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B1757Seat Driver Rear Down Circuit Failure

The OBD2 code B1757 indicates a malfunction in the driver rear seat's down adjustment circuit, suggesting a failure in the electrical system responsible for lowering that seat

Definition

The OBD2 code B1757 indicates a malfunction in the driver rear seat's down adjustment circuit, suggesting a failure in the electrical system responsible for lowering that seat

Common causes

  • Faulty seat motor
  • Damaged wiring or connectors
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Faulty seat switch
  • Malfunctioning body control module (BCM)
  • Corrosion or poor connections in the circuit

Common misdiagnoses

  • Faulty seat motor
  • Wiring issues or shorts
  • Bad seat switch
  • Faulty body control module (BCM)
  • Poor ground connection
  • Corroded connectors
  • Malfunctioning power supply to the seat
  • Incorrectly installed seat or components

Troubleshooting steps

  1. 1.Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2.Inspect the Seat Wiring and Connectors

    Visual Inspection: Look for any visible damage to the wiring harness, connectors, or terminals associated with the seat adjustment mechanism

  3. 3.Loose Connections

    Ensure that all connectors are securely attached and free of corrosion or dirt

  4. 4.Test the Seat Switch

    Functionality Check: Test the seat switch that controls the rear down movement. Use a multimeter to check for continuity when the switch is activated

  5. 5.Replace if Necessary

    If the switch is faulty, it may need to be replaced

  6. 6.Check the Power Supply

    Voltage Test: Use a multimeter to check for proper voltage at the seat motor connector when the switch is activated. Ensure that the seat is receiving power

  7. 7.Fuses

    Check the relevant fuses in the fuse box that control the seat functions. Replace any blown fuses

  8. 8.Inspect the Seat Motor

    Motor Functionality: If the switch and wiring are functioning correctly, the issue may lie with the seat motor itself. Test the motor by applying direct power to it to see if it operates

  9. 9.Replace if Faulty

    If the motor does not work when powered directly, it may need to be replaced

  10. 10.Check for Ground Issues

    Ensure that the seat motor has a good ground connection. A poor ground can cause the motor to malfunction

  11. 11.Look for Obstructions

    Inspect the seat tracks and mechanisms for any obstructions that may prevent the seat from moving down

  12. 12.Reset the System

    After performing repairs, clear the trouble codes using the OBD-II scanner and test the seat function again to see if the code returns

  13. 13.Consult the Service Manual

    If the issue persists, refer to the vehicle's service manual for specific diagnostic procedures and wiring diagrams related to the seat adjustment system

  14. 14.Seek Professional Help

    If you are unable to resolve the issue after these steps, consider consulting a professional mechanic or an automotive technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and potentially resolve the issue related to the B1757 code