B1765 – Seat Driver Forward Circuit Failure

The ODBII code B1765 indicates a malfunction in the driver’s seat forward circuit, typically related to the seat adjustment mechanism.

The severity of ODBII code B1765 is moderate.

Common Causes For: B1764 Seat Driver Front Down Circuit Short To Ground

• Faulty seat position sensor
• Damaged wiring or connectors
• Short circuit in the seat circuit
• Open circuit in the seat circuit
• Malfunctioning seat control module
• Corrosion or poor connections in the wiring harness
• Faulty power supply to the seat system

Common misdiagnosis for B1765 Seat Driver Forward Circuit Failure

• Faulty seat position sensor
• Wiring issues or shorts in the seat harness
• Malfunctioning seat control module
• Issues with the body control module (BCM)
• Problems with the power seat motor
• Faulty connectors or terminals
• Incorrectly calibrated seat position settings
• General electrical system faults

Common Troubleshooting Steps

The OBD-II code B1765 indicates a “Seat Driver Forward Circuit Failure,” which typically relates to an issue with the power seat’s forward movement function. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check the Owner’s Manual: Refer to the vehicle’s service manual for specific information related to the seat wiring and components.
• Inspect the Seat Wiring:
• Check the wiring harness and connectors under the driver’s seat for any signs of damage, corrosion, or loose connections.
• Look for frayed wires or broken connectors that could interrupt the circuit.
• Test the Seat Switch:
• Use a multimeter to test the seat switch for continuity. If the switch is faulty, it may need to be replaced.
• Ensure that the switch is functioning correctly in all positions (forward, backward, up, down).
• Check the Power Supply:
• Verify that the seat is receiving power. You can do this by checking the voltage at the seat motor connector while attempting to operate the seat.
• If there is no power, trace the wiring back to the fuse box and check for blown fuses or faulty relays.
• Inspect the Seat Motor:
• If the switch and wiring are functioning correctly, the issue may lie with the seat motor itself. Test the motor for proper operation by applying direct power to it.
• If the motor does not operate when powered directly, it may need to be replaced.
• Check for Faulty Modules:
• Some vehicles have a body control module (BCM) that controls the power seat functions. If other components are functioning correctly, the BCM may be at fault.
• Use a scan tool to check for any additional codes that may indicate a problem with the BCM.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the OBD-II codes using a scan tool and take the vehicle for a test drive to see if the code returns.
• Consult a Professional:
• If you are unable to diagnose or fix the issue, it may be best to consult a professional mechanic or an automotive electrician for further assistance. By following these steps, you should be able to identify the cause of the B1765 code and take appropriate action to resolve the issue.