B1709 – Seat Driver Front Up Switch Circuit Failure

The ODBII code B1709 indicates a malfunction in the driver front seat up switch circuit, which may involve issues with the switch itself, wiring, or the seat control module.

The severity of ODBII code B1709 is generally considered moderate.

Common Causes For: B1708 Seat Driver Recline Rearward Switch Circuit Short To Ground

• Faulty driver front seat up switch
• Damaged wiring or connectors in the seat switch circuit
• Short circuit in the seat switch circuit
• Open circuit in the seat switch circuit
• Malfunctioning power seat motor
• Issues with the body control module (BCM)
• Corrosion or poor connections in the electrical system

Common misdiagnosis for B1709 Seat Driver Front Up Switch Circuit Failure

• Faulty seat switch
• Wiring issues or shorts in the circuit
• Faulty seat control module
• Issues with the body control module (BCM)
• Problems with the power supply to the seat switch
• Incorrectly diagnosed seat motor failure
• Misinterpretation of related codes or symptoms

Common Troubleshooting Steps

The OBD-II code B1709 indicates a problem with the driver’s front seat up switch circuit. This code is typically associated with issues in the seat adjustment system, which can affect the functionality of the seat’s up/down movement. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Visual Inspection: **Wiring and Connectors: Check the wiring harness and connectors associated with the driver’s seat adjustment switch. Look for any signs of damage, fraying, or corrosion.
• **Switch Condition: Inspect the seat switch for any physical damage or wear. Ensure that it is securely connected.
• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Test the Seat Switch: **Multimeter Test: Use a multimeter to test the seat switch for continuity. When the switch is pressed, it should show continuity. If it does not, the switch may be faulty and require replacement.
• **Functionality Test: If possible, manually operate the switch to see if the seat moves up or down. If it does not respond, the switch may be defective.
• Inspect the Seat Motor: **Motor Functionality: Check the seat motor by applying direct power to it (if safe to do so) to see if it operates. If the motor does not work, it may need to be replaced.
• **Wiring to Motor: Inspect the wiring leading to the seat motor for any damage or disconnections.
• Check for Ground Issues: Ensure that the ground connections for the seat adjustment system are secure and free of corrosion. A poor ground can cause circuit failures.
• Scan for Module Issues: If the vehicle has a body control module (BCM) or a seat control module, check for any faults in these modules. They may need to be reprogrammed or replaced if they are malfunctioning.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the seat adjustment system.
• Professional Diagnosis: If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1709 code.