B0012
DTC B0012 or B0013
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
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/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
* 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 deployment.
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
SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
SIR System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Special Tools
* J 38715-A SIR Driver/Passenger Load Tool
* J38715-80 Driver/Passenger Load Tool Adapter
* EL38715-120 SIR Load Tool Adapter (Top of Column)
* EL38715-140 SIR Load Tool Adapter (Back of Steering Wheel Coil)
Circuit/System Testing
Important: 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
Important: 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.
1. Verify that the appropriate steering wheel module connector and the CPA are engaged.
• If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the appropriate harness connector at the steering wheel module.
3. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the steering wheel module.
4. Ignition ON, verify DTC is set as current.
• If the DTC is not set or is set as history, cycle ignition OFF, disconnect the load tool and adaptor, reconnect the harness connector at the steering wheel module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the steering wheel module.
5. Ignition OFF, disconnect the load tool and adaptor.
6. Disconnect the X1 harness connector at the steering wheel module coil.
7. With the appropriate load tool adapter, connect special tool J 38715-A in place of the steering wheel module coil.
8. Ignition ON, verify DTC is set as current.
• If the DTC is not set or is set as history, replace the steering wheel module coil.
9. Ignition OFF, disconnect the load tool and the adaptor.
10. Ignition ON, test for less than 1-volt between the appropriate high control circuit listed below and ground:
* Stage 1 terminal 2 X1 harness connector at the steering wheel module coil
* Stage 2 terminal 4 X1 harness connector at the steering wheel module coil
• If not the specified range, test the high control circuit for a short to voltage.
11. Test for less than 1-volt between the appropriate low control circuit listed below and ground:
* Stage 1 terminal 1 X1 harness connector at the steering wheel module coil
* Stage 2 terminal 3 X1 harness connector at the steering wheel module coil
• If not the specified range, test the low control circuit for a short to voltage.
12. Ignition OFF, test for infinite resistance between the appropriate high circuit listed below and ground:
* Stage 1 terminal 2 X1 harness connector at the steering wheel module coil
* Stage 2 terminal 4 X1 harness connector at the steering wheel module coil
• If not the specified range, test the high control circuit for a short to ground.
13. Test for infinite resistance between the appropriate low control circuit listed below and ground:
* Stage 1 terminal 1 X1 harness connector at the steering wheel module coil
* Stage 2 terminal 3 X1 harness connector at the steering wheel module coil
• If not the specified range, test the low control circuit for a short to ground.
14. Disconnect the harness connector at the SDM.
15. Test for less then 1 ohm between the appropriate high control circuit terminals listed:
* Stage 1 steering wheel module coil terminal 2 X1 and SDM terminal 14
* Stage 2 steering wheel module coil terminal 4 X1 and SDM terminal 17
• If not the specified range, test the high control circuit for an open/high resistance.
16. Test for less then 1 ohm between the appropriate low control circuit terminals listed:
* Stage 1 steering wheel module coil terminal 1 X1 and SDM terminal 15
* Stage 2 steering wheel module coil terminal 3 X1 and SDM terminal 16
• If not the specified range, test the low control circuit for an open/high resistance.
17. If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Inflatable Restraint Module Coil Replacement (Removal and Replacement)
* Steering Wheel Inflatable Restraint Module Replacement (Service and Repair)
* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming