B0044
DTC B0022, B0024, B0026, B0042, B0043, or B0044
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 B0022
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Resistance Low
DTC B0024
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Voltage Out of Range
DTC B0026
- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Open
DTC B0042
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Resistance Low
DTC B0043
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Voltage Out of Range
DTC B0044
- Driver Steering Wheel Air Bag Deployment Loop Stage 2 Open
Diagnostic Fault Information
Circuit/System Description
During a frontal crash of sufficient force the Inflatable Restraint Sensing and Diagnostic Module will allow current to flow through the deployment loop in order to deploy the driver steering wheel air bag. The Inflatable Restraint Sensing and Diagnostic Module performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. There are 2 shorting bars used within the steering wheel module coil connector which will short together both driver steering wheel air bag stage 1 high circuit and driver steering wheel air bag stage 1 low circuit and both driver steering wheel air bag stage 2 high circuit and driver steering wheel air bag stage 2 low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0022 stage 1 or B0042 stage 2
The driver steering wheel air bag deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0024 stage 1 or B0043 stage 2
* The driver steering wheel air bag stage 1 or stage 2 high circuit is less than 2.4 volts and the driver steering wheel air bag stage 1 or stage 2 deployment loop is greater than 6 ohms for 500 milliseconds.
* The driver steering wheel air bag stage 1 or stage 2 deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.
B0026 stage 1 or B0044 stage 2
* The driver steering wheel air bag stage 1 or stage 2 high and/or low circuits is shorted to ground or shorted to voltage for 500 milliseconds.
* The driver steering wheel air bag stage 1 or stage 2 high circuit is less than 2.4 volts and driver steering wheel air bag stage 1 or stage 2 deployment loop resistance is less than 6 ohms for 500 milliseconds.
Action Taken When the DTC Sets
* The Inflatable Restraint Sensing and Diagnostic Module requests the Instrument Cluster to illuminate the AIR BAG indicator.
* The Inflatable Restraint Sensing and Diagnostic Module will store a DTC, however if an event occurs the system will still attempt deployments.
Conditions for Clearing the DTC
* The condition 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 5 Bow Lowered Switch (CM7)
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
J 38715-A Driver and Passenger SIR Load Tool
EL-38125-580 Terminal Release Tool Kit
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:
* Driver steering wheel air bag
* Inflatable Restraint Sensing and Diagnostic Module
* Driver steering wheel air bag wiring harness connector
* Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
Note: 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 shorting-bars within the connector allowing the deployment circuit to operate properly.
1. Verify that the driver steering wheel air bag connector and the CPA are engaged.
• If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the harness connector at the driver steering wheel air bag.
3. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the driver steering wheel air bag.
4. Ignition ON, verify DTC is set as current.
• If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the driver steering wheel air bag, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the driver steering wheel air bag.
5. Ignition OFF, disconnect special tool J 38715-A and adaptor.
6. Disconnect the in-line harness connector at the steering wheel module coil.
7. With the appropriate load tool adaptor, connect special tool J 38715-A.
8. Ignition ON, with a scan tool, verify DTC is set as current.
• If DTC is not set or is set as history, replace the steering wheel module coil.
9. Ignition OFF, disconnect special tool J 38715-A and adaptor.
10. Disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module.
11. Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:
* Steering wheel module coil connector stage 1 terminal A1 X275
* Steering wheel module coil connector stage 2 terminal B1 X275
• If greater than the specified range, test the circuit for a short to voltage.
12. Test for less than 1 volt between the appropriate low control circuit listed below and ground:
* Steering wheel module coil connector stage 1 terminal A2 X275
* Steering wheel module coil connector stage 2 terminal B2 X275
• If greater than the specified range, test the circuit for a short to voltage.
13. Ignition OFF, test for infinite resistance between the appropriate high control circuit listed below and ground:
* Steering wheel module coil connector stage 1 terminal A1 X275
* Steering wheel module coil connector stage 2 terminal B1 X275
• If less than the specified value, test the circuit for a short to ground.
14. Test for infinite resistance between the appropriate low control circuit listed below and ground:
* Steering wheel module coil connector stage 1 terminal A2 X275
* Steering wheel module coil connector stage 2 terminal B2 X275
• If less than the specified value, test the circuit for a short to ground.
15. Test for less than 1 ohm between the appropriate high control circuit terminals listed below:
* Steering wheel module coil connector stage 1 terminal A1 X275 and Inflatable Restraint Sensing and Diagnostic Module terminal 13
* Steering wheel module coil connector stage 2 terminal B1 X275 and Inflatable Restraint Sensing and Diagnostic Module terminal 34
• If greater than the specified range, test the circuit for an open/high resistance.
16. Test for less than 1 ohm between the appropriate low control circuit terminals listed below:
* Steering wheel module coil connector stage 1 terminal A2 X275 and Inflatable Restraint Sensing and Diagnostic Module terminal 12
* Steering wheel module coil connector stage 2 terminal B2 X275 and Inflatable Restraint Sensing and Diagnostic Module terminal 33
• If greater than the specified range, test the circuit for an open/high resistance.
17. Test for infinite resistance between the appropriate control circuit terminals listed below:
Note: Some connectors may be equipped with shorting bars as a safety component to prevent accidental deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.
* Steering wheel module coil connector stage 1 terminal A1 X275 and Steering wheel module coil connector stage 1 terminal A2 X275
* Steering wheel module coil connector stage 2 terminal B1 X275 and Steering wheel module coil connector stage 2 terminal B2 X275
• If greater than the specified range, test the circuit for an open/high resistance.
18. If all circuits test normal, replace the Inflatable Restraint Sensing and Diagnostic Module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Steering Wheel Inflatable Restraint Module Replacement Steering Wheel Inflatable Restraint Module Replacement
* Inflatable Restraint Steering Wheel Module Coil Centering Procedures
* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, setup, and programming