B1935 – Air Bag Passenger Inflator Circuit Resistance Low on Squib

The ODBII code B1935 indicates that there is low resistance in the passenger airbag inflator circuit, which may suggest a fault in the squib (the device that ignites the airbag) or its wiring, potentially affecting the airbag’s deployment.

The severity of ODBII code B1935 is typically considered moderate to high.

Common Causes For: B1934 Air Bag Driver Inflator Circuit Resistance Low on Squib

• Faulty passenger airbag inflator
• Damaged or corroded wiring or connectors
• Short circuit in the squib circuit
• Open circuit in the squib circuit
• Faulty airbag control module
• Poor ground connection
• Incorrectly installed airbag module

Common misdiagnosis for B1935 Air Bag Passenger Inflator Circuit Resistance Low on Squib

• Faulty airbag module
• Damaged wiring or connectors
• Defective passenger airbag
• Faulty seat occupancy sensor
• Incorrectly installed airbag system components
• Low battery voltage
• Faulty diagnostic tool readings

Common Troubleshooting Steps

When dealing with an OBD-II code B1935, which indicates a low resistance in the passenger airbag inflator circuit (squib), it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps:

• Safety First:
• Disconnect the vehicle’s battery, specifically the negative terminal, to prevent accidental airbag deployment while working on the system.
• Visual Inspection:
• Inspect the airbag module and wiring harness for any visible damage, such as frayed wires, corrosion, or loose connections.
• Check the connectors for the passenger airbag module to ensure they are securely connected and free of dirt or moisture.
• Check Resistance:
• Use a multimeter to measure the resistance of the airbag squib circuit. The resistance should typically be within the manufacturer’s specified range (usually around 2 to 3 ohms). If the resistance is significantly lower, it indicates a short circuit.
• Inspect the Airbag Module:
• If the resistance is low, the airbag module itself may be faulty. Consider replacing the airbag module if other components check out.
• Check for Short Circuits:
• Inspect the wiring harness for any signs of short circuits. Look for pinched wires or areas where the insulation may have worn away, causing a short to ground.
• Test the Airbag Connector:
• Disconnect the airbag connector and check the resistance again. If the resistance returns to normal, the issue may be with the airbag module. If it remains low, the problem lies within the wiring harness.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Check Ground Connections:
• Ensure that all ground connections related to the airbag system are clean and secure. Poor ground connections can lead to erroneous readings.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the airbag system.
• Clear Codes and Test Drive:
• After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. 1
• Professional Help:
• If the issue persists after following these steps, consider seeking assistance from a professional technician or an automotive specialist with experience in airbag systems. Always remember that working with airbag systems can be dangerous. If you’re not comfortable performing these steps, it’s best to consult a professional.