B1741 – Mirror Passenger Vertical Switch Circuit Failure

The ODBII code B1741 indicates a malfunction in the passenger side mirror’s vertical switch circuit, which may affect the adjustment of the mirror’s position.

The severity of ODBII code B1741 is generally considered low.

Common Causes For: B1740 Mirror Driver Horizontal Switch Circuit Short To Ground

• Faulty passenger mirror vertical switch
• Damaged wiring or connectors in the switch circuit
• Short circuit in the wiring harness
• Corroded or poor electrical connections
• Malfunctioning power mirror motor
• Blown fuse related to the mirror system
• Issues with the body control module (BCM)

Common misdiagnosis for B1741 Mirror Passenger Vertical Switch Circuit Failure

• Faulty passenger side mirror motor
• Wiring issues or shorts in the mirror circuit
• Defective mirror switch assembly
• Body control module (BCM) malfunction
• Incorrectly diagnosed window switch issues
• General electrical system problems
• Faulty connectors or terminals related to the mirror system

Common Troubleshooting Steps

The OBD-II code B1741 indicates a problem with the passenger side mirror’s vertical switch circuit. This code typically points to an issue with the switch itself, the wiring, or the mirror motor. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Visual Inspection:
• Check the passenger side mirror for any visible damage.
• Inspect the wiring harness connected to the mirror and the switch for any signs of fraying, corrosion, or disconnection.
• Check the Switch:
• Remove the switch from the door panel and inspect it for any signs of damage or wear.
• Use a multimeter to test the switch for continuity. If the switch is faulty, it may need to be replaced.
• Test the Mirror Motor:
• If the switch is functioning correctly, check the mirror motor. You can do this by applying direct power to the motor to see if it operates.
• If the motor does not work when powered directly, it may need to be replaced.
• Inspect the Wiring:
• Follow the wiring from the switch to the mirror motor. Look for any breaks, shorts, or corrosion in the connectors.
• Use a multimeter to check for continuity in the wiring. If there is a break, repair or replace the damaged section.
• Check for Ground Issues:
• Ensure that the ground connection for the mirror and switch is secure and free of corrosion. A poor ground can cause circuit failures.
• 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.
• Clear Codes and Test:
• After performing repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Consult Wiring Diagrams:
• If the issue persists, consult the vehicle’s wiring diagrams to trace the circuit and identify any other potential issues.
• Professional Help:
• If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or an automotive electrician. By following these steps, you should be able to identify and address the cause of the B1741 code.