DTC Codes
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      Infiniti SRS (Supplemental Restraint System)/Airbag Diagnostic Trouble Codes (DTCs)

      Comprehensive Guide to Infiniti Airbag/SRS Diagnostic Trouble Codes (DTCs) and Troubleshooting

      When the airbag warning light illuminates in your Infiniti vehicle, it signifies a potential issue with the Supplemental Restraint System (SRS). This guide provides an in-depth look at common Infiniti SRS/Airbag DTC codes, troubleshooting steps, and repair solutions. We also include additional information on related systems to assist you in effectively diagnosing and resolving SRS issues.

      Understanding Infiniti's SRS/Airbag System

      Infiniti's SRS/Airbag system is designed to enhance occupant safety by deploying airbags and tightening seat belts in the event of a collision. The system comprises various components:

      • Airbag Control Unit (ACU): Also known as the Airbag Control Module, it monitors the SRS system and controls airbag deployment.
      • Airbags: Front, side, curtain, and knee airbags protect occupants during a crash.
      • Seat Belt Pretensioners: Tighten the seat belts to secure occupants.
      • Impact Sensors: Detect collisions and provide input to the ACU.
      • Occupant Classification System (OCS): Determines the presence and weight of the front passenger to control airbag deployment.

      Common Infiniti SRS/Airbag DTC Codes

      Below is a table summarizing common DTC codes, their descriptions, possible causes, and solutions. Components that MyAirbags can rebuild or service are highlighted.

      DTC Code Description Possible Causes Solution
      B1049 Driver Airbag Module Open Circuit Faulty clock spring, damaged wiring, poor connections, defective airbag Replace airbag module; cannot be repaired
      B1054 Passenger Airbag Module Open Circuit Wiring issues, connector problems, faulty passenger airbag module Replace airbag module; cannot be repaired
      B1134 Airbag Control Unit Internal Fault Software corruption, hardware failure, moisture intrusion MyAirbags can reset and repair the ACU
      B1209 Driver Seat Belt Pretensioner Circuit Fault Damaged pretensioner, faulty wiring, connector issues MyAirbags can rebuild and repair pretensioner
      B1210 Passenger Seat Belt Pretensioner Circuit Fault Similar issues as driver's side pretensioner MyAirbags can rebuild and repair pretensioner
      B1129 Front Impact Sensor Fault Sensor damage, wiring problems, faulty connections Replace sensor; repair wiring if needed
      B1145 Side Impact Sensor (Left) Fault Sensor damage, wiring issues, mounting problems Replace sensor; check wiring and mounting
      B1146 Side Impact Sensor (Right) Fault Similar issues as left side impact sensor Replace sensor; check wiring and mounting
      B1421 OCS Control Unit Fault Faulty OCS sensor, wiring issues, calibration needed Calibrate or replace OCS; consult specialist
      U1000 CAN Communication Line Fault Faulty control module, network communication issues, damaged wiring Diagnose network; repair wiring; reset modules

      Troubleshooting Steps

      1. Retrieve DTC Codes

      • Use Infiniti CONSULT Diagnostic Tool: Connect the CONSULT tool to the vehicle's OBD-II port to read stored DTCs accurately.

      2. Visual Inspection

      • Check Wiring and Connectors: Look for damaged wires, loose connectors, corrosion, or signs of previous repairs.
      • Inspect Sensors and Modules: Ensure that sensors are properly mounted and modules are secure.

      3. Test Components

      • Airbag Modules and Pretensioners: Do not attempt to repair airbags; they must be replaced if faulty.
      • Impact Sensors: Test using manufacturer procedures; replace if faulty.
      • Seat Belt Pretensioners: MyAirbags can rebuild and repair these components.

      4. Check for Recalls and Service Bulletins

      • Infiniti Service Information: Review any Technical Service Bulletins (TSBs) or recalls related to the SRS system.

      5. Clear Codes and Test Drive

      • Reset the SRS System: After repairs, clear the DTCs using the diagnostic tool.
      • Verify Repair: Test drive the vehicle to ensure the airbag warning light remains off.

      Additional SRS/Airbag Troubleshooting Information

      Occupant Classification System (OCS) Issues

      • Symptoms: Airbag warning light on; DTC B1421.
      • Causes: Faulty OCS sensor mat, incorrect seat installation, aftermarket seat covers.
      • Solutions:
        • Calibration: Perform OCS re-zeroing procedure using CONSULT.
        • Replacement: If calibration fails, replace the OCS sensor mat.
        • Note: Professional assistance is recommended.

      Clock Spring (Spiral Cable) Problems

      • Symptoms: Driver airbag circuit faults (B1049), malfunctioning steering wheel controls.
      • Causes: Damaged clock spring due to wear or improper installation.
      • Solutions:
        • Inspection: Check for continuity; replace if faulty.
        • Installation: Ensure correct alignment during installation to prevent damage.

      CAN Communication Issues

      • Symptoms: Multiple DTCs related to communication faults; U1000 code.
      • Causes: Damaged wiring, faulty modules, network issues.
      • Solutions:
        • Network Diagnosis: Use CONSULT to identify communication breakdowns.
        • Wiring Repairs: Repair or replace damaged CAN bus wiring.
        • Module Reset: Re-initialize modules if necessary.

      Safety Precautions

      • Disconnect Battery: Before servicing SRS components, disconnect the negative battery terminal and wait at least 3 minutes.
      • Handle Airbags Carefully: Airbag modules are explosive devices; handle them according to manufacturer guidelines.
      • Avoid Electrical Static Discharge (ESD): Wear ESD protection to prevent damage to electronic components.
      • Professional Training: SRS repairs should be performed by trained technicians.

      Why Choose MyAirbags

      MyAirbags offers professional services to rebuild and reset specific SRS components:

      • Airbag Control Units (ACU): Reset and repair to factory specifications.
      • Seat Belt Pretensioners: Rebuild and repair to ensure proper function.
      • Cost-Effective: Save money compared to purchasing new components.
      • Quality Assurance: Components are restored to meet or exceed OEM standards.

      Recommendations for Salvage Rebuilders

      • Documentation: Keep detailed records of diagnostics, repairs, and parts replaced.
      • Compliance: Ensure all repairs meet safety regulations and standards.
      • Use OEM Parts: When replacing components, use genuine Infiniti parts.
      • Stay Informed: Keep up-to-date with manufacturer service information and training.

       

      Effectively diagnosing and repairing SRS issues in Infiniti vehicles requires a thorough understanding of the system and proper troubleshooting techniques. By following this guide and utilizing professional services like MyAirbags, you can restore the SRS system to its original functionality, ensuring the safety of vehicle occupants.

      Disclaimer

      The information provided is general and may vary depending on the specific model and year of the Infiniti vehicle. Always refer to the manufacturer's service information or consult a qualified professional for accurate diagnostics and repair procedures. MyAirbags can assist with repairing and resetting certain SRS components, but ensure that all repairs comply with safety standards and regulations.

      By understanding these common DTCs and following the recommended troubleshooting steps, you can effectively resolve SRS issues in Infiniti vehicles. Utilizing professional services like MyAirbags not only saves time and money but also ensures that safety systems are restored to their original standards, keeping you and your passengers safe on the road.