WOMS
B code body Medium severity

B1656 Seat Driver Rear Up Circuit Open

The OBD2 code B1656 indicates that there is an open circuit in the driver rear seat's up adjustment mechanism, meaning the system is unable to detect the position or operation of the seat's upward movement

Definition

The OBD2 code B1656 indicates that there is an open circuit in the driver rear seat's up adjustment mechanism, meaning the system is unable to detect the position or operation of the seat's upward movement

Common causes

  • Open circuit in the wiring
  • Faulty seat position sensor
  • Damaged connector or terminals
  • Faulty power seat switch
  • Malfunctioning body control module (BCM)
  • Ground connection issues

Common misdiagnoses

  • Faulty seat switch
  • Wiring issues or shorts
  • Defective seat motor
  • Malfunctioning body control module (BCM)
  • Poor ground connection
  • Incorrectly installed or damaged seat harness
  • Faulty power supply to the seat circuit

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Check the wiring harness and connectors associated with the seat adjustment mechanism. Look for any signs of damage, fraying, or corrosion

  2. 2. Seat Mechanism

    Inspect the seat itself for any obstructions or mechanical issues that could prevent movement

  3. 3. Check Fuses

    Locate the fuse box and check for any blown fuses related to the power seat system. Replace any blown fuses and see if the issue persists

  4. 4. Test the Seat Switch

    Use a multimeter to test the seat switch for continuity. If the switch is faulty, it may need to be replaced

  5. 5. Inspect the Motor

    If the switch is functioning correctly, check the seat motor. You can do this by applying direct power to the motor to see if it operates. If it does not, the motor may be faulty and require replacement

  6. 6. Check for Ground Issues

    Ensure that the ground connections for the seat motor and switch are secure and free of corrosion. A poor ground can lead to an open circuit

  7. 7. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

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

    If all other components check out, the issue may lie within the BCM. Check for any software updates or faults in the module

  9. 9. Perform a Reset

    After addressing any issues, clear the trouble codes using an OBD-II scanner and see if the code returns after a test drive

  10. 10. Consult Repair Manual

    Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the seat adjustment system

  11. 11. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems. By following these steps, you should be able to identify and potentially resolve the issue related to the B1656 code