B1757 – Seat Driver Rear Down Circuit Failure

The ODBII 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.

The severity of ODBII code B1757 is moderate.

Common Causes For: B1756 Hazard Flash Output Circuit Short To Ground

• 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 misdiagnosis for B1757 Seat Driver Rear Down Circuit Failure

• 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

Common Troubleshooting Steps

The OBD-II code B1757 indicates a “Seat Driver Rear Down Circuit Failure.” This code is typically related to the power seat system in vehicles, specifically the circuit that controls the downward movement of the driver’s rear seat. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• 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.
• 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.
• **Loose Connections: Ensure that all connectors are securely attached and free of corrosion or dirt.
• 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.
• **Replace if Necessary: If the switch is faulty, it may need to be replaced.
• 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.
• **Fuses: Check the relevant fuses in the fuse box that control the seat functions. Replace any blown fuses.
• 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.
• **Replace if Faulty: If the motor does not work when powered directly, it may need to be replaced.
• Check for Ground Issues: Ensure that the seat motor has a good ground connection. A poor ground can cause the motor to malfunction.
• Look for Obstructions: Inspect the seat tracks and mechanisms for any obstructions that may prevent the seat from moving down.
• 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.
• 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.
• 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.