WOMS
B code body Medium severity

B1729 Seat Driver Rear Down Switch Circuit Failure

The OBD2 code B1729 indicates a malfunction in the driver rear seat down switch circuit, suggesting a failure in the electrical circuit or the switch itself that controls the downward movement of the rear driver seat

Definition

The OBD2 code B1729 indicates a malfunction in the driver rear seat down switch circuit, suggesting a failure in the electrical circuit or the switch itself that controls the downward movement of the rear driver seat

Common causes

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

Common misdiagnoses

  • Faulty seat switch
  • Wiring issues
  • Faulty seat motor
  • Body control module (BCM) failure
  • Connector problems
  • Grounding issues
  • Faulty power supply to the seat system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring harness and connectors associated with the driver rear seat down switch. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to any areas where the wiring may be pinched or exposed to moisture

  4. 4. Test the Switch

    Remove the switch from the vehicle and test it with a multimeter. Check for continuity when the switch is activated. If the switch is faulty, it will need to be replaced

  5. 5. Check the Power and Ground

    Use a multimeter to check for power and ground at the switch connector. Ensure that the switch is receiving the correct voltage and that the ground is solid

  6. 6. If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts

  7. 7. Inspect the Seat Motor

    If the switch and wiring are functioning correctly, the issue may lie with the seat motor itself. Test the motor to ensure it is operational. You can do this by applying direct power to the motor to see if it moves

  8. 8. Check for Short Circuits

    Inspect the circuit for any short circuits that may be causing the failure. This can include checking for damaged insulation or pinched wires

  9. 9. Look for Module Issues

    In some vehicles, the seat control may be managed by a body control module (BCM) or similar. If all else checks out, consider testing or replacing the module

  10. 10. Clear Codes and Test Drive

    After performing repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  11. 11. Consult the Service Manual

    If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the B1729 code. This may provide additional insights or steps tailored to your vehicle model

  12. 12. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and address the cause of the B1729 code