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 B0012: Passenger Frontal Deployment Loop (Stage 2) Resistance Low
DTC B0013: Passenger Frontal Deployment Loop (Stage 2) Open
DTC B0014: Passenger Frontal Deployment Loop (Stage 2) Voltage Out of Range
DTC B0016: Passenger Frontal Deployment Loop (Stage 1) Resistance Low
DTC B0017: Passenger Frontal Deployment Loop (Stage 1) Open
DTC B0018: Passenger Frontal Deployment Loop (Stage 1) Voltage Out of Range

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
I/P Module Stage 1 High Circuit | B0018 | B0018 | B0017 | B0018 | B0016
I/P Module Stage 1 Low Circuit | B0018 | B0018 | B0017 | B0018 | B0016
I/P Module Stage 2 High Circuit | B0014 | B0014 | B0013 | B0014 | B0012
I/P Module Stage 2 Low Circuit | B0014 | B0014 | B0013 | B0014 | B0012

### Circuit/System Description

The passenger deployment loop consists of a dual stage inflatable restraint instrument panel (I/P) module. The I/P module high circuits, and the I/P module low circuits exist for both stages 1 and 2. There are 2 shorting bars used within the I/P module connector. These shorting bars short together the I/P module stage 1 high circuits, and low circuits, and the I/P module stage 2 high circuits and low circuits when the connector is disconnected. This prevents unwanted deployment of the inflator module during servicing. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop. This flow of current will 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. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

#### B0012 stage 2 or B0016 stage 1

The I/P module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

#### B0013 stage 2 or B0017 stage 1

• | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and the I/P module stage 1 or stage 2 deployment loop is more than 6 ohms for 500 milliseconds.

• | The I/P module stage 1 or stage 2 deployment loop resistance is more than 4.8 ohms for 500 milliseconds.

#### B0014 stage 2 or B0018 stage 1

• | The I/P module stage 1 or stage 2 high and/or low circuits is short to ground or short to voltage for 500 milliseconds.

• | The I/P module stage 1 or stage 2 high circuit is less than 2.4 volts and I/P module stage 1 or stage 2 deployment loop resistance is less than 6 ohms for 500 milliseconds.

### Action Taken When the DTC Sets

• | The SDM commands the AIR BAG indicator ON via class 2 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 DTC 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. The following are possible causes of the malfunction:

• | A short between the I/P module stage 1 or stage 2, high and low circuits

• | An open or a high resistance in the I/P module stage 1 or stage 2, high or low circuits

• | A short to ground or a short to voltage in the I/P module stage 1 or stage 2, high or low circuits

• | A malfunctioning I/P module connector

• | A malfunctioning SDM connector

• | A malfunctioning I/P module

• | A malfunctioning SDM

### 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/Passenger Load tool

• | EL 38715-125 Load Tool Adapter

### Circuit/System Testing

1. With the ignition OFF, disconnect I/P module in-line connector.
2. Inspect the component and wiring harness sides of the in-line connector for the I/P module for damage or corrosion.

⇒ | 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.

3. Use EL 38715-125 adapter to connect the J 38715-A SIR Driver/Passenger Load Tool to the harness side of the I/P module in-line wiring harness connector. Use the BASE of COLUMN and PASSENGER INFLATOR connectors located on the load tool.
4. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012, B0013, B0014, B0016, B0017, or B0018 are set in history.

⇒ | If DTC B0012, B0013, B0014, B0016, B0017, or B0018 is history replace the I/P module.

5. With the ignition OFF, disconnect and remove the J 38715-A and adapter.
6. Remove the inflatable restraint sensing and diagnostic module (SDM) connector. Inspect the SDM connector for damage or corrosion that may cause a malfunction in the I/P module stage 1 or stage 2 high and/or low circuits.

⇒ | If damage or corrosion is found make the appropriate repair.

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.

⇒ | If circuits test good then replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | SIR/SRS Wiring Repairs

• | Inflatable Restraint Instrument Panel Module Replacement

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