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 Control | B0018 | B0018 | B0017 | B0018 | B0016
I/P Module Stage 1 Low Control | B0018 | B0018 | B0017 | B0018 | B0016
I/P Module Stage 2 High Control | B0014 | B0014 | B0013 | B0014 | B0012
I/P Module Stage 2 Low Control | 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 greater 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 are shorted to voltage or shorted to ground 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

• | The SIR system is disabled and no deployments are allowed.

### Conditions for Clearing the DTC

• | The condition for setting the DTC no longer exists.

• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools

J 38715-A Driver/Passenger Load tool

### Circuit/System Testing

Important: Refer to SIR Service Precautions.

When removing the connectors inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:

• | Inflatable restraint module

• | SDM module

• | Inflatable restraint module wiring harness connector

• | SDM wiring harness connector

The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.

1. Verify that the appropriate inflator restraint module connector and CPA are engaged.

⇒ | If the above condition is not found, make the appropriate repair.

2. Ignition OFF, disconnect the harness connector at the appropriate inflatable restraint module.
3. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the inflator restraint module.
4. Ignition ON, with a scan tool, verify the appropriate DTC is set as current.

⇒ | If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the inflator restraint module, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the inflator restraint module.

5. Ignition OFF, disconnect special tool J 38715-A and the adaptor.
6. Disconnect the harness connector at the SDM.
7. Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:

• | I/P module Stage 1 terminal 9

• | I/P module Stage 2 terminal 30

⇒ | If greater than the specified value, test the high control circuit for a short to voltage.

8. Test for less than 1 volt between the appropriate low control circuit terminal listed below and ground:

• | I/P module Stage 1 terminal 10

• | I/P module Stage 2 terminal 31

⇒ | If greater than the specified value, test the low control circuit for a short to voltage.

9. Ignition OFF, test for infinite resistance between the appropriate high control circuit terminal listed below and ground:

• | I/P module Stage 1 terminal 9

• | I/P module Stage 2 terminal 30

⇒ | If not the specified value, test the high control circuit for a short to ground.

10. Test for infinite resistance between the appropriate low control circuit terminal listed below and ground:

• | I/P module Stage 1 terminal 10

• | I/P module Stage 2 terminal 31

⇒ | If not the specified value, test the low control circuit for a short to ground.

11. Test for less then 1 ohm between the following high control circuit terminals listed below:

• | I/P module Stage 1 terminal 4 and SDM terminal 9

• | I/P module Stage 2 terminal 2 and SDM terminal 30

⇒ | If greater than the specified range, test the high control circuit for an open/high resistance.

12. Test for less then 1 ohm between the following low control circuit terminals listed below:

• | I/P module Stage 1 terminal 3 and SDM terminal 10

• | I/P module Stage 2 terminal 1 and SDM terminal 31

⇒ | If greater than the specified range, test the low control circuit for an open/high resistance.

13. If all circuits test normal, 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