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

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

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Side Impact Module - Driver - Low Control	B0012 02	B0012 04	B0012 0D	B0012 01	B0012 0E
Side Impact Module - Driver - High Control	B0012 02	B0012 04	B0012 0D	B0012 01	B0012 0E
Seat Belt Pretensioner - Driver Low Control	B0013 02	B0013 04	B0013 0D	B0013 01	B0013 0E
Seat Belt Pretensioner - Driver - High Control	B0013 02	B0013 04	B0013 0D	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

Diagnostic Aids

When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

Scan Tool Reference

Special Tools Required

J 38715-A SIR Driver/Passenger Load Tool

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 the steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. With the applicable adaptor, connect J 38715-A .
3. Ignition ON, with a scan tool, verify DTC is set as current.

⇒	If DTC is not set or is set as history, replace the steering wheel module.

4. Ignition OFF, disconnect J 38715-A .
5. Disconnect the steering wheel module coil in-line connector. Refer to Inflatable Restraint Steering Wheel Module Coil Centering .
6. With the applicable adaptor, connect J 38715-A .
7. Ignition ON, with a scan tool, verify DTC is set as current.

⇒	If DTC is not set or is set as history, replace the steering wheel module coil.

8. Ignition OFF, disconnect J 38715-A and the applicable adaptor.
9. Ignition ON, test for less than 1-volt between the applicable HI circuit and ground.

⇒	If not the specified range, test the circuit for a short to voltage.

10. Test for less than 1-volt between the applicable LOW circuit and ground.

⇒	If not the specified range, test the circuit for a short to voltage.

11. Ignition OFF, test for infinite resistance between the applicable HI circuit and ground.

⇒	If not the specified range, test the circuit for a short to ground.

12. Test for infinite resistance between the applicable LOW circuit and ground.

⇒	If not the specified range, test the circuit for a short to ground.

13. Disconnect the harness connector at the SDM.
14. Test for less then 1 ohm of resistance between the SDM connector and the airbag module connector HI circuit.

⇒	If not the specified range, test the circuit for an open/high resistance.

15. Test for less then 1 ohm of resistance between the SDM connector and the airbag module connector LOW circuit.

⇒	If not the specified range, test the circuit for an open/high resistance.

16. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.