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 B0022: Driver Frontal Deployment Loop (Stage 1) Resistance LowDTC B0024: Driver Frontal Deployment Loop (Stage 1) Voltage Out of Range
DTC B0026: Driver Frontal Deployment Loop (Stage 1) Open
DTC B0042: Driver Frontal Deployment Loop (Stage 2) Resistance Low
DTC B0043: Driver Frontal Deployment Loop (Stage 2) Voltage Out of Range
DTC B0044: Driver Frontal Deployment Loop (Stage 2) Open
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Steering Wheel Module Stage 1 High Circuit | B0024 | B0024 | B0026 | B0024 | B0022 |
Steering Wheel Module Stage 1 Low Circuit | B0024 | B0024 | B0026 | B0024 | B0022 |
Steering Wheel Module Stage 2 High Circuit | B0043 | B0043 | B0044 | B0043 | B0042 |
Steering Wheel Module Stage 2 Low Circuit | B0043 | B0043 | B0044 | B0043 | B0042 |
Circuit/System Description
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 steering module module. The SDM 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 connector which will short together both steering wheel module stage 1 high and low circuits, and both steering wheel module stage 2 high and low circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module 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 steering wheel module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0024 stage 1 or B0043 stage 2
| • | The steering wheel module stage 1 or stage 2 high and/or low circuits is short to ground or short to voltage for 500 milliseconds. |
| • | The steering wheel module stage 1 or stage 2 high circuit is less than 2.4 volts and steering wheel module stage 1 or stage 2 deployment loop resistance is less than 6 ohms for 500 milliseconds. |
B0026 stage 1 or B0044 stage 2
| • | The steering wheel module stage 1 or stage 2 high circuit is less than 2.4 volts and the steering wheel module stage 1 or stage 2 deployment loop is more than 6 ohms for 500 milliseconds. |
| • | The steering wheel module stage 1 or stage 2 deployment loop resistance is greater than 4.8 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The SDM commands the AIR BAG indicator ON via serial data communications. |
| • | 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 DTCs 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.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Special Tools Required
| • | J 38715-A SIR Driver/Passenger Load tool |
| • | J 38715-80 SIR Load Tool Adapter (Bottom of Column) |
| • | J 38715-120 SIR Load Tool Adapter (Top of Column) |
Circuit/System Testing
- Ignition OFF, disconnect the steering wheel module. Then use J 38715-120 to connect the J 38715-A to the upper steering wheel coil module in-line wiring harness connectors. Use the PASSENGER INFLATOR and STEERING COLUMN connectors located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0022, B0024, B0026, B0042, B0043 or B0044 are set current.
- Ignition OFF, disconnect steering wheel module coil in-line connector.
- Use J 38715-80 to connect the J 38715-A to the harness side of the steering wheel module coil in-line wiring harness connector. Use the PASSENGER INFLATOR and BASE of COLUMN connectors located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0022, B0024, B0026, B0042, B0043 or B0044 are set current.
- Ignition OFF, disconnect and remove the J 38715-A and adapter.
- Disconnect the SDM harness connector.
- Test the high and low circuits between the SDM and steering wheel module coil for a short to voltage, short to ground, an open, or low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.
- If all circuits test normal then replace the SDM.
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• The steering wheel module coil • The steering wheel module • The SDM module • The steering wheel coil module wiring harness connector • The steering wheel module wiring harness connector • The SDM wiring harness connector
| ⇒ | If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is history replace the steering wheel module. |
| ⇒ | If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is history replace the steering wheel module coil. |
| ⇒ | If any of the above conditions are found make the appropriate repair. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
