B1647 – OBD-II DTC

OBD-II DTC B1647 – Seat Driver Recline Forward Circuit Failure

DTC B1647 meaning

DTC B1647 refers to a fault in the seat driver recline forward circuit. This diagnostic trouble code indicates that the vehicle’s onboard diagnostic system has detected an issue with the electrical circuit responsible for controlling the forward recline function of the driver’s seat. The code is specific to the seat adjustment system and may affect the functionality of the seat’s recline feature.

DTC B1647 symptoms

Common symptoms associated with DTC B1647 may include:

• The driver’s seat recline function may not operate correctly.
• Inability to adjust the seat position for comfort.
• Other seat adjustment functions may also be affected.
• Warning lights may illuminate on the dashboard.

DTC B1647 causes

Several factors can lead to the occurrence of DTC B1647, including:

• Faulty seat recline motor.
• Damaged or frayed wiring in the recline circuit.
• Corroded connectors or terminals.
• Issues with the seat control module.
• Faulty switches that control the recline function.

DTC B1647 seriousness

The seriousness of DTC B1647 can vary. While it may not pose an immediate safety risk, it can affect the driver’s comfort and ability to adjust the seat properly. If left unaddressed, it may lead to further electrical issues or complications with the seat adjustment system.

How to diagnose DTC B1647

To diagnose DTC B1647, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the seat recline motor and wiring for visible damage.
3. Check the connectors for corrosion or loose connections.
4. Test the seat control module for proper operation.
5. Examine the switches for functionality.

How to fix DTC B1647 step-by-step instructions

To fix DTC B1647, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the recline circuit.
3. Replace the seat recline motor if it is found to be faulty.
4. Test the seat control module and replace it if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the seat recline function to ensure it operates correctly.

How to erase DTC B1647

To erase DTC B1647, 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 ensure the code does not return.

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