Volt

DTC B0012 or B0013

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.

Ignition voltage is between 9-16 V.

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.

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, multiple times, while viewing the scan tool Deployment Loop Resistance 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:

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.

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

Note: Refer to SIR Service Precautions

Note: 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.

1. Verify the 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.

⇒	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 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 SDM

⇒	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

1. Vehicle OFF, disconnect the scan tool and disconnect the harness connector X1 at the F107 driver steering wheel air bag then wait for 120 seconds.
2. Test for greater than 25 Ω between the control circuit terminals 1 X1 and 2 X1 (Stage 1) or terminals 1 X2 and 2 X2 (Stage 2).

⇒	If 25 Ω or less

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

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 SDM.

⇓	If greater than 25 Ω

3. Vehicle in Service Mode.
4. Test for less than 11 V between the control circuit terminals listed below and ground:

•	Control circuit terminal 1 X1 (stage 1)

•	Control circuit terminal 2 X1 (stage 1)

•	Control circuit terminal 1 X2 (stage 2)

•	Control circuit terminal 2 X2 (stage 2)

⇒	If 11 V or greater

4.1.	Vehicle OFF, disconnect the harness connector X1 at the K36 SDM, Vehicle in Service Mode.

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 SDM.

⇓	If less than 11 V

5. Vehicle OFF.
6. Test for greater than 25 Ω between the control circuit terminals listed below and ground:

•	Control circuit terminal 1 X1 (stage 1)

•	Control circuit terminal 2 X1 (stage 1)

•	Control circuit terminal 1 X2 (stage 2)

•	Control circuit terminal 2 X2 (stage 2)

⇒	If 25 Ω or less

6.1.	Disconnect the harness connector at the K36 SDM.

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

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

⇒	If infinite resistance, replace the K36 SDM.

⇓	If greater than 25 Ω

7. Install a 3 A fused jumper wire between the control circuit terminals 1 X1 and 2 X1 (Stage 1) or terminals 1 X2 and 2 X2 (Stage 2).
8. Vehicle in Service Mode, 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 airbag coil.

⇒	If 2 Ω or greater

8.1.	Vehicle OFF, disconnect the harness connector X1 at the K36 SDM.

8.2.	Test for less than 2 Ω in the driver steering wheel airbag 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 SDM.

⇓	If less than 2 Ω

9. Replace the F107 driver steering wheel air bag.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.