Diagnostic Instructions

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

B0014 stage 2 or B0018 stage 1

Action Taken When the DTC Sets

Conditions for Clearing the DTC

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

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.