B0019
DTC B0019 or B0020
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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
If a malfunction is detected, a DTC will be stored in non-volatile memory. 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
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 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.
Special Tools
* J38715-A Driver and Passenger SIR Load Tool
* J-38715-30A SIR Load Tool Adapter
Circuit/System Testing
Important:
* 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:
- The front end sensor
- The SDM module
- The front end sensor wiring harness connector
- The SDM wiring harness connector
1. Ignition OFF, disconnect the harness connector at the I/P inflatable restraint module.
2. With the J38715-80 SIR load tool adapter, connect J38715-A in place of the I/P inflatable restraint module.
3. Ignition ON, with a scan tool, verify the appropriate DTC is set as current.
• If DTC is not set or is set as history, replace the I/P inflatable restraint module.
4. Ignition OFF, disconnect J38715-A and the J38715-80 SIR load tool adapter.
5. Disconnect the harness connector at the SDM.
6. Ignition ON, test for less than 1-volt between the appropriate high control circuit and ground listed below:
* I/P module Stage 1 terminal A
* I/P module Stage 2 terminal A
• If not within the specified range, test the circuit for a short to voltage.
7. Test for less than 1-volt between the appropriate low control circuit terminal and ground listed below:
* I/P module Stage 1 terminal B
* I/P module Stage 2 terminal B
• If not within the specified range, test the circuit for a short to voltage.
8. Ignition OFF, test for infinite resistance between the appropriate high control circuit terminal and ground listed below:
* I/P module Stage 1 terminal A
* I/P module Stage 2 terminal A
• If not within the specified range, test the circuit for a short to ground.
9. Test for infinite resistance between the applicable low control circuit terminal and ground listed below:
* I/P module Stage 1 terminal B
* I/P module Stage 2 terminal B
• If not within the specified range, test the circuit for a short to ground.
10. Test for less then 1 ohm between the following 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 circuit for an open/high resistance.
11. Test for less then 1 ohm between the following 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 circuit for an open/high resistance.
12. If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Inflatable Restraint Instrument Panel Module Replacement
* SIR/SRS Wiring Repairs