B1674 – Seat Driver Occupied Input Circuit Short To Battery

The ODBII code B1674 indicates a fault in the driver seat occupancy sensor circuit, specifically that there is a short circuit to the battery, which may prevent the system from correctly detecting whether the driver seat is occupied.

The severity of ODBII code B1674 is moderate.

Common Causes For: B1673 Seat Driver Occupied Input Circuit Open

• Shorted wiring or connectors in the seat occupancy sensor circuit.
• Faulty seat occupancy sensor.
• Damaged or corroded connectors.
• Malfunctioning airbag control module.
• Improper installation or modifications to the seat or wiring.
• Grounding issues in the circuit.

Common misdiagnosis for B1674 Seat Driver Occupied Input Circuit Short To Battery

• Faulty seat occupancy sensor
• Wiring issues or shorts in the harness
• Malfunctioning airbag control module
• Defective seat control module
• Incorrectly installed or damaged seat
• Issues with the vehicle’s body control module (BCM)
• Faulty connectors or terminals in the circuit

Common Troubleshooting Steps

When dealing with an OBD-II code B1674, which indicates a “Seat Driver Occupied Input Circuit Short To Battery,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Verify the Code: Use an OBD-II scanner to confirm the presence of the B1674 code.
• Check for any additional codes that may provide more context or related issues.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with the driver’s seat occupancy sensor. Look for signs of damage, fraying, or corrosion.
• **Connector Check: Ensure that all connectors are securely attached and free of dirt or moisture.
• Test the Seat Occupancy Sensor: **Resistance Check: If accessible, measure the resistance of the seat occupancy sensor. Compare the readings to the manufacturer’s specifications.
• **Functionality Test: If possible, test the sensor by applying weight to see if the system responds correctly.
• Check for Short Circuits: **Continuity Test: Use a multimeter to check for continuity in the wiring. Look for any shorts to ground or battery voltage.
• **Voltage Check: With the ignition on, check for voltage at the sensor connector. Ensure it matches the expected voltage as per the vehicle’s service manual.
• Inspect the Airbag System: Since the seat occupancy sensor is often linked to the airbag system, ensure that there are no issues with the airbag module or related components.
• Check for any other airbag-related codes that may indicate a broader issue.
• Check for Ground Issues: Ensure that the ground connections for the seat occupancy sensor and related components are secure and free of corrosion.
• Look for Related Technical Service Bulletins (TSBs): Research if there are any TSBs related to the B1674 code for your specific vehicle make and model. Manufacturers may have known fixes or updates.
• Clear the Code and Test Drive: After performing the checks and repairs, clear the code using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after following the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems.
• Replace Components if Necessary: If the sensor or wiring is found to be faulty, replace the necessary components as per the manufacturer’s specifications. By following these steps, you should be able to identify and resolve the issue related to the B1674 code. Always refer to the vehicle’s service manual for specific details and specifications related to your make and model.