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SIR Service Precautions > < Air Bag Indicator Circuit Malfunction - Driver

Astra J

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 01
—

Driver Steering Wheel Air Bag Stage 1 Low Control
B0012 02, B0012 0E
B0012 0D
B0012 04
B0012 01
—

Driver Steering Wheel Air Bag Stage 2 High Control
B0013 02, B0013 0E
B0013 0D
B0013 04
B0013 01
—

Driver Steering Wheel Air Bag Stage 2 Low Control
B0013 02, B0013 0E
B0013 0D
B0013 04
B0013 01
—
 

Circuit/System Description

During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module will allow current to flow through the deployment loop in order to deploy the driver steering wheel air bag. The inflatable restraint sensing and diagnostic module 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 driver steering wheel air bag coil 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 V.

Conditions for Setting the DTC

B0012 01 stage 1 or B0013 01 stage 2

The driver steering wheel air bag control circuit is shorted to voltage for 2 seconds.

B0012 02 stage 1 or B0013 02 stage 2

The driver steering wheel air bag control circuit is shorted to ground for 2 seconds.

B0012 04 stage 1 or B0013 04 stage 2

The driver steering wheel air bag control circuit is open for 2 seconds.

B0012 0D stage 1 or B0013 0D stage 2

The driver steering wheel air bag deployment loop resistance is more than 5.5 Ω for 2 seconds.

B0012 0E stage 1 or B0013 0E stage 2

The driver steering wheel air bag deployment loop resistance is less than 1.7 Ω for 2 seconds.

Action Taken When the DTC Sets

•  The inflatable restraint sensing and diagnostic module requests the instrument cluster to illuminate the SIR system AIR BAG indicator.
•  The inflatable restraint sensing and diagnostic module 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 with symptom byte 04 or 0D. To verify this condition, turn the steering wheel 360 degrees in one direction then back 360 degrees in the other direction, multiple times, while viewing the scan tool Deployment Loop Resistance 1 and 2 parameters.

An incorrectly installed 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:

•  Driver steering wheel air bag
•  Steering wheel air bag coil assembly
•  Inline connectors – on the driver steering wheel air bag side of the harness connector
•  Harness side of the inflatable restraint sensing and diagnostic module connector

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

EL-38125-580  Terminal Release Tool Kit

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
  -  Air bag wiring harness connector
  -  Inflatable restraint sensing and diagnostic module 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.
•  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 scan tool Deployment Loop Resistance 1 and 2 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.
    ⇒  If less than 2.1 or greater than 4.0 Ω

Refer to Circuit/System Testing.     ⇒  If there are spikes or dropouts

Replace the X85 driver steering wheel air bag coil.     ⇓  If within 2.1 and 4.0 Ω without any spikes or dropouts

2. DTC B0012 or B0013 should only be set as a history DTC.
    ⇒  If the DTC is set as current

Refer to Circuit/System Testing.     ⇓  If the DTC is set as history

3. Verify the scan tool Deployment Loop Resistance 1 and 2 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 harness inline
  •  K36 inflatable restraint sensing and diagnostic module
    ⇒  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.
    ⇓  If within 2.1 and 4.0 Ω without any spikes or dropouts

4. All OK

Circuit/System Testing

1. Ignition OFF, disconnect the scan tool and disconnect the harness connector listed below at the F107 driver steering wheel air bag then wait for 120 seconds.
  •  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.
    ⇒  If 25 Ω or less

  2.1 Disconnect the harness connector X1 at the K36 inflatable restraint sensing and diagnostic module.
Note:  Some connectors may be equipped with shorting bars as a safety component to prevent accidental inflator deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.
  2.2 Test for infinite resistance between the two control circuits.
⇒  If less than infinite resistance, repair the short between the two circuits.
⇒  If infinite resistance, replace the K36 inflatable restraint sensing and diagnostic module.
    ⇓  If greater than 25 Ω

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
    ⇒  If 11 V or greater

  4.1 Ignition OFF, disconnect the harness connector X1 at the K36 inflatable restraint sensing and diagnostic module, ignition ON.
  4.2 Test for less than 1 V between the control circuit and ground.
⇒  If 1 V or greater, repair the short to voltage on the circuit.
⇒  If less than 1 V, replace the K36 inflatable restraint sensing and diagnostic module.
    ⇓  If less than 11 V

5. Ignition OFF.
6. Install a 3 A fused jumper wire between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
7. 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.
    ⇒  If the reading is erratic while turning the steering wheel

Replace the X85 driver steering wheel air bag coil.     ⇒  If 2 Ω or greater

  7.1 Ignition OFF, disconnect the harness connector X1 at the K36 inflatable restraint sensing and diagnostic module.
  7.2 Test for less than 2 Ω in the driver steering wheel air bag coil and each control circuit end to end.
⇒  If 2 Ω or greater, replace the coil or repair the open/high resistance in the circuit.
⇒  If less than 2 Ω, replace the K36 inflatable restraint sensing and diagnostic module.
    ⇓  If less than 2 Ω

8. Ignition OFF, connect the harness connector at the F107 driver steering wheel air bag, press in the CPA (if equipped) until an audible and/or tactile click is heard.
9. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
10. Verify DTC B0012 or B0013 is not set.
    ⇒  If DTC B0012 or B0013 is set

Replace the F107 driver steering wheel air bag.     ⇓  If DTC B0012 or B0013 is not set

11. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

•  Control Module References for inflatable restraint sensing and diagnostic module replacement, programming and setup

SIR Service Precautions > < Air Bag Indicator Circuit Malfunction - Driver