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 : Passenger Frontal Deployment Loop (Stage 2) Resistance LowDTC B0013 : Passenger Frontal Deployment Loop (Stage 2) Open
DTC B0014 : Passenger Frontal Deployment Loop (Stage 2) Voltage Out of Range
DTC B0016 : Passenger Frontal Deployment Loop (Stage 1) Resistance Low
DTC B0017 : Passenger Frontal Deployment Loop (Stage 1) Open
DTC B0018 : Passenger Frontal Deployment Loop (Stage 1) Voltage Out of Range
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
I/P Module Stage 1 High Circuit | B0018 | B0018 | B0017 | B0018 | B0016 |
I/P Module Stage 1 Low Circuit | B0018 | B0018 | B0017 | B0018 | B0016 |
I/P Module Stage 2 High Circuit | B0014 | B0014 | B0013 | B0014 | B0012 |
I/P Module Stage 2 Low Circuit | B0014 | B0014 | B0013 | B0014 | B0012 |
Circuit/System Description
During a side or 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 instrument panel (I/P) 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 I/P module connector which will short together both I/P module stage 1 high and low circuits, and both I/P module stage 2 high and low circuits, 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 Stage 2 or B0016 Stage 1
The I/P module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
B0013 Stage 2 or B0017 Stage 1
| • | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and the I/P module stage 1 or stage 2 deployment loop is more than 6 ohms for 500 milliseconds. |
| • | The I/P module stage 1 or stage 2 deployment loop resistance is more than 4.8 ohms for 500 milliseconds. |
B0014 Stage 2 or B0018 Stage 1
| • | The I/P module stage 1 or stage 2 high and/or low circuits is short to ground or short to voltage for 500 milliseconds. |
| • | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and I/P module stage 1 or stage 2 deployment loop resistance is less than 6 ohms for 500 milliseconds. |
Action Taken When the DTC Sets
| • | The SDM commands the AIR BAG indicator ON via serial data communications. |
| • | The SIR System is disabled and no deployments are allowed. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
| • | A history DTC will clear once 255 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
If there is more than one DTC set diagnose the open DTC first.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Special Tools Required
| • | J 38715-A SIR Driver/Passenger Load tool |
| • | J 38715-80 Load Tool Adapter |
Circuit/System Testing
- Ignition OFF, disconnect I/P module in-line connector.
- Use J 38715-80 to connect the J 38715-A to the harness side of the I/P module in-line wiring harness connector. Use the PASSENGER INFLATOR and BASE of COLUMN connectors located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012, B0013, B0014, B0016, B0017, or B0018 is current.
- Ignition OFF, disconnect and remove the J 38715-A and adapter.
- Disconnect the SDM harness connector.
- Test the high and low circuits between the SDM and I/P 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 all circuits test normal then replace the SDM.
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 I/P module • The SDM module • The I/P wiring harness connector • The SDM wiring harness connector
| ⇒ | If DTC B0012, B0013, B0014, B0016, B0017, or B0018 is history replace the I/P module. |
| ⇒ | If any of the above conditions are found make the appropriate repair. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
