WOMS
B code body Medium severity

B2346 Mirror Switch Reference Voltage Positive Common Open Circuit

The OBD2 code B2346 indicates a problem with the mirror switch reference voltage, specifically that there is an open circuit in the positive common line, which affects the operation of the mirror switch

Definition

The OBD2 code B2346 indicates a problem with the mirror switch reference voltage, specifically that there is an open circuit in the positive common line, which affects the operation of the mirror switch

Common causes

  • Faulty mirror switch
  • Open circuit in wiring harness
  • Poor connection or corrosion at connectors
  • Damaged or frayed wires
  • Faulty body control module (BCM)
  • Short circuit in the circuit
  • Grounding issues
  • Malfunctioning power supply to the switch

Common misdiagnoses

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

Troubleshooting steps

  1. 1. Check the Vehicle's Service Manual

    Refer to the specific service manual for your vehicle to understand the wiring diagrams and specifications related to the mirror switch and its reference voltage

  2. 2. Visual Inspection

    Inspect the wiring harness and connectors associated with the mirror switch for any signs of damage, corrosion, or loose connections

  3. 3. Look for any frayed wires or broken connectors that could cause an open circuit

  4. 4. Test the Mirror Switch

    Remove the mirror switch from the vehicle and test it for continuity using a multimeter

  5. 5. Check for proper operation of the switch by applying power and ground to the appropriate terminals

  6. 6. Check Reference Voltage

    Use a multimeter to measure the reference voltage at the mirror switch connector. Compare the reading to the specifications in the service manual

  7. 7. If the voltage is absent or significantly lower than expected, there may be an issue upstream

  8. 8. Inspect Related Components

    Check any related components, such as the body control module (BCM) or any fuses associated with the mirror switch circuit

  9. 9. Ensure that the BCM is functioning properly and that there are no fault codes related to it

  10. 10. Check Ground Connections

    Ensure that the ground connections for the mirror switch and related components are secure and free of corrosion

  11. 11. A poor ground can lead to voltage issues and trigger the B2346 code

  12. 12. Perform a Continuity Test

    With the mirror switch disconnected, perform a continuity test on the wiring between the switch and the BCM or other relevant modules

  13. 13. Look for any breaks in the wiring that could cause an open circuit

  14. 14. 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

  15. 15. Clear Codes and Test Drive

    After performing repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  16. 16. Consult a Professional

    If the issue persists after following these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B2346 code