B1745 – Mirror Passenger Horizontal Switch Circuit Failure

The ODBII code B1745 indicates a malfunction in the passenger side mirror’s horizontal switch circuit, which may affect the adjustment of the mirror’s position.

The severity of ODBII code B1745 is generally considered moderate.

Common Causes For: B1744 Mirror Passenger Vertical Switch Circuit Short To Ground

• Faulty passenger side mirror switch
• Damaged wiring or connectors in the mirror switch circuit
• Short circuit in the mirror switch circuit
• Open circuit in the mirror switch circuit
• Faulty passenger side mirror motor
• Corrosion or poor connections in the circuit
• Malfunctioning body control module (BCM)

Common misdiagnosis for B1745 Mirror Passenger Horizontal Switch Circuit Failure

• Faulty passenger side mirror motor
• Wiring issues or shorts in the mirror circuit
• Defective mirror switch
• Problems with the body control module (BCM)
• Incorrectly diagnosed window switch issues
• General electrical system faults
• Issues with the vehicle’s main wiring harness

Common Troubleshooting Steps

The OBD-II code B1745 indicates a problem with the passenger side mirror’s horizontal 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 wear, fraying, or corrosion.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Check the Switch:
• Test the passenger mirror horizontal switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced.
• If possible, swap the switch with a known good one to see if the problem persists.
• Inspect the Mirror Motor:
• Test the mirror motor by applying direct power to it to see if it operates correctly. If the motor does not respond, it may need to be replaced.
• Check for any obstructions that may prevent the mirror from moving.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring. Look for any wires that may be touching each other or grounding out.
• 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.
• Inspect the Body Control Module (BCM):
• The BCM controls various electrical functions in the vehicle, including the mirrors. Check for any faults in the BCM that may be affecting the mirror operation.
• Clear the Code:
• After performing the above checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams to trace the circuit and identify any potential issues.
• Professional Diagnosis:
• If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive electrician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1745 code.