For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using the 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

### 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

### 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

The I/P module high and/or low circuit is short to voltage.

#### B0019 02

The I/P module high and/or low circuit is short to ground.

#### B0019 04

The I/P module high and/or low circuit is open.

#### B0019 0D

The I/P module deployment loop resistance is more than 3.54 ohms.

#### B0019 0E

The I/P module deployment loop resistance is less than 1.77 ohms.

### 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

### 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, open and lower glove box door fully and disconnect I/P module in-line connector.
2. Disconnect the SDM connector. Refer to SDM replacement in Repair Instructions for connector location.
3. Test the high and low circuits between the SDM and I/P module for a short to voltage, short to ground, short between circuits or open/high resistance. Verify that a short to voltage, short to ground, short between circuits or open/high resistance does not exist.

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

4. If all circuits test normal then replace the SDM.
5. Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0019 is set current.

⇒ | Replace the I/P module.

### 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