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B0038




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 04
- Driver Seat Side Air Bag Deployment Loop Open

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 04
- Passenger Seat Side Air Bag Deployment Loop Open

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 (SDM) 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 04, B0021 04

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 ohms for 2 seconds.

B0014 0E, B0021 0E

The air bag deployment loop resistance is less than 1.4 ohms 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 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 right seat air bags

* Left and right roof rail air bags

* Inline harness connector

* 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. 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 Fuel Pump and Level Sensor Assembly

Description and Operation

SIR System Description and Operation Description and Operation

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 Verification

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 air bag

* Roof rail air bag

* SDM

* All wiring harness connectors

* SDM wiring harness connector

Note: 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. Verify the appropriate scan tool Deployment Loop Resistance parameters stay consistently between 2.1 and 4.0 ohms without any spikes or dropouts while moving the harness near each connector.

* F106 seat air bag

* Any inline harness connector

* K36 SDM

• If less than 2.1 or greater than 4.0 ohms
Refer to Circuit/System Testing.

• If there are spikes or dropouts, perform the following

* Inspect each connector terminal and harness for damage or corrosion and repair as necessary

* Apply dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to each connector terminal

* Insure each connector and CPA is correctly seated.

• If within 2.1 and 4.0 ohms without any spikes or dropouts

2. All OK

Circuit/System Testing

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

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

• If 25 ohms or less

1. Disconnect the X2 harness connector at the K36 SDM.

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 SDM.

• If greater than 25 ohms

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

1. Ignition OFF, disconnect the X2 harness connector at the K36 SDM, ignition ON.

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. Ignition OFF.

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

* Control circuit terminal 1

* Control circuit terminal 2

• If 25 ohms or less

1. Disconnect the X2 harness connector at the K36 SDM.

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 ohms

7. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminals 1 and 2.

8. Ignition ON, verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms.

• If 2 ohms or greater

1. Ignition OFF, disconnect the X2 harness connector at the K36 SDM.

2. Test for less than 2 ohms in each control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K36 SDM.

• If less than 2 ohms

9. Ignition OFF, connect the harness connector at the F106 side air bag, press in the CPA (if equipped) until an audible and/or tactile click is heard.

10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

11. Verify DTC B0014, B0021, B0031, or B0038 is not set.

• If DTC B0014, B0021, B0031, or B0038 is set
Replace the appropriate F106 side air bag.

• If DTC B0014, B0021, B0031, or B0038 is not set

12. 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 SDM replacement, programming and setup

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