WOMS
B code body Medium severity

B2349 Mirror Switch Reference Voltage Negative Common Open Circuit

The OBD2 code B2349 indicates a problem with the mirror switch reference voltage, specifically that there is an open circuit in the negative common line, which can affect the operation of the mirror adjustment features

Definition

The OBD2 code B2349 indicates a problem with the mirror switch reference voltage, specifically that there is an open circuit in the negative common line, which can affect the operation of the mirror adjustment features

Common causes

  • Faulty mirror switch
  • Damaged wiring or connectors
  • Short circuit in the wiring harness
  • Corroded or loose connections
  • Failed body control module (BCM)
  • Grounding issues
  • Open circuit in the reference voltage line

Common misdiagnoses

  • Faulty mirror switch
  • Wiring harness issues
  • Short circuit in the wiring
  • Faulty body control module (BCM)
  • Grounding issues
  • Faulty power window switch
  • Incorrectly installed or damaged mirror assembly

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Ground Connections

    Ensure that the battery is fully charged and in good condition

  2. 2. Inspect the ground connections for the mirror switch and related components. A poor ground can cause voltage issues

  3. 3. Inspect the Mirror Switch

    Remove the mirror switch from the vehicle and visually inspect it for any signs of damage, corrosion, or wear

  4. 4. Test the switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced

  5. 5. Examine Wiring and Connectors

    Inspect the wiring harness and connectors leading to the mirror switch for any signs of damage, fraying, or corrosion

  6. 6. Look for any loose or disconnected wires that could cause an open circuit

  7. 7. Check for Short Circuits

    Use a multimeter to check for any short circuits in the wiring. A short to ground can cause the reference voltage to drop, leading to the B2349 code

  8. 8. Test the Reference Voltage

    With the ignition on, use a multimeter to measure the reference voltage at the mirror switch connector. Compare the reading to the specifications in the vehicle's service manual

  9. 9. If the voltage is absent or significantly lower than expected, trace the wiring back to the source to identify any issues

  10. 10. Inspect Related Components

    Check other components that may be related to the mirror switch, such as the body control module (BCM) or any fuses associated with the power mirrors

  11. 11. Ensure that all related components are functioning correctly

  12. 12. Clear the Code and Test Drive

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

  13. 13. Take the vehicle for a test drive to see if the code reappears. If it does, further investigation may be necessary

  14. 14. Consult a Professional

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or an automotive electrician who can perform more advanced diagnostics.Additional Tips: - Always refer to the vehicle's service manual for specific wiring diagrams and specifications. - Safety first: Disconnect the battery before working on electrical components to avoid shorts or shocks. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B2349 code