GM Service Manual Online
For 1990-2009 cars only

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 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

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

I/P Module Stage 1 High Circuit

B0019 02

B0019 0D

B0019 04

B0019 01

B0019 0E

I/P Module Stage 1 Low Circuit

B0019 02

B0019 0D

B0019 04

B0019 01

B0019 0E

I/P Module Stage 2 High Circuit

B0020 02

B0020 0D

B0020 04

B0020 01

B0020 0E

I/P Module Stage 2 Low Circuit

B0020 02

B0020 0D

B0020 04

B0020 01

B0020 0E

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.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Special Tools Required

    • J 38715-A Driver and Passenger SIR Load Tool
    • J 38715-80 SIR Load Tool Adapter

Circuit/System Testing

    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 module wiring harness connector
       • The SDM wiring harness connector

  1. Ignition OFF, remove the right instrument panel (I/P) outer trim cover and disconnect I/P module in-line connector. Refer to Instrument Panel Outer Trim Cover Replacement .
  2. 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.
  3. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0019 or B0020 are set current.
  4. If DTC B0019 or B0020 is history replace the I/P module.
  5. Ignition OFF, disconnect and remove the J 38715-A and adapter.
  6. Disconnect the SDM harness connector.
  7. Test the high and low circuits between the SDM and I/P module for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.
  8. If any of the above conditions are found make the appropriate repair.
  9. If all circuits test normal 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