B1649 – OBD-II DTC

OBD-II DTC B1649 – Seat Driver Recline Forward Circuit Short To Battery

DTC B1649 meaning

DTC B1649 refers to a diagnostic trouble code indicating a short circuit in the driver seat recline forward circuit to the battery. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems for faults. When the system detects an abnormal voltage or current flow in the seat recline mechanism, it triggers this code to alert the technician of a potential issue.

DTC B1649 symptoms

Common symptoms associated with DTC B1649 may include:

• Driver seat recline function not working
• Seat position may be stuck or unable to adjust
• Warning lights illuminated on the dashboard
• Possible blown fuses related to the seat adjustment system

DTC B1649 causes

Several factors can lead to the occurrence of DTC B1649, including:

• Wiring issues such as frayed or damaged wires
• Faulty seat recline motor
• Short circuit in the seat adjustment switch
• Corrosion or poor connections in the electrical connectors
• Malfunctioning body control module (BCM)

DTC B1649 seriousness

DTC B1649 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can impact the comfort and safety of the driver. A malfunctioning seat recline function can lead to improper seating position, which may affect driving posture and visibility.

How to diagnose DTC B1649

To diagnose DTC B1649, follow these steps:

• Use an OBD-II scanner to confirm the presence of the code.
• Inspect the wiring and connectors related to the seat recline circuit for damage or corrosion.
• Test the seat recline motor for proper operation.
• Check the seat adjustment switch for functionality.
• Examine the body control module for any faults or issues.

How to fix DTC B1649 step-by-step instructions

To fix DTC B1649, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect the wiring harness for any visible damage or shorts.
3. Repair or replace any damaged wires or connectors.
4. Test the seat recline motor by applying direct power to see if it operates.
5. Replace the seat recline motor if it does not function properly.
6. Check the seat adjustment switch for continuity and replace if faulty.
7. Reconnect the battery and clear the DTC using an OBD-II scanner.
8. Test the seat recline function to ensure it operates correctly.

How to erase DTC B1649

To erase DTC B1649, follow these steps:

• Connect an OBD-II scanner to the vehicle’s diagnostic port.
• Turn on the ignition without starting the engine.
• Navigate to the trouble codes section on the scanner.
• Select the option to clear or erase the codes.
• Confirm the action and wait for the scanner to complete the process.
• Disconnect the scanner and start the vehicle to ensure the code does not return.

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