Diagnostic Instructions

DTC Descriptors

DTC B0022 : Driver Frontal Deployment Loop Resistance Low

DTC B0024 : Driver Frontal Deployment Loop Voltage Out of Range

DTC B0026 : Driver Frontal Deployment Loop Open

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Steering Wheel Module High Circuit	B0024	B0024	B0026	B0024	B0022
Steering Wheel Module Low Circuit	B0024	B0024	B0026	B0024	B0022

Circuit/System Description

The driver deployment loop consists of a inflatable restraint steering wheel module, the inflatable restraint steering wheel module coil, steering wheel module high and steering wheel module low circuits. There is a shorting bar used within the steering wheel module coil connector which will short together both steering wheel module high circuit and steering wheel module low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. During a 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 wheel 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 DTC will be stored in memory.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0022

DTC B0022 will set when the steering wheel module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

B0024

DTC B0024 will set when one of the following conditions occur:

B0026

DTC B0026 will set when one of the following conditions occurs:

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

If there is more than one DTC set diagnose the open DTC first. The following conditions are possible causes of the malfunction:

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

Special Tools Required

Circuit/System Testing

1. With the ignition OFF, disconnect the steering wheel module coil in-line connector located at the base of column.
2. Inspect the component and wiring harness sides of the in-line connector for damage or corrosion.

⇒	If the in-line connector for the steering wheel module coil is damaged, the steering wheel module coil must be replaced.

⇒	If the steering wheel module coil wiring harness side connector is damaged, replace the harness side of the connector.

3. Use J 38715-100 adapter to connect the J 38715-A to the harness side of the steering wheel module coil in-line wiring harness connector. Use the BASE of COLUMN connector located on the load tool.
4. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0022, B0024, or B0026 are set as current or in history.
5. With the ignition OFF, disconnect and remove the J 38715-A and adapter.
6. If DTC B0022, B0024, or B0026 is history reconnect the steering wheel module coil wiring harness. Use J 38715-30A adapter to connect the J 38715-A to the harness side of the steering wheel module connector. If DTC B0022, B0024, or B0026 is set as current, replace the steering wheel module coil. If DTC B0022, B0024, or B0026 are set in history, replace the steering wheel module.
7. If DTC B0022, B0024, or B0026 is current a problem exists with the SDM and or the wiring harness. Remove the SDM connector. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the steering wheel module coil high and/or low circuits.

⇒	If damage or corrosion is found make the appropriate repair.

8. Test the high and low circuits between the SDM and steering wheel module coil for a short to voltage, short to ground, or open/low resistance.

⇒	If circuits test good then replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.