B1718 – Seat Driver Forward Switch Circuit Open

The ODBII code B1718 indicates that there is an open circuit in the driver’s seat forward switch, meaning the switch is not functioning properly or is disconnected, preventing it from sending signals to the vehicle’s control module.

The severity of ODBII code B1718 is generally considered moderate.

Common Causes For: B1717 Seat Driver Forward Switch Circuit Failure

• Faulty driver seat forward switch
• Damaged wiring or connectors in the circuit
• Poor ground connection
• Open circuit due to a break in the wiring
• Faulty seat control module
• Corrosion at connectors or terminals

Common misdiagnosis for B1718 Seat Driver Forward Switch Circuit Open

• Faulty seat switch
• Wiring issues or shorts
• Faulty seat control module
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed airbag system issues
• Problems with the power supply to the seat switch
• Misinterpretation of related codes or symptoms

Common Troubleshooting Steps

When dealing with an OBD-II code B1718, which indicates a “Seat Driver Forward Switch Circuit Open,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check the Code and Freeze Frame Data: Use an OBD-II scanner to confirm the B1718 code is present.
• Review freeze frame data to understand the conditions under which the code was set.
• Visual Inspection: Inspect the wiring and connectors associated with the driver’s seat switch. Look for:
• Damaged or frayed wires.
• Loose or corroded connectors.
• Signs of wear or moisture intrusion.
• Test the Seat Switch: Remove the seat switch from the vehicle.
• Use a multimeter to test the switch for continuity. Check if the switch is functioning properly when pressed.
• If the switch is faulty, replace it.
• Check for Open Circuits: With the multimeter, check for continuity in the wiring harness leading to the seat switch.
• Look for any breaks or opens in the circuit that could cause the code to trigger.
• Inspect the Seat Module: If applicable, check the seat control module for faults. Ensure it is receiving power and ground.
• If the module is faulty, it may need to be reprogrammed or replaced.
• Check for Short Circuits: Inspect the wiring for any shorts to ground or power that could affect the switch operation.
• Use the multimeter to check for resistance in the circuit.
• Clear the Code and Test Drive: After performing repairs, clear the code 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 switch circuit.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership for further diagnosis.Additional Tips: – Always ensure the vehicle is turned off and the battery is disconnected when working on electrical components to avoid shorts or shocks. – Document any changes made during the troubleshooting process for future reference. By following these steps, you should be able to identify and resolve the issue related to the B1718 code.