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 Control | B0024 | B0024 | B0026 | B0024 | B0022 |
Steering Wheel Module Stage 1 Low Control | B0024 | B0024 | B0026 | B0024 | B0022 |
Steering Wheel Module Stage 2 High Control | B0043 | B0043 | B0044 | B0043 | B0042 |
Steering Wheel Module Stage 2 Low Control | 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 shorted to ground or shorted 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator ON. |
| • | The SIR system is disabled and no deployments are allowed. |
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. |
Diagnostic Aids
If there is more than one DTC set diagnose the open DTC first.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 38715-A Driver and Passenger SIR Load Tool
Circuit/System Testing
Important: When removing the connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
• Steering wheel module coil • Steering wheel module • SDM module • Steering wheel coil module wiring harness connector • Steering wheel module wiring harness connector • SDM wiring harness connector
- Verify that the steering wheel module connector and the CPA are engaged.
- 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 in place of the wheel module.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0022, B0024, B0026, B0042, B0043 or B0044 are set as current.
- Ignition OFF, disconnect the 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.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0022, B0024, B0026, B0042, B0043 or B0044 are set as current.
- Ignition OFF, disconnect and remove the J 38715-A and adapter.
- Disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:
- Test for less than 1 volt between the appropriate low control circuit listed below and ground:
- Ignition OFF, test for infinite resistance between the appropriate high control circuit listed below and ground:
- Test for infinite resistance between the appropriate low control circuit listed below and ground:
- Test for less than 1 ohm between the appropriate high control circuit terminals listed below:
- Test for less than 1 ohm between the appropriate low control circuit terminals listed below:
- If all circuits test normal, replace the SDM.
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 shorting-bars within the connector allowing the deployment circuit to operate properly.
| ⇒ | If the above condition is not found, make the appropriate repair. |
| ⇒ | If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is not set or is set as history, cycle the ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the steering wheel module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the steering wheel module. |
| ⇒ | If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is history replace the steering wheel module coil. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A1 |
| • | Steering wheel module coil in-line connector Stage 2 terminal B1 |
| ⇒ | If greater than the specified range, test the circuit for a short to voltage. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A2 |
| • | Steering wheel module coil in-line connector Stage 2 terminal B2 |
| ⇒ | If greater than the specified range, test the circuit for a short to voltage. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A1 |
| • | Steering wheel module coil in-line connector Stage 2 terminal B1 |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A2 |
| • | Steering wheel module coil harness connector Stage 2 terminal B2 |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A1 and SDM terminal A1 |
| • | Steering wheel module coil in-line connector Stage 2 terminal B1 and SDM terminal B1 |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
| • | Steering wheel module coil in-line connector Stage 1 terminal A2 and SDM terminal A2 |
| • | Steering wheel module coil in-line connector Stage 2 terminal B2 and SDM terminal B2 |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
