Troubleshooting
      Back to home
      1. MyAirbags FAQ's
      2. Airbag Module Reset
      3. Troubleshooting

      When troubleshooting an open circuit code, what can I check?

      ** May vary by vehicle.
      An open circuit code after resetting an SRS (Supplemental Restraint System) module typically indicates an issue with the wiring or connection within the SRS system. This could involve seat belts, airbags, or other related components. Here’s how you can troubleshoot and resolve the issue:
       
      Step-by-Step Troubleshooting Guide
      1. Identify the Specific Circuit
      • Use a scan tool or diagnostic device to pinpoint the specific code (e.g., B0100, B0012). Each code usually corresponds to a particular component like a driver-side airbag or a seatbelt pretensioner.
      • Knowing which component has the issue will help you narrow down your inspection.
      2. Visual Inspection
      • Check Connectors: Inspect all related connectors for damage, corrosion, or loose connections. Ensure they are properly seated.
      • Examine Wiring Harnesses: Look for any signs of wear, fraying, or pinching along the wiring harnesses. Pay special attention to areas around seats or other parts that move, as they’re prone to damage.
      • Airbag or Seat Belt Tensioner Connections: Verify that all airbag and seat belt tensioner connectors are properly connected.
      3. Check for Pin Tension and Corrosion
      • Use a pin-tension tester or a multimeter to check for loose pins at the connector. Loose pins can lead to poor contact and open circuits.
      • Look for any signs of corrosion in connectors, which can disrupt the signal path.
      4. Measure Continuity
      • With the battery disconnected and the SRS module removed, use a multimeter to check continuity across the affected circuit. There should be little to no resistance in a properly functioning circuit.
      • If you find an open circuit (infinite resistance), track it down by checking different segments of the wiring harness until you isolate the faulty section.
      5. Check Clock Spring (if applicable)
      • If the open circuit code is related to a driver or passenger airbag, inspect the clock spring. The clock spring provides electrical continuity to the steering wheel airbag and can wear out over time, leading to an open circuit.
      • Test the clock spring with a multimeter to ensure proper continuity.
      6. Inspect Airbag or Seat Belt Pretensioner Resistance
      • Check the resistance of the airbag or seatbelt pretensioner in question. Most SRS components have a resistance range of around 2-3 ohms.
      • If the resistance is too high or too low, there may be a defect in the component itself.
      7. Module Compatibility
      • Ensure that the reset SRS module is compatible with the vehicle and its components. In some cases, a mismatch can cause open circuit codes.
      • If you swapped out an SRS module, confirm that it’s programmed correctly for your vehicle’s configuration.
      8. Replace Faulty Components or Wiring
      • If you find a damaged wire, repair or replace that section of the harness.
      • If a component shows abnormal resistance or fails continuity tests, replace it.
      9. Clear the Code and Test
      • After repairing the open circuit, reconnect the SRS module, clear the codes, and test the system.
      • If the code persists, recheck all connections and wiring.
       
      Additional Tips:
      • Use a Factory Service Manual: Always refer to your vehicle’s factory service manual for detailed wiring diagrams and component specifications.
      • Avoid Probing Connectors Directly: When measuring continuity, use approved back-probing methods or terminal testing tools to avoid damaging connectors.
       
      If the issue remains unresolved, it may be necessary to send the module or affected components back to MyAirbags for further testing or repair.