B1666 – Seat Driver Recline Motor Stalled

The ODBII code B1666 indicates that the driver seat recline motor has stalled, meaning it is not functioning properly or has failed to move as expected.

The severity of ODBII code B1666 is generally considered moderate.

Common Causes For: B1665 Seat Driver Forward/Backward Motor Stalled

• Faulty seat recline motor
• Electrical connection issues (wiring or connectors)
• Blown fuse
• Malfunctioning seat control switch
• Obstruction in the seat mechanism
• Faulty body control module (BCM)

Common misdiagnosis for B1666 Seat Driver Recline Motor Stalled

• Faulty seat recline switch
• Wiring issues or shorts in the seat harness
• Defective seat control module
• Malfunctioning power seat motor
• Battery or power supply issues
• Incorrectly calibrated seat position sensors
• Software or programming errors in the vehicle’s control system

Common Troubleshooting Steps

When dealing with an OBD-II code B1666, which indicates that the seat driver recline motor has stalled, there are several common troubleshooting steps you can take to diagnose and potentially resolve the issue. Here’s a systematic approach:

• 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 other issues affecting the seat recline motor.
• Inspect the Seat Motor and Mechanism: **Visual Inspection: Check the seat recline motor and its wiring for any visible damage, such as frayed wires, corrosion, or loose connections.
• **Physical Obstruction: Ensure that there are no obstructions preventing the seat from reclining. Sometimes, debris or foreign objects can block the mechanism.
• Test the Seat Recline Motor: **Direct Power Test: If safe to do so, you can apply direct power to the motor to see if it operates. This can help determine if the motor itself is faulty.
• **Resistance Check: Use a multimeter to check the resistance of the motor. If the resistance is outside the manufacturer’s specifications, the motor may need to be replaced.
• Check the Wiring and Connectors: Inspect the wiring harness and connectors leading to the seat recline motor. Look for signs of wear, corrosion, or loose connections that could affect the motor’s operation.
• Examine the Seat Control Switch: Test the seat control switch for proper operation. A faulty switch can prevent the motor from receiving the necessary signals to operate.
• If possible, swap the switch with a known good one to see if the issue persists.
• Inspect the Seat Module (if applicable): Some vehicles have a seat control module that manages the operation of the seat motors. Check for any faults in this module, and ensure it is receiving power and ground.
• Check for Ground Issues: Ensure that the seat motor has a good ground connection. A poor ground can lead to insufficient power reaching the motor.
• 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: If the issue persists, consult the vehicle’s service manual for specific troubleshooting steps related to the B1666 code and the seat recline system.
• Seek Professional Help: If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or an automotive technician who specializes in electrical systems. By following these steps, you should be able to identify the cause of the B1666 code and take appropriate action to resolve the issue with the seat driver recline motor.