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B0013



DTC B0012 or B0013

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 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

DTC B0012 0D
Driver Steering Wheel Air Bag Deployment Loop Stage 1 High Resistance

DTC B0012 0E
Driver Steering Wheel Air Bag Deployment Loop Stage 1 Low Resistance

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

DTC B0013 0D
Driver Steering Wheel Air Bag Deployment Loop Stage 2 High Resistance

DTC B0013 0E
Driver Steering Wheel Air Bag Deployment Loop Stage 2 Low Resistance

Diagnostic Fault Information






Circuit/System Description
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 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 the steering wheel air bag coil connector which will short together both steering wheel air bag stage 1 high control circuit and steering wheel air bag stage 1 low control circuit and both steering wheel air bag stage 2 high control circuit and steering wheel air bag stage 2 low control circuit when the connector is disconnected. This will help to prevent unwanted deployment of the steering wheel air bag during servicing.

Conditions for Running the DTC
Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0012 01 stage 1 or B0013 01 stage 2
The steering wheel air bag deployment loop is shorted to voltage for 2 seconds.

B0012 02 stage 1 or B0013 02 stage 2
The steering wheel air bag deployment loop is shorted to ground for 2 seconds.

B0012 04 stage 1 or B0013 04 stage 2
The steering wheel air bag deployment loop is open for 2 seconds.

B0012 0D stage 1 or B0013 0D stage 2
The steering wheel air bag deployment loop resistance is greater than 4.4 ohm for 2 seconds.

B0012 0E stage 1 or B0013 0E stage 2
The steering wheel air bag deployment loop resistance is less than 1.7 ohm for 2 seconds.

Action Taken When the DTC Sets
- The SDM requests the instrument cluster to illuminate the AIR BAG indicator.
- The SDM will store a DTC, however if an event occurs the system will still attempt deployment.

Conditions for Clearing the DTC
- The condition for setting the DTC is no longer exists.
- A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

NOTE: The following diagnostic aids apply for both current and history DTCs.

A worn steering wheel air bag coil can cause a repeated history DTC to set. To verify this condition, turn the steering wheel 360 degrees in one direction then back 360 degrees in the other direction. At the same time view the scan tool Deployment Loop Resistance parameters.

An incorrectly installed connector position assurance (CPA) or incorrectly seated connector can cause a shorting bar to short both control circuits together. Check the connectors and CPAs if a DTC with symptom byte 02 or 0E is set, to ensure the shorting bars are not causing the circuits to be shorted together. Shorting bars are used in the locations listed below:
- Steering wheel air bag assembly
- Steering wheel air bag coil assembly
- Inline harness connectors
- Harness side of the SDM connector

Terminal fretting or incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting or incorrectly seated connector if a DTC with symptom byte 04 or 0D is set.

If the steering wheel air bag has inflated under unexpected conditions and/or DTC with symptom byte 01 is set, check both control circuits for a short to voltage.

Reference Information

Schematic Reference
SIR Schematics [1][2]Air Bag Systems

Connector End View Reference
Component Connector End Views

Description and Operation
SIR System Description and Operation Description and Operation

Electrical Information Reference
- Circuit Testing
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
- Connector Repairs

Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification

NOTE: Refer to SIR Service Precautions Service Precautions.

Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

- Driver Steering Wheel Air bag
- Driver steering wheel air bag coil
- SDM
- Air bag wiring harness connector
- SDM wiring harness connector

NOTE: The connector and connector position assurance (CPA) may seat independent of each other. The connector and connector position assurance (CPA) may seat independently 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.

If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.

1. Verify the appropriate scan tool Deployment Loop Resistance parameters stay consistently between 2.1 and 4.0 Ohm without any spikes or dropouts while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
2. Verify DTC B0012 or B0013 is only set as a history DTC.
3. Verify the scan tool Deployment Loop Resistance parameters stay consistently between 2.1 and 4.0 Ohm without any drop outs or spikes while moving the harness near each connector listed below.
- X85 Steering wheel air bag coil
- F107 Steering wheel air bag.
- Any inline harness connector
- K36 SDM
- Inspect each connector terminal for damage or corrosion and repair as necessary.
- Apply Nyogel lubricant 760G to each connector terminal.
- Insure each connector and CPA is correctly seated.

4. All OK.

Circuit/System Testing
1. Ignition OFF, disconnect the scan tool and disconnect the appropriate harness connector listed below at the F107 driver steering wheel air bag. It may take up to 2 minutes for all vehicle systems to power down.
- DTC B0012 connector X1
- DTC B0013 connector X2

2. Test for greater than 25 Ohm between the control circuit terminal 1 and the control circuit terminal 2.
2.1. Disconnect the X1 harness connector at the K36 SDM.
2.2. Test for infinite resistance between the two control circuits.

3. Ignition ON.
4. Test for less than 11 V between the control circuit terminals listed below and ground:
- Control circuit terminal 1
- Control circuit terminal 2
4.1. Ignition OFF, disconnect the X1 harness connector at the K36 SDM, ignition ON.
4.2. Test for less than 1 V between the control circuit and ground.

5. Ignition OFF.
6. Test for greater than 25 � between the control circuit terminals listed below and ground:
- Control circuit terminal 1
- Control circuit terminal 2
6.1. Disconnect the X1 harness connector at the K36 SDM.
6.2. Test for infinite resistance between the control circuit and ground.

7. Install a 3 A fused jumper wire between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
8. Verify the scan tool Deployment Loop Resistance parameter is consistently less than 2 ohm while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.
8.1. Ignition OFF, disconnect the X1 harness connector at the K36 SDM.
8.2. Test for less than 2 Ohm in the K85 steering wheel airbag coil and each control circuit end to end.

9. Replace the F107 steering wheel air bag.

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

- Steering Wheel Inflatable Restraint Module Coil Replacement
- Steering Wheel Inflatable Restraint Module Replacement
- SIR/SRS Wiring Repairs
- Control Module References for SDM replacement, programming and setup
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