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

      Hyundai Airbag/SRS Diagnostic Trouble Codes (DTCs): Comprehensive Troubleshooting Guide

      When the airbag warning light illuminates in a Hyundai vehicle, it indicates a potential issue with the Supplemental Restraint System (SRS). Understanding the specific Diagnostic Trouble Codes (DTCs) is essential for effective troubleshooting and repair. This guide provides detailed information on common Hyundai SRS/Airbag DTC codes related to the airbag control module—also known as the Airbag Control Unit (ACU)—airbags, seat belts, impact sensors, and pyrotechnic fuses. Components that MyAirbags can rebuild or service are highlighted to assist you in efficient and cost-effective repairs.

      Understanding Hyundai's SRS/Airbag System

      Hyundai vehicles are equipped with advanced SRS/Airbag systems designed to enhance occupant safety. These systems include multiple sensors, the Airbag Control Unit (ACU), airbags, and seat belt components that must function correctly. Faults in any of these components can trigger DTCs and illuminate the airbag warning light.

      Common Airbag Control Unit (ACU) Faults

      B1100 – Airbag Control Unit Fault

      • Description: Indicates an internal malfunction within the Airbag Control Unit.
      • Possible Causes: Software corruption, hardware failure, moisture intrusion.
      • Solution: MyAirbags can reset and repair the Airbag Control Unit, restoring it to proper working condition.

      B1101 – ACU Configuration Error

      • Description: Configuration error detected in the Airbag Control Unit.
      • Possible Causes: Incorrect module programming, software issues, internal faults.
      • Solution: MyAirbags can reprogram and reset the Airbag Control Unit, correcting configuration errors.

      Airbag Deployment Circuit Faults

      B1331 – Driver Airbag Resistance High

      • Description: High resistance detected in the driver's airbag circuit.
      • Possible Causes: Damaged wiring, faulty clock spring, poor electrical connections, defective airbag module.
      • Note: Airbag modules must be replaced; they cannot be repaired.

      B1332 – Driver Airbag Resistance Low

      • Description: Low resistance detected in the driver's airbag circuit.
      • Possible Causes: Shorted wiring, connector problems, defective airbag module.
      • Note: Replacement of the airbag module is required for safety.

      B1346 – Passenger Airbag Resistance High

      • Description: High resistance detected in the passenger's airbag circuit.
      • Possible Causes: Wiring issues, connector problems, faulty passenger airbag module.
      • Note: Airbag modules need to be replaced; they are not serviceable.

      B1347 – Passenger Airbag Resistance Low

      • Description: Low resistance detected in the passenger's airbag circuit.
      • Possible Causes: Shorted wiring, connector issues, defective airbag module.
      • Note: Replacement of the airbag module is necessary.

      Seat Belt Pretensioner Faults

      B1481 – Driver Seat Belt Pretensioner Resistance High

      • Description: High resistance in the driver's seat belt pretensioner circuit.
      • Possible Causes: Damaged pretensioner, faulty wiring, connector issues.
      • Solution: MyAirbags can rebuild and repair seat belt pretensioners, restoring them to functional condition.

      B1485 – Driver Seat Belt Pretensioner Resistance Low

      • Description: Low resistance in the driver's seat belt pretensioner circuit.
      • Possible Causes: Shorted wiring, internal pretensioner fault.
      • Solution: MyAirbags can rebuild and repair seat belt pretensioners, resolving electrical issues.

      B1491 – Passenger Seat Belt Pretensioner Resistance High

      • Description: High resistance in the passenger's seat belt pretensioner circuit.
      • Possible Causes: Similar issues as the driver's side pretensioner.
      • Solution: MyAirbags can rebuild and repair passenger seat belt pretensioners, ensuring proper operation.

      B1495 – Passenger Seat Belt Pretensioner Resistance Low

      • Description: Low resistance in the passenger's seat belt pretensioner circuit.
      • Possible Causes: Wiring shorts, connector problems, internal pretensioner fault.
      • Solution: MyAirbags can rebuild and repair seat belt pretensioners, fixing electrical faults.

      Impact Sensor Issues

      B1610 – Front Impact Sensor Fault

      • Description: Faulty signal from the front impact sensor(s).
      • Possible Causes: Sensor damage due to collision, wiring problems, faulty connections.
      • Recommendation: Impact sensors typically need to be replaced; repair is not recommended.

      B1615 – Side Impact Sensor (Driver Side) Fault

      • Description: Faulty signal from the driver's side impact sensor.
      • Possible Causes: Similar issues as the front impact sensor.
      • Recommendation: Replace the faulty sensor to ensure proper SRS functionality.

      B1620 – Side Impact Sensor (Passenger Side) Fault

      • Description: Faulty signal from the passenger's side impact sensor.
      • Possible Causes: Sensor damage, wiring issues, mounting problems.
      • Recommendation: Replacement of the sensor is necessary for safety.

      Pyrotechnic Battery Disconnect (Pyro Fuse) Faults

      B1684 – Battery Voltage Low

      • Description: Low voltage detected in the SRS system.
      • Possible Causes: Faulty pyrofuse, battery issues, wiring problems.
      • Solution: MyAirbags can repair or replace the pyrotechnic battery fuse, ensuring the SRS has a proper power supply.

      B1688 – Battery Voltage High

      • Description: High voltage detected in the SRS system.
      • Possible Causes: Charging system issues, faulty pyrofuse, wiring problems.
      • Solution: MyAirbags can service the pyrotechnic battery fuse, restoring correct voltage levels.

      Additional Common Faults

      B1764 – Occupant Classification System (OCS) Malfunction

      • Description: Issues with the system that detects passenger presence and weight.
      • Possible Causes: Damaged OCS sensor, faulty wiring, connector issues.
      • Recommendation: May require sensor replacement or professional calibration; consult a specialist.

      U0001 – High-Speed CAN Communication Bus Fault

      • Description: Communication failure between the Airbag Control Unit and other vehicle systems.
      • Possible Causes: Faulty control module, network communication issues, damaged wiring.
      • Solution: MyAirbags can repair or reset the Airbag Control Unit, restoring communication.

      Troubleshooting and Repair Tips

      • Professional Diagnostics: Use Hyundai-compatible diagnostic tools to accurately read and interpret SRS fault codes.
      • Visual Inspection: Examine wiring harnesses, connectors, and components for damage, corrosion, or disconnections.
      • Safety First: Disconnect the battery and wait at least 3 minutes before working on SRS components to prevent accidental airbag deployment.
      • OEM Parts: Replace non-repairable components with genuine Hyundai parts to maintain system integrity.
      • Consult Experts: Seek professional assistance for complex issues or if unsure about repair procedures.

      Recommendations for Salvage Rebuilders

      1. Accurate Diagnostics

        • Utilize professional-grade diagnostic equipment to identify all stored DTCs and understand the underlying issues.

      2. Use Professional Repair Services

        • For components like the Airbag Control Unit and seat belt pretensioners, consider using MyAirbags to ensure they meet OEM specifications and safety requirements.

      3. Regulatory Compliance

        • Ensure all repairs comply with local and federal safety regulations, including those set by the National Highway Traffic Safety Administration (NHTSA), to guarantee the vehicle's roadworthiness.

      4. Detailed Documentation

        • Maintain comprehensive records of diagnostics, repairs, parts used, and services performed for transparency, legal compliance, and future reference.

      5. Continuous Education

        • Stay informed about Hyundai service bulletins, safety recalls, and updates related to the SRS/Airbag system to enhance repair quality and safety.

      Disclaimer

      The codes listed above are generalized and may vary depending on the specific model and year of the Hyundai vehicle. For precise diagnostics, always refer to the manufacturer's service information or use a professional-grade diagnostic scanner. MyAirbags can help repair and reset specific SRS components, but always ensure that repairs are performed by qualified professionals to maintain vehicle safety and compliance with regulations.

      By understanding these common DTCs and knowing which components can be repaired or need replacement, you can effectively troubleshoot and resolve SRS issues in Hyundai 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.