WOMS
B code body Medium severity

B1684 Mirror Driver/Passenger Switch Circuit Open

The OBD2 code B1684 indicates that there is an open circuit in the driver or passenger mirror switch, which means the switch is not properly communicating with the vehicle's electrical system

Definition

The OBD2 code B1684 indicates that there is an open circuit in the driver or passenger mirror switch, which means the switch is not properly communicating with the vehicle's electrical system

Common causes

  • Faulty mirror switch
  • Damaged wiring or connectors
  • Poor ground connection
  • Short circuit in the circuit
  • Faulty mirror motor
  • Corroded terminals
  • Open circuit in the wiring harness

Common misdiagnoses

  • Faulty mirror switch
  • Wiring issues or shorts
  • Defective mirror motor
  • Body control module (BCM) failure
  • Poor ground connection
  • Incorrectly installed or damaged mirror assembly
  • Software or programming errors in the vehicle's computer system

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Check the wiring harness and connectors associated with the mirror switch for any signs of damage, corrosion, or loose connections

  2. 2. Switch Condition

    Inspect the mirror driver/passenger switch for physical damage or wear

  3. 3. Check for Related Codes

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

  4. 4. Test the Mirror Switch

    Continuity Test: Use a multimeter to check for continuity in the mirror switch circuit. Disconnect the switch and test the terminals to ensure there is continuity when the switch is activated

  5. 5. Resistance Check

    Measure the resistance of the switch to ensure it is within the manufacturer’s specifications

  6. 6. Inspect the Mirror Assembly

    If the switch tests good, check the mirror assembly itself. Ensure that the mirror motor and any associated wiring are functioning properly

  7. 7. Check for Ground Issues

    Ensure that the ground connections for the mirror switch and motor are secure and free of corrosion. A poor ground can lead to circuit issues

  8. 8. Test the Power Supply

    Verify that the mirror switch is receiving the correct voltage. Use a multimeter to check the voltage at the switch connector while the ignition is on

  9. 9. Scan for Module Issues

    If the vehicle has a Body Control Module (BCM) or similar control unit, check for any faults or issues within that module that could affect the mirror switch operation

  10. 10. Repair or Replace Components

    Based on your findings, repair any damaged wiring or connectors. If the switch or mirror assembly is faulty, consider replacing it

  11. 11. Clear Codes and Test Drive

    After making repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Professional Help

    If you are unable to resolve the issue after these steps, consider seeking assistance from a professional mechanic or automotive technician who has experience with electrical systems. By following these steps, you should be able to identify and address the cause of the B1684 code effectively