WOMS
B code body Medium severity

B1657 Seat Driver Rear Up Circuit Short To Battery

The OBD2 code B1657 indicates a short circuit in the driver rear seat's up adjustment circuit, causing it to connect directly to the battery, which can lead to malfunctioning of the seat adjustment system

Definition

The OBD2 code B1657 indicates a short circuit in the driver rear seat's up adjustment circuit, causing it to connect directly to the battery, which can lead to malfunctioning of the seat adjustment system

Common causes

  • Shorted wiring or connectors
  • Faulty seat motor
  • Damaged seat control module
  • Corroded or loose electrical connections
  • Malfunctioning switch or control panel
  • Grounding issues
  • Aftermarket modifications or installations

Common misdiagnoses

  • Faulty seat switch
  • Wiring harness issues
  • Defective seat motor
  • Malfunctioning body control module (BCM)
  • Shorted wiring in the seat assembly
  • Incorrectly installed or damaged connectors
  • Issues with the power supply circuit

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1657 code

  2. 2. Check for any additional codes that may provide more context

  3. 3. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the seat adjustment mechanism for any signs of damage, fraying, or corrosion

  4. 4. Connector Condition

    Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Check for Short Circuits

    Multimeter Testing: Use a multimeter to check for continuity in the seat adjustment circuit. Look for any shorts to ground or battery voltage

  6. 6. Resistance Check

    Measure the resistance in the circuit to identify any abnormal readings that could indicate a short

  7. 7. Inspect the Seat Adjustment Motor

    Motor Functionality: Test the seat adjustment motor to ensure it is functioning properly. If the motor is shorted internally, it may cause the code to trigger

  8. 8. Power Supply

    Verify that the motor is receiving the correct voltage when the seat adjustment switch is activated

  9. 9. Check the Seat Adjustment Switch

    Switch Operation: Test the seat adjustment switch for proper operation. A faulty switch can cause incorrect signals to be sent to the control module

  10. 10. Wiring to Switch

    Inspect the wiring leading to the switch for any damage or shorts

  11. 11. Inspect the Body Control Module (BCM)

    BCM Functionality: If all other components check out, the issue may lie within the BCM. Ensure that it is functioning correctly and is not sending erroneous signals

  12. 12. Software Updates

    Check if there are any software updates or recalls related to the BCM that may address the issue

  13. 13. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the code using the OBD-II scanner

  14. 14. Take the vehicle for a test drive to see if the code returns

  15. 15. Seek Professional Help

    If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or automotive technician who has experience with electrical systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1657 code. Always ensure safety precautions are taken when working with electrical systems in vehicles