What are the symptoms of B1666 OBD-II DTC?

Common symptoms associated with DTC B1666 may include: The driver’s seat recline function is inoperative. Unusual noises coming from the seat adjustment mechanism. Warning lights illuminated on the dashboard related to the seat or electrical system. Intermittent operation of the seat recline feature.

What causes B1666 OBD-II DTC?

Several factors can lead to the occurrence of DTC B1666, including: A faulty seat recline motor. Wiring issues, such as damaged or corroded connectors. Faulty seat control switch. Electrical shorts or open circuits in the seat adjustment system. Issues with the vehicle’s body control module (BCM) that manages seat functions.

DTClookup.com

Search DTC

B1666 – OBD-II DTC

OBD-II DTC B1666 – Seat Driver Recline Motor Stalled

DTC B1666 meaning

DTC B1666 refers to a diagnostic trouble code indicating that the seat driver recline motor has stalled. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various components in a vehicle for faults. When the recline motor fails to operate correctly, the system detects this issue and triggers the B1666 code, signaling a problem with the seat adjustment mechanism.

DTC B1666 symptoms

Common symptoms associated with DTC B1666 may include:

The driver’s seat recline function is inoperative.
Unusual noises coming from the seat adjustment mechanism.
Warning lights illuminated on the dashboard related to the seat or electrical system.
Intermittent operation of the seat recline feature.

DTC B1666 causes

Several factors can lead to the occurrence of DTC B1666, including:

A faulty seat recline motor.
Wiring issues, such as damaged or corroded connectors.
Faulty seat control switch.
Electrical shorts or open circuits in the seat adjustment system.
Issues with the vehicle’s body control module (BCM) that manages seat functions.

DTC B1666 seriousness

The seriousness of DTC B1666 can vary. While it may not pose an immediate safety risk, it can affect the comfort and adjustability of the driver’s seat. If left unaddressed, it may lead to further electrical issues or complications with other seat functions. It is advisable to diagnose and repair the issue promptly to ensure proper vehicle operation.

How to diagnose DTC B1666

To diagnose DTC B1666, follow these steps:

Use an OBD-II scanner to confirm the presence of the B1666 code.
Inspect the seat recline motor and wiring for visible damage or disconnections.
Test the seat control switch for proper operation.
Check for any additional trouble codes that may indicate related issues.
Perform a continuity test on the wiring harness to ensure there are no shorts or open circuits.
Test the seat recline motor directly to determine if it is functioning correctly.

How to fix DTC B1666 step-by-step instructions

To fix DTC B1666, follow these step-by-step instructions:

Disconnect the vehicle’s battery to ensure safety while working on electrical components.
Inspect and repair any damaged wiring or connectors related to the seat recline motor.
If the seat control switch is faulty, replace it with a new one.
Test the seat recline motor if it is defective, replace it with a new motor.
Reconnect all components and ensure everything is securely fastened.
Reconnect the vehicle’s battery.
Use an OBD-II scanner to clear the DTC and check if the code reappears after testing the seat recline function.

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

← All OBD-II Diagnostic Trouble Codes

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.