B1718 — Seat Driver Forward Switch Circuit Open #

Note: The code description may vary depending on the manufacturer. Always refer to your OEM (Original Equipment Manufacturer) documentation for precise wording.

• Seat Driver Forward Switch Circuit Open (Ford, Lincoln, Mazda)
• Driver Seat Forward Adjustment Switch Circuit Open (Toyota, Lexus)
• Front Seat Slide Switch Circuit Open (Nissan, Infiniti)
• Seat Position Adjustment Switch Forward Circuit Open (Honda, Acura)

Summary for code B1718 #

The B1718 diagnostic trouble code (DTC) indicates that the driver’s seat forward adjustment switch circuit is open. In simpler terms, the system has detected a break or interruption in the electrical circuit that controls the movement of the driver’s seat forward. This code is typically stored in the Body Control Module (BCM), which monitors and manages various interior electronic functions. If you’re seeing this code, it generally means that the seat may not move forward as expected. While it’s not a critical safety issue, it can impact comfort and, in some cases, driving ergonomics.

Frequent symptoms for code B1718 #

This code often manifests with obvious comfort or adjustability issues. The most common symptom is the inability to move the driver’s seat forward using the power switch. Sometimes, you may also notice unusual noises or complete loss of seat movement in one direction. In rare cases, a warning light or message may appear on the dashboard.

• Driver’s seat will not move forward when pressing the adjustment switch
• Seat may move backward but not forward
• No sound or response from the seat motor when attempting forward movement
• Possible warning indicator on dash (in some models)
• Seat operates normally in other directions

Probable causes for code B1718 #

The most common reasons for a B1718 code involve electrical issues within the seat adjustment circuit. These can range from simple connection problems to a failed switch or motor. Below is an ordered list of likely culprits, starting with the most frequent:

1. Faulty seat forward adjustment switch (the switch you press to move the seat forward)
2. Broken or disconnected wiring in the seat harness
3. Corroded or loose electrical connectors under the seat
4. Failed seat motor (responsible for moving the seat forward)
5. Blown fuse related to seat adjustment circuits
6. Faulty Body Control Module (BCM) (rare)

Step-by-step diagnosis for code B1718 #

Diagnosing a B1718 code requires a systematic approach to isolate the problem. Start with the simplest checks and move toward more involved procedures only if necessary. Here’s a recommended diagnostic path:

1. Verify the concern: Attempt to move the driver’s seat forward and listen for any motor activity.
2. Inspect fuse(s): Check the relevant fuses for the seat power circuits.
3. Visual inspection: Look for disconnected, pinched, or damaged wires under the driver’s seat.
4. Check connectors: Unplug and replug the seat adjustment switch and seat motor connectors to check for corrosion or loose pins.
5. Test the switch: Use a multimeter to check continuity across the seat forward switch contacts.
6. Test the motor: Apply direct battery voltage to the seat motor to confirm it operates in both directions.
7. Scan for additional codes: Use a scan tool to see if related codes are present, which might indicate a BCM issue.

Possible repairs for code B1718 #

Once you’ve identified the cause, repairs will target the faulty component or connection. The following are common fixes, each corresponding to a potential cause listed above:

• Replace the seat forward adjustment switch if found defective
• Repair or replace damaged wiring in the seat harness
• Clean and secure electrical connectors under the seat
• Replace the seat motor if it fails the direct voltage test
• Replace a blown fuse and investigate the cause of the overload
• Replace or reprogram the Body Control Module (BCM) (only if all other causes are ruled out)

Is it safe to drive with code B1718? #

Yes, you can drive with this code, but with limitations: The B1718 code does not directly affect the safety or drivability of your vehicle. However, if you cannot adjust the driver’s seat to a comfortable or safe position, it can reduce control or cause discomfort on longer journeys. For shared vehicles or situations where different drivers need to adjust the seat, prompt repair is recommended.

Vehicles most affected by code B1718 #

While this code can appear on a wide range of vehicles, it is most commonly reported on models with power-adjustable seats from the following brands:

• Ford (F-150, Explorer, Fusion, Taurus)
• Lincoln (MKZ, Navigator, MKT)
• Mazda (Mazda6, CX-9)
• Toyota (Camry, Avalon, Highlander)
• Lexus (ES, RX, LS)
• Nissan (Altima, Maxima, Murano)
• Honda (Accord, Odyssey, Pilot)
• Acura (MDX, TLX)

Common mistakes & best practices for code B1718 #

Misdiagnosis often leads to unnecessary parts replacement or missed simple fixes. To avoid frustration and wasted expense, keep these best practices in mind:

• Don’t replace the seat motor before checking wiring and switch continuity — wiring faults are more common than failed motors.
• Always disconnect the battery before working with seat wiring to prevent airbag system issues or accidental deployment (many vehicles have seat-mounted airbags).
• Use a scan tool to clear the code after repairs and verify seat operation before closing up trims or covers.
• Document connector pinouts and wire colors before disconnecting multiple harnesses.

Express FAQ for code B1718 #

Here are quick answers to some common questions about this code:

• Q: Can B1718 be triggered by a dead battery or jump start?
  A: Rarely. While low voltage events can sometimes create false codes, B1718 usually points to a real circuit problem.
• Q: Is this repair covered under warranty?
  A: If your vehicle is still under basic or power seat warranty, the repair is often covered. Check with your dealer for specifics.