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

DTC B0013 01 : Driver Frontal Deployment Loop Stage 2 Short to Battery

DTC B0013 02 : Driver Frontal Deployment Loop Stage 2 Short to Ground

DTC B0013 04 : Driver Frontal Deployment Loop Stage 2 Open Circuit

DTC B0013 0D : Driver Frontal Deployment Loop Stage 2 Resistance Above Threshold

DTC B0013 0E : Driver Frontal Deployment Loop Stage 2 Resistance Below Threshold

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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
Steering Wheel Module Stage 2 High Circuit	B0013 02	B0013 0D	B0013 04	B0013 01	B0013 0E
Steering Wheel Module Stage 2 Low Circuit	B0013 02	B0013 0D	B0013 04	B0013 01	B0013 0E

Circuit/System Description

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. There are 2 shorting bars used within the steering wheel module coil connector which will short together both steering wheel module stage 1 high circuit and steering wheel module stage 1 low circuit and both steering wheel module stage 2 high circuit and steering wheel module stage 2 low circuit 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

B0012 01 Stage 1 or B0013 01 Stage 2

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

B0012 02 Stage 1 or B0013 02 Stage 2

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

B0012 04 Stage 1 or B0013 04 Stage 2

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

B0012 0D Stage 1 or B0013 0D Stage 2

The steering wheel module deployment loop resistance is more than 5.1 ohms for 120 milliseconds.

B0012 0E Stage 1 or B0013 0E Stage 2

The steering wheel module deployment loop resistance is less than 1.3 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

SIR Connector End Views

Electrical Information Reference

Special Tools Required

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. Then use J 38715-120 adapter 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.
2. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC  B0012 or B0013 are set current.

⇒	If DTC B0012 or B0013 is history replace the steering wheel module.

3. Ignition OFF, remove the left instrument panel (I/P) outer trim cover and disconnect steering wheel coil module in-line connector. Refer to Instrument Panel Outer Trim Cover Replacement - Left Side .
4. Use J 38715-80 adapter to connect the J 38715-A to the harness side of the steering wheel coil module in-line wiring harness connector. Use the PASSENGER INFLATOR and BASE of COLUMN connectors located on the load tool.
5. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012 or B0013 are set current.

⇒	If DTC B0012 or B0013 is history replace the steering wheel coil module.

6. Ignition OFF, disconnect and remove the J 38715-A and adapter. Then remove the SDM connector. Refer to SDM replacement in Repair Instructions for connector location.
7. Test the high and low circuits between the SDM and steering wheel coil module 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 any of the above conditions are found make the appropriate repair.

8. If all circuits test normal then replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.