For 1990-2009 cars

### 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 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 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 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

• | SIR/SRS Wiring Repairs

#### Special Tools Required

• | J 38715-A SIR Driver/Passenger Load Tool

• | J38715-80 Driver/Passenger 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 wiring harness connector

• | The SDM wiring harness connector

1. Ignition OFF, remove the right 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 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. 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. Ignition OFF, disconnect and remove the J 38715-A and adapter, then remove the SDM connector.
5. 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.

⇒ | If any of the above conditions are found make the appropriate repair.

6. 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

• | Control Module References for SDM replacement, setup, and programming