B1673 – Seat Driver Occupied Input Circuit Open

The ODBII code B1673 indicates that there is an open circuit in the driver seat occupancy sensor input, meaning the system is not detecting whether the driver seat is occupied.

The severity of ODBII code B1673 is moderate.

Common Causes For: B1672 Seat Driver Occupied Input Circuit Failure

• Faulty seat occupancy sensor
• Damaged wiring or connectors in the seat occupancy circuit
• Poor ground connection
• Malfunctioning airbag control module
• Corroded or loose connections
• Faulty seat control module
• Disconnected or damaged harnesses

Common misdiagnosis for B1673 Seat Driver Occupied Input Circuit Open

• Faulty seat occupancy sensor
• Wiring issues or shorts in the seat harness
• Malfunctioning airbag control module
• Faulty seat control module
• Issues with the vehicle’s body control module (BCM)
• Problems with the connector or terminals related to the seat sensor
• Incorrectly installed or damaged seat assembly

Common Troubleshooting Steps

When dealing with an OBD-II code B1673, which indicates a “Seat Driver Occupied Input Circuit Open,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check the Basics: **Scan for Codes: Use an OBD-II scanner to confirm the presence of the B1673 code and check for any other related codes that might provide additional context.
• **Clear Codes: Clear the codes and see if the B1673 code returns after a short drive. This can help determine if it’s a persistent issue.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring and connectors associated with the driver’s seat occupancy sensor. Look for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or pushed out.
• Test the Seat Occupancy Sensor: **Sensor Functionality: If the vehicle is equipped with a seat occupancy sensor, test its functionality. This may involve checking the resistance or voltage output of the sensor when the seat is occupied versus unoccupied.
• **Sensor Replacement: If the sensor is faulty, consider replacing it.
• Check for Ground Issues: **Ground Connections: Ensure that the ground connections for the seat occupancy sensor circuit are secure and free of corrosion. A poor ground can lead to an open circuit.
• Inspect the Airbag Module: **Airbag Module Connection: Since the seat occupancy sensor is often tied to the airbag system, check the connections to the airbag module for any issues.
• **Module Functionality: If necessary, test the airbag module to ensure it is functioning correctly.
• Look for Shorts or Opens in the Circuit: **Continuity Testing: Use a multimeter to check for continuity in the wiring between the seat occupancy sensor and the airbag module. Look for any breaks or shorts in the wiring.
• **Resistance Testing: Measure the resistance of the circuit to ensure it is within the manufacturer’s specifications.
• Consult Wiring Diagrams: **Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to understand the circuit layout and identify any other components that may be involved.
• Check for Software Updates: **ECU Updates: In some cases, a software update for the vehicle’s ECU may resolve the issue. Check with the manufacturer or a dealership for any available updates.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle model.Conclusion By following these troubleshooting steps, you should be able to identify the cause of the B1673 code and take appropriate action to resolve it. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle model.