B1644 – Mirror Passenger Right Circuit Open

The ODBII code B1644 indicates that there is an open circuit in the passenger side mirror’s electrical system, which means the mirror is not receiving power or is not functioning properly.

The severity of ODBII code B1644 is moderate.

Common Causes For: B1643 Mirror Passenger Right Circuit Failure

• Open circuit in the wiring harness
• Faulty passenger side mirror assembly
• Damaged or corroded connectors
• Blown fuse
• Faulty body control module (BCM)
• Poor ground connection

Common misdiagnosis for B1644 Mirror Passenger Right Circuit Open

• Faulty passenger side mirror
• Wiring issues or shorts in the mirror circuit
• Malfunctioning body control module (BCM)
• Defective switch or control for the mirror
• Issues with the vehicle’s electrical system or ground connections
• Faulty connectors or terminals related to the mirror circuit
• Problems with the power supply to the mirror

Common Troubleshooting Steps

The OBD-II code B1644 indicates a problem with the passenger side mirror circuit, specifically that there is an open circuit. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific wiring diagrams and component locations related to the passenger side mirror.
• Visual Inspection:
• Inspect the wiring harness and connectors leading to the passenger side mirror for any signs of damage, corrosion, or loose connections.
• Check the mirror itself for any physical damage.
• Test the Mirror Functionality:
• If the vehicle has power mirrors, try adjusting the passenger side mirror using the control switch. If it does not respond, this may confirm an issue with the circuit.
• Check the Fuse:
• Locate the fuse box and check for any blown fuses related to the mirrors or electrical components. Replace any blown fuses and retest.
• Test the Power Supply:
• Use a multimeter to check for voltage at the mirror connector. If there is no voltage, trace the wiring back to the switch and check for continuity.
• Inspect the Switch:
• Test the mirror control switch to ensure it is functioning properly. If the switch is faulty, it may not send the correct signals to the mirror.
• Check for Ground Issues:
• Ensure that the ground connection for the mirror circuit is secure and free of corrosion. A poor ground can cause an open circuit.
• Look for Short Circuits:
• Inspect the wiring for any signs of short circuits or pinched wires that could cause an open circuit.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide more context to the issue.
• Replace Components if Necessary:
• If you identify a faulty component (such as the mirror, switch, or wiring), replace it and clear the codes to see if the issue is resolved. 1
• Professional Diagnosis:
• If the problem 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 and resolve the issue related to the B1644 code.