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Home >> Hummer >> 2010 >> H3 L5-3.7L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0071

B0071




DTC B0069, B0070, or B0071

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 B0069
- Right Front Roof Rail Bag Deployment Loop Resistance Low

DTC B0070
- Right Front Roof Rail Bag Deployment Loop Open

DTC B0071
- Right Front Roof Rail 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 - right 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 V.

Conditions for Setting the DTC

B0069

DTC B0069 will set when the roof rail module-right deployment loop resistance is less than 1.3 ohm 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 V 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 ohm 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 V and roof rail module - right deployment loop resistance is less than 6 ohm 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 End Views By Name)
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
* EL 38715-125 Load Tool Adapter

Circuit/System Testing

Note:
* 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

* 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 right front 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 right roof rail inflatable restraint module.
3. With the appropriate load tool adapter, connect J 38715-A in place of the right 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 right roof rail inflatable restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the right 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 V between the low control circuit terminal 15 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 V between the high control circuit terminal 14 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 15 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 14 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 15.

• 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 14.

• 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 (H3) (Inflatable Restraint Roof Side Rail Module Replacement - Front (H3))
* 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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