WOMS
B code body Medium severity

B2158 Seat Recline Motor Memory Position Out of Range

The OBD2 code B2158 indicates that the seat recline motor's memory position is outside the expected range, suggesting a malfunction or misalignment in the seat adjustment system

Definition

The OBD2 code B2158 indicates that the seat recline motor's memory position is outside the expected range, suggesting a malfunction or misalignment in the seat adjustment system

Common causes

  • Faulty seat recline motor
  • Malfunctioning seat position sensor
  • Wiring issues or short circuits
  • Corroded or damaged connectors
  • Software or calibration errors in the control module
  • Mechanical obstruction in the seat mechanism
  • Low battery voltage or electrical issues
  • Faulty control module or ECU

Common misdiagnoses

  • Faulty seat recline motor
  • Defective seat position sensor
  • Wiring issues or short circuits
  • Malfunctioning body control module (BCM)
  • Incorrectly calibrated memory settings
  • Software or firmware issues in the vehicle's control systems
  • Problems with the power supply to the seat motor

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Seat Motor and Wiring

  3. 3. Visual Inspection

    Check the seat recline motor and its wiring for any visible damage, corrosion, or loose connections

  4. 4. Connector Check

    Ensure that the electrical connectors are secure and free of dirt or corrosion

  5. 5. Test the Seat Recline Motor

  6. 6. Direct Power Test

    If safe to do so, apply direct power to the seat recline motor to see if it operates correctly. If it does not work, the motor may be faulty and need replacement

  7. 7. Resistance Check

    Use a multimeter to check the resistance of the motor. Compare the readings to the manufacturer's specifications

  8. 8. Check the Seat Position Sensors

  9. 9. Sensor Functionality

    Inspect the seat position sensors to ensure they are functioning correctly. If the sensors are faulty, they may not provide accurate position data to the control module

  10. 10. Wiring and Connectors

    Check the wiring and connectors associated with the seat position sensors for damage or poor connections

  11. 11. Inspect the Control Module

  12. 12. Module Functionality

    If the motor and sensors are functioning correctly, the issue may lie with the control module. Check for any software updates or reprogramming that may be needed

  13. 13. Reset the Module

    Sometimes, resetting the control module can clear temporary faults. Disconnect the battery for a few minutes, then reconnect it

  14. 14. Check for Mechanical Obstructions

    Ensure that there are no physical obstructions preventing the seat from reclining properly. This could include debris or foreign objects lodged in the seat mechanism

  15. 15. Review Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the seat recline motor

  16. 16. Consult the Vehicle Manual

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the seat recline system

  17. 17. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking assistance from a professional mechanic or dealership, as they may have specialized tools and knowledge to diagnose the problem accurately. By following these troubleshooting steps, you should be able to identify the cause of the B2158 code and take appropriate action to resolve the issue