Service Information

Captiva

DTC B0012

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 B0012 01: Driver Steering Wheel Air Bag Deployment Loop Short to Battery

DTC B0012 02: Driver Steering Wheel Air Bag Deployment Loop Short to Ground

DTC B0012 04: Driver Steering Wheel Air Bag Deployment Loop Open Circuit

DTC B0012 0D: Driver Steering Wheel Air Bag Deployment Loop Resistance Above Threshold

DTC B0012 0E: Driver Steering Wheel Air Bag Deployment Loop Resistance Below Threshold

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Driver Steering Wheel Air Bag High Circuit	B0012 02	B0012 0D	B0012 04	B0012 01	B0012 0E
Driver Steering Wheel Air Bag Low Circuit	B0012 02	B0012 0D	B0012 04	B0012 01	B0012 0E

Circuit/System Description

When the ignition switch is turned to ON, the inflatable restraint sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within SDM itself.

Upon passing these tests, ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low circuits to detect shorts to ground or voltage in the deploy loops. The SDM checks the wiring connection to the driver steering wheel air bag deployment loop by letting an infinitesimal current flow through internal circuit and verify the resistance.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0012 01 Stage 1

The driver steering wheel air bag high and/or low circuit is shorted to voltage for 120 milliseconds.

B0012 02 Stage 1

The driver steering wheel air bag high and/or low circuit is shorted to ground for 120 milliseconds.

B0012 04 Stage 1

The driver steering wheel air bag high and/or low circuit is opened for 120 milliseconds.

B0012 0D Stage 1

The driver steering wheel air bag deployment loop resistance is more than 4.24 ohms for 120 milliseconds.

B0012 0E Stage 1

The driver steering wheel air bag deployment loop resistance is less than 2.01 ohms for 120 milliseconds.

Action Taken When the DTC Sets

•	The SDM commands the AIR BAG indicator ON via serial data communications.

•	The SDM will attempt to deploy the air bag even if a fault is detected.

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 100 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Circuit/System Testing

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

•	Driver steering wheel air bag

•	The steering wheel coil module

•

The SDM

•	Driver steering wheel air bag wiring harness connector

•	The steering wheel coil module wiring harness connector

•	The SDM wiring harness connector

Ignition OFF, disconnect the driver steering wheel air bag and steering wheel module coil connector.
Test the high and low circuits between the steering wheel module coil connector and the driver steering wheel air bag connector 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, replace the steering wheel module coil.

Ignition OFF, disconnect the SDM connector.
Test the high and low circuits between the SDM and steering wheel module coil connector 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.

If all circuits test normal then replace the SDM.
Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0012 is set as history.

⇒	If DTC B0012 is current replace the driver steering wheel air bag.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Steering Wheel Airbag Coil Replacement

•	Steering Wheel Inflatable Restraint Module Replacement

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