit terminal 3 and the SDM terminal 13.

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

13. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Inflatable Restraint Roof Side Rail Module Replacement - Front (Service and Repair)
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming

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