WOMS
B code body Medium severity

B1643 Mirror Passenger Right Circuit Failure

The OBD2 code B1643 indicates a failure in the passenger right mirror circuit, typically related to a malfunction in the wiring, connector, or the mirror assembly itself

Definition

The OBD2 code B1643 indicates a failure in the passenger right mirror circuit, typically related to a malfunction in the wiring, connector, or the mirror assembly itself

Common causes

  • Faulty passenger side mirror assembly
  • Damaged wiring or connectors in the mirror circuit
  • Blown fuse related to the mirror system
  • Malfunctioning mirror control switch
  • Short circuit in the wiring harness
  • Corrosion or poor connections at the terminals
  • Failed body control module (BCM)

Common misdiagnoses

  • Faulty passenger side mirror switch
  • Wiring issues or shorts in the mirror circuit
  • Malfunctioning body control module (BCM)
  • Defective passenger side mirror motor
  • Issues with the vehicle's electrical system or battery
  • Problems with the door harness or connectors
  • Incorrectly diagnosed window regulator issues

Troubleshooting steps

  1. 1. Visual Inspection

  2. 2. Check the passenger side mirror for any physical damage

  3. 3. Inspect the wiring harness and connectors leading to the mirror for signs of wear, corrosion, or damage

  4. 4. Ensure that the mirror is securely mounted and that there are no loose connections

  5. 5. Check Fuses

  6. 6. Locate the fuse box and check the fuses related to the power mirrors. Replace any blown fuses

  7. 7. Test the Mirror Functionality

  8. 8. Use the mirror adjustment switch to see if the mirror responds. If it does not move, the issue may be with the switch itself or the mirror motor

  9. 9. Inspect the Switch

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

  11. 11. Check for Power and Ground

  12. 12. Use a multimeter to check for power and ground at the mirror connector. If there is no power, trace the wiring back to the switch and fuse box to find the break in the circuit

  13. 13. Test the Mirror Motor

  14. 14. If power is present at the mirror connector, the issue may lie with the mirror motor itself. You can test the motor by applying direct power to it to see if it operates

  15. 15. Scan for Additional Codes

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

  17. 17. Check for Short Circuits

  18. 18. Inspect the wiring for any short circuits or grounding issues that could affect the mirror circuit

  19. 19. Consult Wiring Diagrams

  20. 20. Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any potential issues

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify the cause of the B1643 code and take appropriate action to resolve the issue