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DTC B0012 or 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 Short to Ground High Resistance Open Short to Voltage Signal Performance
Driver Steering Wheel Air Bag Stage 1 High Control B0012 02, B0012 0E B0012 0D B0012 04, B0012 0D B0012 01 -
Driver Steering Wheel Air Bag Stage 1 Low Control B0012 02, B0012 0E B0012 0D B0012 04, B0012 0D B0012 01 -
Driver Steering Wheel Air Bag Stage 2 High Control B0013 02, B0013 0E B0013 0D B0013 04, B0013 0D B0013 01 -
Driver Steering Wheel Air Bag Stage 2 Low Control B0013 02, B0013 0E B0013 0D B0013 04, B0013 0D B0013 01 -


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 Ω 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 Ω for 2 seconds.

Action Taken When the DTC Sets


• Inflatable restraint sensing and diagnostic module (SDM) requests that the instrument group must illuminate the AIR BAG indicator.

• Inflatable restraint sensing and diagnostic module (SDM) stores 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 Inflatable restraint sensing and diagnostic module (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

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System 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 .

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

• Inflatable restraint sensing and diagnostic module (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 Ω without any spikes or dropouts while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.

2. If less than 2.1 or greater than 4.0 Ω

Refer to Circuit/System Testing.

3. If there are spikes or dropouts

Replace the X85 driver steering wheel air bag coil.

4. If within 2.1 and 4.0 Ω without any spikes or dropouts

5. Verify DTC B0012 or B0013 is only set as a history DTC.

6. If the DTC is set as current

Refer to Circuit/System Testing.

7. If the DTC is set as history

8. Verify the scan tool Deployment Loop Resistance parameters stay consistently between 2.1 and 4.0 Ω 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 Inflatable restraint sensing and diagnostic module (SDM)

9. If the reading is erratic while moving the harness, perform the following

• 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.

10. If within 2.1 and 4.0 Ω without any spikes or dropouts

11. 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 Ω between the control circuit terminal 1 and the control circuit terminal 2.

3. If 25 Ω or less

3.1. Disconnect the harness connector X1 at K36 Inflatable restraint sensing and diagnostic module (SDM).

3.2. Test for infinite resistance between the two control circuits.

3.3. If less than infinite resistance, repair the short between the two circuits.

3.4. If infinite resistance, replace the K36 SDM.

4. If greater than 25 Ω

5. Ignition ON.

6. Test for less than 11 V between the control circuit terminals listed below and ground:

• Control circuit terminal 1

• Control circuit terminal 2

7. If 11 V or greater

7.1. Ignition OFF, disconnect the X1 harness connector at the K36 SDM, ignition ON.

7.2. Test for less than 1 V between the control circuit and ground.

7.3. If 1 V or greater, repair the short to voltage on the circuit.

7.4. If less than 1 V, replace the K36 SDM.

8. If less than 11 V

9. Ignition OFF.

10. Test for greater than 25 Ω between the control circuit terminals listed below and ground:

• Control circuit terminal 1

• Control circuit terminal 2

11. If 25 Ω or less

11.1. Disconnect the X1 harness connector at the K36 SDM.

11.2. Test for infinite resistance between the control circuit and ground.

11.3. If less than infinite resistance, repair the short to ground on the circuit.

11.4. If infinite resistance, replace the K36 SDM.

12. If greater than 25 Ω

13. Install a 3 A fused jumper wire between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.

14. Verify the scan tool Deployment Loop Resistance parameter is consistently less than 2 Ω while turning the steering wheel 360 degrees in one direction then back 360 degrees in the other direction.

15. If the reading is erratic while turning the steering wheel

Replace the X85 driver steering wheel air bag coil.

16. If 2 Ω or greater

16.1. Ignition OFF, disconnect the X1 harness connector at the K36 SDM.

16.2. Test for less than 2 Ω in the K85 steering wheel airbag coil and each control circuit end to end.

16.3. If 2 Ω or greater, replace the coil or repair the open/high resistance in the circuit.

16.4. If less than 2 Ω, replace the K36 SDM.

17. If less than 2 Ω

18. Apply Nyogel lubricant 760G on pin to F107 Driver Steering Wheel Air bag harness connector to address the high-resistance due to corrosion.

19. With ignition OFF, connect F107 Driver Steering Wheel Air bag harness connector.

20. Ignition ON. Verify that diagnostic trouble code B0012 or B0013 have not been set.

21. If diagnostic trouble code B0012 or B0013 is set:

Replace F107 steering wheel air bag.

22. If diagnostic trouble code B0012 or B0013 is not set:

23. OK.


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

• Information about replacement, setting and programming of the Inflatable restraint sensing and diagnostic module (SDM) can be found in References for control modules