Air Bag Sys. - DTC's B0014 04/B0014 OD/B0021 04/B0021 OD

TECHNICAL

Bulletin No.: 11-09-41-003B

Date: September 27, 2011

Subject: Diagnosing Air Bag Indicator Illuminating Intermittently, DTC B0014 04, B0014 0D, B0021 04, B0021 0D, B001A 04, B001A 0D, B001B 04 or B001B 0D Set

Models:
2011-2012 Chevrolet Volt

Supercede:
This bulletin is being revised to add the 2012 model year and four additional DTCs to the Subject, Condition and Correction information. Please discard Corporate Bulletin Number 11-09-41-003A (Section 09 - Restraints).

Condition

In rare cases, some customers may comment on the air bag indicator illuminating intermittently.

Upon further inspection, the technician may observe on a scan tool one or more of the following DTCs set:

- DTC B0014 04: Driver Seat Side Air Bag Deployment Loop Open

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

- DTC B001A 04: Driver Seat Belt Anchor Pretensioner Deployment Loop Open

- DTC B001A 0D: Driver Seat Belt Anchor Pretensioner Deployment Loop High Resistance

- DTC B001B 04: Passenger Seat Belt Anchor Pretensioner Deployment Loop Open

- DTC B001B 0D: Passenger Seat Belt Anchor Pretensioner Deployment Loop High Resistance

- DTC B0021 04: Passenger Seat Side Air Bag Deployment Loop Open

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

Cause

This condition may be caused by the sensing and diagnostic module (SDM) monitoring a brief increase in the resistance of any of the following:

- The driver seat side air bag or passenger seat side air bag deployment loop circuits.

- The driver seat belt anchor pretensioner or passenger seat belt anchor pretensioner deployment loop circuits.

The increased resistance may be caused by intermittent conditions and poor connections anywhere in these deployment loop circuits. This includes the wiring and the connectors in the vehicle body and the seat.

Correction

Properly identifying the part or parts of the affected circuits that are causing the brief increase in the resistance is critical PRIOR to attempting any repairs. The identification of the problem area is also critical to ensure that the repair work is effective.

In many of these rare cases, the condition is intermittent and dependent on many variables, including but not limited to:

- The forward position of the seat.

- The rearward position of the seat.

- The reclining position of the seat.

- The height position of the seat.

- Improper routing of a harness.

- Connectors that are not fully seated.

- Poor crimps on the terminals.

- Poor tension between the terminals.

- Damaged wiring beneath the protective conduit.

- Damaged wiring beneath the electrical tape.

- Intermittent Conditions and Poor Connections at the connectors.

- Intermittent Conditions and Poor Connections at the terminals within the connectors.

1. Connect a scan tool to the vehicle.

2. Turn ON the ignition.

3. Build the vehicle on the scan tool.
Then navigate to: Diagnostics > SIR Module > DTC Information.

4. Observe the DTC Information. Are DTC B0014 04, B0014 0D, B0021 04, B0021 0D, B001A 04, B001A 0D, B001B 04 or B001B 0D set as Failed Current DTC, Passed and Failed or History?

• If DTC B0014 04, B0014 0D, B001A 04, or B001A 0D are set as Failed Current DTC, Passed and Failed or History, the driver seat side air bag or seat belt anchor pretensioner is affected. Proceed to Step 5.

• If DTC B0021 04, B0021 0D, B001B 04 or B001B 0D are set as Failed Current DTC, Passed and Failed or History, the passenger seat side air bag or seat belt anchor pretensioner is affected. Proceed to Step 6.

5. On the scan tool, navigate to: SIR Module > Data Display > Deployment Loop 1-14 Resistance Data. Select the appropriate Driver Deployment Loop parameter for the DTC and symptom byte that is set. Proceed to Step 7.

6. On the scan tool, navigate to: SIR Module > Data Display > Deployment Loop 1-14 Resistance Data. Select the appropriate Passenger Deployment Loop parameter for the DTC and symptom byte that is set. Proceed to Step 7.

7. On the scan tool, observe the appropriate Deployment Loop parameter.

Important
When performing the following actions, the Deployment Loop Resistance parameter MUST remain less than 3.5 Ω at all times.

1. Manipulate and wiggle ALL of the wiring harnesses and connectors for the affected air bag or pretensioner Deployment Loop circuits as follows:

2. The vehicle wiring harnesses

3. The seat harnesses

4. The seat jumper harness

5. All associated vehicle harness connectors

6. All associated seat harness connectors

• If the Deployment Loop Resistance parameter is more than 3.5 Ω, repair as needed. Refer to SI.

• If the Deployment Loop Resistance parameter remains less than 3.5 Ω at all times, proceed to Step 8.

8. FULLY change the position of the seat both ways and FULLY change the position of the seat recliner both ways and perform the following each time:

Important
When performing the following actions, the Deployment Loop Resistance parameter MUST remain less than 3.5 Ω at all times.

1. Manipulate and wiggle ALL of the wiring harnesses and connectors for the affected air bag or pretensioner Deployment Loop circuits as follows.

2. The vehicle wiring harnesses

3. The seat harnesses

4. The seat jumper harness

5. All associated vehicle harness connectors

6. All associated seat harness connectors

• If the Deployment Loop Resistance parameter is more than 3.5 Ω, repair as needed. Refer to SI.

• If the cause of the condition is not identified, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI.





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