B1643 – Mirror Passenger Right Circuit Failure

The ODBII 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.

The severity of ODBII code B1643 is generally considered moderate.

Common Causes For: B1642 Mirror Passenger Left Circuit Short To Ground

• 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 misdiagnosis for B1643 Mirror Passenger Right Circuit Failure

• 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

Common Troubleshooting Steps

The OBD-II code B1643 indicates a “Mirror Passenger Right Circuit Failure.” This code typically relates to issues with the electrical circuit that controls the passenger side mirror. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Visual Inspection:
• Check the passenger side mirror for any physical damage.
• Inspect the wiring harness and connectors leading to the mirror for signs of wear, corrosion, or damage.
• Ensure that the mirror is securely mounted and that there are no loose connections.
• Check Fuses:
• Locate the fuse box and check the fuses related to the power mirrors. Replace any blown fuses.
• Test the Mirror Functionality:
• 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.
• Inspect the Switch:
• Test the mirror control switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced.
• Check for Power and Ground:
• 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.
• Test the Mirror Motor:
• 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.
• 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.
• Check for Short Circuits:
• Inspect the wiring for any short circuits or grounding issues that could affect the mirror circuit.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any potential issues.
• Professional Diagnosis:
• 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.