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 B0012 01: Driver Frontal Deployment Loop Stage 1 Short to BatteryDTC 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 | Low Resistance | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|---|
Steering Wheel Module Stage 1 High Control | B0012 02 | B0012 0E | B0012 0D | B0012 04 | B0012 01 |
Steering Wheel Module Stage 1 Low Control | B0012 02 | B0012 0E | B0012 0D | B0012 04 | B0012 01 |
Steering Wheel Module Stage 2 High Control | B0013 02 | B0013 0E | B0013 0D | B0013 04 | B0013 01 |
Steering Wheel Module Stage 2 Low Control | B0013 02 | B0013 0E | B0013 0D | B0013 04 | B0013 01 |
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 shorted to voltage for 120 milliseconds.
B0012 02 Stage 1 or B0013 02 Stage 2
The steering wheel module high and/or low circuit is shorted 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 greater 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
| • | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
| • | The SDM will store a DTC, however if an event occurs the system will still attempt deployments. |
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. |
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 SIR Driver/Passenger Load Tool
Circuit/System Testing
- Verify that the steering wheel inflator restraint module connector and CPA are engaged.
- Ignition OFF, disconnect the harness connector at the steering wheel inflator module.
- With the appropriate load tool adaptor, connect J 38715-A or SA9409Z-A in place of the steering wheel inflator module.
- Ignition ON, with a scan tool, verify the appropriate DTC is set as current.
- Ignition OFF, disconnect the load tool and the adaptor.
- Disconnect the steering wheel module coil in-line harness connector X275.
- With the appropriate load tool adaptor, connect special tool J 38715-A in place of the steering wheel module.
- Ignition ON, with a scan tool, verify DTC is set as current.
- Ignition OFF, disconnect load tool and the adaptor.
- 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 then 1 ohm between the following high control circuit terminals listed below:
- Test for less then 1 ohm between the following low control circuit terminals listed below:
- If all circuits test normal, replace the SDM.
Important: Refer to SIR Service Precautions.
When removing the connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:| • | Pretensioner |
| • | Air bag module |
| • | SDM module |
| • | Air bag wiring harness connector |
| • | SDM wiring harness connector |
| ⇒ | If the above condition is not found, make the appropriate repair. |
| ⇒ | If the DTC is not set or is set as history, cycle ignition OFF, disconnect the load tool and adapter, reconnect the harness connector at the steering wheel inflator module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the steering wheel inflator module. |
| ⇒ | If DTC is not set or is set as history, replace the steering wheel module coil. |
| • | Stage 1 steering wheel module coil connector terminal 2 X275 |
| • | Stage 2 steering wheel module coil connector terminal 4 X275 |
| ⇒ | If not the specified range, test the high control circuit for a short to voltage. |
| • | Stage 1 steering wheel module coil connector terminal 1 X275 |
| • | Stage 2 steering wheel module coil connector terminal 3 X275 |
| ⇒ | If not the specified range, test the low control circuit for a short to voltage. |
| • | Stage 1 steering wheel module coil connector terminal 2 X275 |
| • | Stage 2 steering wheel module coil connector terminal 4 X275 |
| ⇒ | If not the specified range, test the high control circuit for a short to ground. |
| • | Stage 1 steering wheel module coil connector terminal 1 X275 |
| • | Stage 2 steering wheel module coil connector terminal 3 X275 |
| ⇒ | If not the specified range, test the low control circuit for a short to ground. |
| • | Stage 1 steering wheel module coil connector terminal 2 X275 and SDM terminal 9 |
| • | Stage 2 steering wheel module coil connector terminal 4 X275 and SDM terminal 5 |
| ⇒ | If not the specified range, test the high control circuit for an open/high resistance. |
| • | Stage 1 steering wheel module coil connector terminal 1 X275 and SDM terminal 8 |
| • | Stage 2 steering wheel module coil connector terminal 3 X275 and SDM terminal 4 |
| ⇒ | If not the specified range, test the low control 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 |
