B1665 — Seat Driver Forward/Backward Motor Stalled #

Note: The description for this DTC (Diagnostic Trouble Code) may vary depending on the vehicle manufacturer.

• B1665 — Driver Seat Motor Forward/Backward Stalled (Ford)
• B1665 — Seat Driver Adjuster Motor Forward/Backward Stalled (Nissan)
• B1665 — Seat Track Motor Stalled (Toyota)

Summary of the B1665 Code #

The B1665 code indicates that the motor responsible for moving the driver’s seat forward and backward has stalled, meaning it is not operating as expected. This code is stored when the seat control module, which is the vehicle’s computer for seat adjustments, detects that the seat motor has drawn too much current or has stopped moving while being commanded. This is a safety and comfort feature: it prevents potential damage to the seat mechanism and ensures the driver’s position can be adjusted as needed. While this code does not typically affect the driveability of the vehicle, it can impact comfort and accessibility, especially if multiple drivers use the vehicle. The code may be accompanied by warning lights or messages on the dashboard, depending on the OEM (Original Equipment Manufacturer).

Common Symptoms for B1665 #

The most obvious sign of a B1665 code is the driver’s seat failing to move forward or backward when using the seat adjustment switches. Sometimes, you may hear a clicking sound, feel the motor straining, or notice partial movement before the seat stops completely. In some vehicles, there may also be a related warning message or indicator light on the dashboard.

• Driver’s seat does not move forward or backward
• Unusual noises (clicking, grinding, or humming) from under the seat
• Partial or jerky seat movement
• Seat stops mid-travel and does not respond to switches
• Dashboard seat adjustment warning message (on certain models)

Probable Causes for B1665 (Most to Least Common) #

Several issues can trigger the B1665 code, ranging from mechanical obstructions to electrical failures. Understanding the probable causes helps prioritize the diagnostic process and avoid unnecessary part replacements.

1. Obstruction in seat track (e.g., debris, coins, objects blocking movement)
2. Faulty seat forward/backward motor (worn out or internally seized motor)
3. Wiring issues (damaged, loose, or corroded connectors and wires at the seat motor or control module)
4. Seat adjustment switch malfunction (defective or sticking switch)
5. Faulty seat control module (rare, but possible if other seat functions fail too)
6. Blown fuse or relay (if seat motor circuit is protected by one, depending on OEM design)

Step-by-Step Diagnostic Procedure for B1665 #

Diagnosing a B1665 code requires a systematic approach, starting with the simplest and most common issues before moving to more complex electrical tests. Always ensure the vehicle is parked with the ignition off and follow safety precautions when working around powered seats.

1. Visually inspect under and around the driver’s seat for foreign objects or debris in the seat rails or track.
2. Test the seat’s forward/backward movement using the switch. Listen for any sounds from the motor.
3. Check the seat adjustment switch for sticking or physical damage.
4. Inspect the seat motor wiring and connectors for signs of corrosion, looseness, or damage.
5. Test the seat motor directly (if accessible) by applying 12V power and ground to verify operation.
6. If the motor operates manually, check the seat control module and related fuses/relays.
7. Scan for additional seat-related trouble codes using a diagnostic scan tool.
8. If all above checks pass, consider testing or replacing the seat control module as a last resort.

Possible Repairs for B1665 #

Once the root cause is identified, repairs can range from simple cleaning to component replacement. Always recheck code status after each repair step and verify seat operation before returning the vehicle to use.

• Remove any debris or objects from the seat track/rails and retest seat movement
• Replace the seat forward/backward motor if found faulty or seized
• Repair or replace damaged wiring/connectors to the seat motor or control module
• Replace the seat adjustment switch if it is malfunctioning
• Replace blown fuses or faulty seat motor relays, as applicable
• Replace the seat control module only if all other components test OK

Is It Safe to Drive with B1665? #

Yes, but with limitations. The B1665 code does not affect engine performance or core safety systems. However, if you cannot adjust the driver’s seat, it may compromise comfort, driving posture, and possibly safety if you cannot reach the pedals or controls properly. If the seat is stuck in an unsafe or uncomfortable position, avoid driving until repaired.

Vehicles Most Commonly Affected by B1665 #

While B1665 is a generic OBD-II body code, it is more frequently reported on models with power-adjustable seats. The following vehicles are among those most often associated with this code (though it can occur on many makes):

• Ford F-Series (F-150, F-250)
• Lincoln Navigator
• Chevrolet Silverado and GMC Sierra (with power seats)
• Toyota Camry and Avalon (select years)
• Nissan Altima and Maxima
• Honda Accord (with memory seats)

Common Mistakes & Best Practices for B1665 #

Misdiagnosis can lead to unnecessary parts replacement and frustration. Following a logical process and checking the basics first will save time and money.

• Overlooking simple obstructions like coins, pens, or trash in the seat rails
• Replacing the seat motor before checking wiring and connectors
• Ignoring fuse and relay checks (if applicable to your vehicle)
• Not scanning for additional seat or body control codes that may provide more context
• Skipping functional tests using direct power to the seat motor

Quick FAQ for B1665 #

Here are answers to the most common questions drivers and technicians have about the B1665 code:

• Q: Can I reset the B1665 code by disconnecting the battery?
  A: Disconnecting the battery may clear the code temporarily, but if the underlying issue is not fixed, the code will return as soon as you attempt to use the seat adjustment.
• Q: Is the seat motor difficult to replace?
  A: The difficulty varies by vehicle. On most models, the seat must be removed from the vehicle and partially disassembled. Always follow OEM safety procedures, especially if the vehicle has side airbags or seat occupancy sensors.