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
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
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 |
|---|---|---|---|---|---|
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 V.
Conditions for Setting the DTC
B0012 01 stage 1 or B0013 01 stage 2
The steering wheel module high and/or low control circuit is shorted to voltage for 2 seconds.
B0012 02 stage 1 or B0013 02 stage 2
The steering wheel module high and/or low control circuit is shorted to ground for 2 seconds.
B0012 04 stage 1 or B0013 04 stage 2
The steering wheel module high and/or low control circuit is open for 2 seconds.
B0012 0D stage 1 or B0013 0D stage 2
The steering wheel module deployment loop resistance is more than 5.5 Ω for 2 seconds.
B0012 0E stage 1 or B0013 0E stage 2
The steering wheel module deployment loop resistance is less than 1.7 Ω for 2 seconds.
Action Taken When the DTC Sets
| • | The SDM requests the instrument panel cluster to illuminate the AIR BAG indicator. |
| • | The SDM will store a DTC, however if an event occurs the system will still attempt deployment. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is 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
Circuit/System Testing
Note: Refer to SIR Service Precautions.
When removing connectors inspect for damage or corrosion. Damage or corrosion in 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. |
- Ignition OFF, disconnect the appropriate steering wheel module harness connector at the F107 steering wheel module.
- Ignition ON, verify that the scan tool Deployment Loop Resistance parameter is infinite resistance at the control circuits.
- Connect a fused jumper wire between the control circuit terminals listed below:
- Ignition ON, verify that the scan tool Deployment Loop Resistance parameter is less than 1.8 Ω at the control circuits.
- If all circuits test normal, replace the F107 steering wheel module.
Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
| ⇒ | If less than the specified value, test the control circuits for a short to ground. If the circuits test normal, replace the K36 SDM. |
| • | F107 steering wheel module stage 1 terminal 1 and terminal 2 |
| • | F107 steering wheel module stage 2 terminal 1 and terminal 2 |
| ⇒ | If greater than the specified range, test the control circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the K36 SDM |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
