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B0031




DTC B0014, B0021, B0031, or B0038

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 B0014 01
- Driver Seat Side Air Bag Deployment Loop Short to Battery

DTC B0014 02
- Driver Seat Side Air Bag Deployment Loop Short to Ground

DTC B0014 08
- Driver Seat Side Air Bag Deployment Loop Signal Invalid

DTC B0014 0D
- Driver Seat Side Air Bag Deployment Loop High Resistance

DTC B0014 0E
- Driver Seat Side Air Bag Deployment Loop Low Resistance

DTC B0021 01
- Passenger Seat Side Air Bag Deployment Loop Short to Battery

DTC B0021 02
- Passenger Seat Side Air Bag Deployment Loop Short to Ground

DTC B0021 08
- Passenger Seat Side Air Bag Deployment Loop Signal Invalid

DTC B0021 0D
- Passenger Seat Side Air Bag Deployment Loop High Resistance

DTC B0021 0E
- Passenger Seat Side Air Bag Deployment Loop Low Resistance

Diagnostic Fault Information






Circuit/System Description

During a side or 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 an air bag. There are 2 shorting bars used within the connector that will short together the control circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the air bag or retractor pretensioner during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0014 01, B0021 01

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

B0014 02, B0021 02

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

B0014 08, B0021 08

The air bag control circuit is open for 2 seconds.

B0014 0D, B0021 0D

The air bag deployment loop resistance is greater than 4.2 ? for 2 seconds.

B0014 0E, B0021 0E

The air bag deployment loop resistance is less than 1.4 ? for 2 seconds.

Action Taken When the DTC Sets

* The inflatable restraint sensing and diagnostic module requests the instrument cluster to illuminate the AIR BAG indicator.

* The inflatable restraint sensing and diagnostic module 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 Aid

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

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:

* Left and rear seat side air bags

* Inline harness connectors

* Harness side of the inflatable restraint sensing and diagnostic module 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. DTCs of deployment loops which are in the seat can occur because of stress or damage to the harness due to seat movement. Move the seat to the full extent of travel while using the scan tool to observe deployment type loop parameters.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

SIR System Description and Operation SIR System

Electrical Information Reference

* Circuit Testing Circuit Testing

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

* Wiring Repairs Wiring Repairs

* Connector Repairs Connector Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

EL-38125-580 - Terminal Release Tool Kit

Circuit/System Testing

Note:

* Refer to SIR Service Precautions Technician Safety Information

* 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.

- Seat belt retractor pretensioner

- Passenger instrument panel air bag

- Seat side air bag

- Roof rail air bag

- Inflatable restraint sensing and diagnostic module

- All wiring harness connectors

- 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 dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.

1. Ignition OFF, disconnect the scan tool and then disconnect the appropriate F106 side air bag. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for greater than 25 ? between the control circuit terminals 1 and 2.

• If 25 ? or less

1. Disconnect the harness connector listed below at the K36 inflatable restraint sensing and diagnostic module:

* DTC B0014 - connector X1

* DTC B0021 - connector X2

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. 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 ?

3. Ignition ON.

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

* F106LF Seat Air Bag - Left Front control circuit terminal 1 X1

* F106LF Seat Air Bag - Left Front control circuit terminal 2 X1

* F106RF Seat Air Bag - Right Front control circuit terminal 1 X1

* F106RF Seat Air Bag - Right Front control circuit terminal 2 X1

• If 11 V or greater
Repair the short to voltage on the circuit.

• If less than 11 V

5. Ignition OFF.

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

* F106LF Seat Air Bag - Left Front control circuit terminal 1 X1

* F106LF Seat Air Bag - Left Front control circuit terminal 2 X1

* F106RF Seat Air Bag - Right Front control circuit terminal 1 X1

* F106RF Seat Air Bag - Right Front control circuit terminal 2 X1

• If 25 ? or less
Repair the short to ground on the circuit.

• If greater than 25 ?

7. Ignition OFF, disconnect the harness connectors at the inflatable restraint sensing and diagnostic module.

8. Test for less than 2 ? between each harness connector terminal listed below end to end:

* F106LF Seat Air Bag - Left Front control circuit terminal 1 X1 and K36 inflatable restraint sensing and diagnostic module 6 X1

* F106LF Seat Air Bag - Left Front control circuit terminal 2 X1 and K36 inflatable restraint sensing and diagnostic module 5 X1

* F106RF Seat Air Bag - Right Front control circuit terminal 1 X1 and K36 inflatable restraint sensing and diagnostic module 5 X2

* F106RF Seat Air Bag - Right Front control circuit terminal 2 X1 and K36 inflatable restraint sensing and diagnostic module 6 X2

• If 2 ? or greater
Repair the open/high resistance in the circuit.

• If less than 2 ?

9. Ignition OFF, connect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.

10. Ignition ON.

11. Clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

12. Verify DTC B0014 or B0021 is not set.

• If DTC B0014 or B0021 is set
Replace the appropriate F106 side air bag.

• If DTC B0014 or B0021 is not set

13. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Driver or Passenger Seat Side Inflatable Restraint Module Replacement Driver or Passenger Seat Side Inflatable Restraint Module Replacement

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

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