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Home >> Chevy Truck >> 2013 >> Express 3500 V8-6.0L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0013

B0013




DTC B0012 or B0013

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0012 01

-
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Battery

DTC B0012 02

-
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Ground

DTC B0012 04

-
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Open Circuit

DTC B0012 0D

-
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Resistance Above Threshold

DTC B0012 0E

-
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Resistance Below Threshold

DTC B0013 01

-
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Battery

DTC B0013 02

-
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Short to Ground

DTC B0013 04

-
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Open Circuit

DTC B0013 0D

-
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Resistance Above Threshold

DTC B0013 0E

-
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Resistance Below Threshold

Diagnostic Fault Information






Circuit/System Description

If a malfunction is detected, a DTC will be stored in non-volatile memory. During a 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 driver steering wheel air bag. 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 each connector which will short together both driver steering wheel air bag stage 1 high circuit and driver steering wheel air bag stage 1 low circuit and both driver steering wheel air bag stage 2 high circuit and driver steering wheel air bag stage 2 low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0012 01 Stage 1 or B0013 01 Stage 2

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

B0012 02 Stage 1 or B0013 02 Stage 2

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

B0012 04 Stage 1 or B0013 04 Stage 2

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

B0012 0D Stage 1 or B0013 0D Stage 2

The driver steering wheel air bag deployment loop resistance is greater than 5.1 ohms for 120 milliseconds.

B0012 0E Stage 1 or B0013 0E Stage 2

The driver steering wheel air bag deployment loop resistance is less than 1.3 ohms for 120 milliseconds.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

* The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

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.

Diagnostic Aids

* When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits.

* This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

SIR System Description and Operation SIR System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

J 38715-A - SIR Driver/Passenger Load Tool

Circuit/System Testing

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


* Driver steering wheel air bag


* SDM


* Driver steering wheel air bag wiring harness connector


* SDM wiring harness connector


Important:
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 steering wheel module connector and the CPA are engaged.

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

2. Ignition OFF, disconnect the harness connector at the driver steering wheel air bag.

3. Install a 3A fused jumper between the J 38715-A - SIR driver/passenger load tool and the harness connector of the driver steering wheel air bag.

4. Ignition ON, verify DTC is set as current.

• If the DTC is not set or is set as history, cycle ignition OFF, disconnect the load tool and the jumper, reconnect the harness connector at the driver steering wheel air bag, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the driver steering wheel air bag.

5. Ignition OFF, disconnect the load tool and the jumper.

6. Disconnect the harness connector at the steering wheel module coil.

7. Install a 3A fused jumper between the J 38715-A - SIR driver/passenger load tool and the harness connector of the steering wheel module coil.

8. Ignition ON, verify the DTC is set as current.

• If DTC is not set or is set as history, replace the steering wheel module coil.

9. Ignition OFF, disconnect the load tool and jumper.

10. Disconnect the harness connector at the SDM.

11. Ignition ON, test for less than 1 volt between the appropriate high control circuit listed below and ground:

* Steering wheel module coil harness connector - Stage 1 terminal A1 X276

* Steering wheel module coil harness connector - Stage 2 terminal B1 X276

• If greater than the specified range, test the control circuit for a short to voltage.

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

* Steering wheel module coil harness connector - Stage 1 terminal A2 X276

* Steering wheel module coil harness connector - Stage 2 terminal B2 X276

• If greater than the specified range, test the control circuit for a short to voltage.

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

* Steering wheel module coil harness connector - Stage 1 terminal A1 X276

* Steering wheel module coil harness connector - Stage 2 terminal B1 X276

• If less than the specified value, test the control circuit for a short to ground.

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

* Steering wheel module coil harness connector - Stage 1 terminal A2 X276

* Steering wheel module coil harness connector - Stage 2 terminal B2 X276

• If less than the specified value, test the control circuit for a short to ground.

15. Test for less then 5 ohms between the appropriate high control circuit terminals listed below:

* Steering wheel module coil harness connector - Stage 1 terminal A1 X276 and the SDM terminal 9

* Steering wheel module coil harness connector - Stage 2 terminal B1 X276 and the SDM terminal 5

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

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

* Steering wheel module coil harness connector - Stage 1 terminal A2 X276 and the SDM terminal 8

* Steering wheel module coil harness connector - Stage 2 terminal B2 X276 and the SDM terminal 4

• If greater that the specified range, test the control circuit for an open/high resistance.

17. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs

* Steering Wheel Airbag Coil Replacement Removal and Replacement

* Steering Wheel Inflatable Restraint Module Replacement Steering Wheel Inflatable Restraint Module Replacement

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

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