B0019
DTC B0019 or B0020
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptors
DTC B0019 01
- Passenger Frontal Deployment Loop Stage 1 Short to Battery
DTC B0019 02
- Passenger Frontal Deployment Loop Stage 1 Short to Ground
DTC B0019 04
- Passenger Frontal Deployment Loop Stage 1 Open Circuit
DTC B0019 0D
- Passenger Frontal Deployment Loop Stage 1 Resistance Above Threshold
DTC B0019 0E
- Passenger Frontal Deployment Loop Stage 1 Resistance Below Threshold
DTC B0020 01
- Passenger Frontal Deployment Loop Stage 2 Short to Battery
DTC B0020 02
- Passenger Frontal Deployment Loop Stage 2 Short to Ground
DTC B0020 04
- Passenger Frontal Deployment Loop Stage 2 Open Circuit
DTC B0020 0D
- Passenger Frontal Deployment Loop Stage 2 Resistance Above Threshold
DTC B0020 0E
- Passenger Frontal Deployment Loop Stage 2 Resistance Below Threshold
Diagnostic Fault Information
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 an inflatable restraint module. There are 2 shorting bars used within the module connector which will short together both 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
B0019 01 Stage 1 or B0020 01 Stage 2
The I/P module high and/or low circuit is short to voltage for 120 milliseconds.
B0019 02 Stage 1 or B0020 02 Stage 2
The I/P module high and/or low circuit is short to ground for 120 milliseconds.
B0019 04 Stage 1 or B0020 04 Stage 2
The I/P module high and/or low circuit is open for 120 milliseconds.
B0019 0D Stage 1 or B0020 0D Stage 2
The I/P module deployment loop resistance is more than 5.1 ohms for 120 milliseconds.
B0019 0E Stage 1 or B0020 0E Stage 2
The I/P 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
SIR Schematics [1][2]Air Bag Systems
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
* J 38715-A Driver and Passenger SIR Load Tool
* J-38715-30A SIR Load Tool Adapter
Circuit/System Testing
Important: Refer to SIR Service Precautions Technician Safety Information.
When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
* Inflatable restraint module
* SDM module
* Front end sensor 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 shoring-bars within the connector allowing the deployment circuit to operate properly.
1. Verify that the I/P inflatable restraint module connector and CPA are engaged.
• If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the harness connector at the I/P inflatable restraint module.
3. With the appropriate load tool adapter, connect J 38715-A in place of the I/P inflatable restraint module.
4. Ignition ON, with a scan tool, verify the appropriate DTC is set as current.
• If the DTC is not set or is set as history, cycle the ignition OFF, disconnect the load tool and adapter, reconnect the harness connector at the I/P inflatable restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the I/P inflatable restraint module.
5. Ignition OFF, disconnect the load tool and the adapter.
6. Disconnect the harness connector at the SDM.
7. Ignition ON, test for less than 1.0 volt between the appropriate low control circuit terminal listed below and ground:
* I/P module Stage 1 terminal 19
* I/P module Stage 2 terminal 12
• If not within the specified range, test the control circuit for a short to voltage.
8. Test for less than 1.0 volt between the appropriate high control circuit terminal listed below and ground:
* I/P module Stage 1 terminal 18
* I/P module Stage 2 terminal 13
• If not within the specified range, test the control circuit for a short to voltage.
9. Ignition OFF, test for infinite resistance between the appropriate low control circuit terminal listed below and ground:
* I/P module Stage 1 terminal 19
* I/P module Stage 2 terminal 12
• If not within the specified range, test the control circuit for a short to ground.
10. Test for infinite resistance between the appropriate high control circuit terminal listed below and ground:
* I/P module Stage 1 terminal 18
* I/P module Stage 2 terminal 13
• If not within the specified range, test the control circuit for a short to ground.
11. Test for less then 1.0 ohm between the appropriate low control circuit terminals listed below:
* I/P module Stage 1 terminal B and SDM terminal 19
* I/P module Stage 2 terminal B and SDM terminal 12
• If not within the specified range, test the control circuit for an open/high resistance.
12. Test for less then 1 ohm between the appropriate high control circuit terminals listed below:
* I/P module Stage 1 terminal A and SDM terminal 18
* I/P module Stage 2 terminal A and SDM terminal 13
• If not within the specified range, test the control circuit for an open/high resistance.
13. If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Instrument Panel Inflatable Restraint Module Replacement Instrument Panel Inflatable Restraint Module Replacement
* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Control Module References Programming and Relearning for SDM replacement, setup, and programming