B1657 – OBD-II DTC

OBD-II DTC B1657 – Seat Driver Rear Up Circuit Short To Battery

DTC B1657 meaning

DTC B1657 refers to a diagnostic trouble code indicating a short circuit in the driver rear seat up circuit, which is part of the power seat system. This code is triggered when the vehicle’s onboard diagnostic system detects that the voltage in the driver rear seat up circuit is higher than expected, suggesting a direct connection to the battery or a fault in the wiring or components associated with the seat adjustment mechanism.

DTC B1657 symptoms

Common symptoms associated with DTC B1657 may include:

• Driver rear seat not moving up or down
• Intermittent or complete loss of power seat functionality
• Warning lights illuminated on the dashboard
• Unusual noises from the seat adjustment mechanism

DTC B1657 causes

Several factors can lead to the triggering of DTC B1657, including:

• Short circuit in the wiring harness
• Faulty seat switch or control module
• Damaged connectors or terminals
• Corrosion or debris in the electrical connections
• Malfunctioning power seat motor

DTC B1657 seriousness

DTC B1657 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can compromise the functionality of the power seat, which is essential for driver comfort and safety. Ignoring this code may lead to further electrical issues or damage to the seat adjustment system.

How to diagnose DTC B1657

To diagnose DTC B1657, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the wiring and connectors associated with the driver rear seat up circuit for any visible damage or corrosion.
3. Test the seat switch for proper operation using a multimeter.
4. Check the power seat motor for functionality.
5. Perform a continuity test on the wiring harness to identify any shorts or breaks.

How to fix DTC B1657 step-by-step instructions

To fix DTC B1657, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors found during diagnosis.
3. Replace the faulty seat switch if it does not operate correctly.
4. Test and replace the power seat motor if it is malfunctioning.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the power seat functionality to ensure the issue is resolved.

How to erase DTC B1657

To erase DTC B1657, 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 trouble codes section on the scanner.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not reappear.