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 provides an overview of each diagnostic category.
DTC Descriptor
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 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 instrument panel (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 GMLAN serial data.
* 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.
Circuit/System Testing
1. Ignition OFF, inspect the component and wiring harness sides of the in-line connector for the I/P module for damage or corrosion located above the passenger hinge pillar trim. Verify there is no damage or corrosion found.
• If the in-line connector for the I/P module is damaged, the I/P module must be replaced.
• If the I/P module wiring harness side connector is damaged, replace the harness side of the connector.
2. Use EL 38715-160 adapter 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.
3. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0019 or B0020 are set current.
• If DTC B0019 or B0020 is history replace the I/P module.
4. With the ignition OFF, disconnect and remove the J 38715-A and adapter. Then remove the SDM connector and inspect the SDM connector for corrosion or damage. Verify there is no damage or corrosion found.
• If the connector for the SDM is damaged, the SDM must be replaced.
• If the wiring harness side of the SDM connector is damaged, replace the harness side of the connector.
5. 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 any of the above conditions are found make the appropriate repair.
6. If circuits test good then replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
* Inflatable Restraint Instrument Panel Module Replacement
* SIR/SRS Wiring Repairs
* Control Module References for SDM replacement, setup, and programming. Verification Tests