B1729 – Seat Driver Rear Down Switch Circuit Failure

The ODBII 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.

The severity of ODBII code B1729 is generally considered moderate.

Common Causes For: B1728 Seat Driver Rear Up Switch Circuit Short To Ground

• 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 misdiagnosis for B1729 Seat Driver Rear Down Switch Circuit Failure

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

Common Troubleshooting Steps

The OBD-II code B1729 indicates a problem with the driver rear seat down switch circuit. This code is typically associated with vehicles that have power seats and indicates that there is a malfunction in the circuit that controls the down function of the rear driver seat. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• 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.
• 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.
• Pay special attention to any areas where the wiring may be pinched or exposed to moisture.
• 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.
• 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.
• If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.