Diagnostic Instructions

DTC Descriptors

DTC B0012 01 : Driver Frontal Deployment Loop Stage 1 Short to Battery

DTC B0012 02 : Driver Frontal Deployment Loop Stage 1 Short to Ground

DTC B0012 04 : Driver Frontal Deployment Loop Stage 1 Open Circuit

DTC B0012 0D : Driver Frontal Deployment Loop Stage 1 Resistance Above Threshold

DTC B0012 0E : Driver Frontal Deployment Loop Stage 1 Resistance Below Threshold

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Steering Wheel Module Stage 1 High Circuit	B0012 02	B0012 0D	B0012 04	B0012 01	B0012 0E
Steering Wheel Module Stage 1 Low Circuit	B0012 02	B0012 0D	B0012 04	B0012 01	B0012 0E

Circuit/System Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.

Upon passing these tests, ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops. The SDM checks the wiring connection to the driver frontal deployment loop by letting the infinitesimal current flow through internal circuit and verify the resistance.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0012 01 Stage 1

The steering wheel module high and/or low circuit is short to voltage for 120 milliseconds.

B0012 02 Stage 1

The steering wheel module high and/or low circuit is short to ground for 120 milliseconds.

B0012 04 Stage 1

The steering wheel module high and/or low circuit is open for 120 milliseconds.

B0012 0D Stage 1

The steering wheel module deployment loop resistance is more than 4.24 ohms for 120 milliseconds.

B0012 0E Stage 1

The steering wheel module deployment loop resistance is less than 2.01 ohms for 120 milliseconds.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Circuit/System Testing

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 coil module

•	The SDM module

•	The steering wheel coil module wiring harness connector

•	The SDM wiring harness connector

1. Ignition OFF, disconnect steering wheel module and steering wheel module coil connector.
2. Test the high and low circuits between the steering wheel module coil connector and the steering wheel module connector for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.

⇒	If any of the above conditions are replace the steering wheel module coil.

3. Ignition OFF, disconnect the SDM connector.
4. Test the high and low circuits between the SDM and steering wheel module coil connector for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.

⇒	If any of the above conditions are found make the appropriate repair.

5. If all circuits test normal then replace the SDM. Refer to SDM replacement in Repair Instructions for connector location.
6. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012 is set as history.

⇒	If DTC B0012 is current replace the steering wheel module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.