B1665 – OBD-II DTC

OBD-II DTC B1665 – Seat Driver Forward/Backward Motor Stalled

DTC B1665 meaning

DTC B1665 refers to a diagnostic trouble code indicating that the driver’s seat forward/backward motor has stalled. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components for faults. When the seat motor fails to operate correctly, it triggers this code, signaling a potential issue with the motor or its associated circuitry.

DTC B1665 symptoms

Common symptoms associated with DTC B1665 may include:

• The driver’s seat not moving forward or backward.
• Unusual noises coming from the seat motor when attempting to adjust the seat.
• Intermittent operation of the seat adjustment feature.
• Warning lights illuminated on the dashboard related to the seat or airbag system.

DTC B1665 causes

Several factors can lead to the occurrence of DTC B1665, including:

• A faulty seat motor that has failed or is malfunctioning.
• Wiring issues, such as damaged or corroded wires in the seat adjustment circuit.
• Defective seat switch that may not be sending the correct signals to the motor.
• Problems with the vehicle’s body control module (BCM) that manages the seat functions.

DTC B1665 seriousness

The seriousness of DTC B1665 can vary. While it may not affect the vehicle’s drivability, it can impact driver comfort and safety. A non-adjustable seat can lead to improper driving posture, which may increase the risk of accidents. Additionally, if the issue is related to the airbag system, it could potentially affect the deployment of airbags in the event of a collision.

How to diagnose DTC B1665

To diagnose DTC B1665, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1665 code.
2. Inspect the seat motor and wiring for any visible damage or disconnections.
3. Test the seat switch for proper operation using a multimeter.
4. Check the body control module for any related fault codes or issues.
5. Perform a functional test of the seat motor by applying direct power to it.

How to fix DTC B1665 step-by-step instructions

To fix DTC B1665, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and repair any damaged wiring or connectors related to the seat motor.
3. If the seat motor is faulty, replace it with a new or refurbished unit.
4. Test the seat switch and replace it if it is not functioning correctly.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a functional test of the seat adjustment to ensure proper operation.

How to erase DTC B1665

To erase DTC B1665, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the DTC.
5. Disconnect the scanner and start the vehicle to verify that the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.