WOMS
B code body Medium severity

B2345 Seat Switch Reference Voltage Negative Common Open Circuit

The OBD2 code B2345 indicates a fault in the seat switch circuit, specifically that the reference voltage for the seat switch is not detected, suggesting an open circuit or a disconnection in the wiring

Definition

The OBD2 code B2345 indicates a fault in the seat switch circuit, specifically that the reference voltage for the seat switch is not detected, suggesting an open circuit or a disconnection in the wiring

Common causes

  • Faulty seat switch
  • Damaged wiring or connectors
  • Poor ground connection
  • Open circuit in the seat switch circuit
  • Short circuit to ground
  • Malfunctioning body control module (BCM)
  • Corroded terminals or connectors

Common misdiagnoses

  • Faulty seat switch
  • Wiring harness issues
  • Faulty body control module (BCM)
  • Ground connection problems
  • Faulty power seat motor
  • Corroded connectors
  • Malfunctioning seat position sensor
  • Software or calibration issues in the BCM

Troubleshooting steps

  1. 1. Understand the Code

    B2345 typically relates to a problem with the seat switch circuit, specifically indicating that the reference voltage is not being properly received or is open

  2. 2. Check the Vehicle's Service Manual

    Refer to the specific service manual for your vehicle to understand the wiring diagrams and the specific components involved in the seat switch circuit

  3. 3. Visual Inspection

    Inspect the seat switch and its wiring for any visible damage, such as frayed wires, corrosion, or loose connections

  4. 4. Check the connectors for any signs of wear or damage

  5. 5. Test the Seat Switch

    Use a multimeter to test the seat switch for continuity. Ensure that the switch operates correctly when pressed

  6. 6. If the switch is faulty, replace it

  7. 7. Check the Reference Voltage

    Measure the reference voltage at the seat switch connector with a multimeter. Compare it to the specifications in the service manual

  8. 8. If there is no voltage, trace the wiring back to the source to identify where the break or fault may be

  9. 9. Inspect Ground Connections

    Ensure that the ground connections for the seat switch circuit are secure and free of corrosion

  10. 10. Test the ground with a multimeter to ensure it has a good connection

  11. 11. Check for Short Circuits

    Inspect the wiring for any signs of short circuits that could cause the reference voltage to drop or become open

  12. 12. Use a multimeter to check for continuity between the reference voltage wire and ground

  13. 13. 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

  14. 14. Inspect Related Components

    Check any related components, such as the body control module (BCM) or any other modules that may interact with the seat switch circuit

  15. 15. Clear the Code and Test Drive

    After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.1

  16. 16. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B2345 code