B1743 – Mirror Passenger Vertical Switch Circuit Short To Battery

The ODBII code B1743 indicates a short circuit in the passenger mirror’s vertical switch circuit, causing it to connect directly to the battery voltage.

The severity of ODBII code B1743 is moderate.

Common Causes For: B1742 Mirror Passenger Vertical Switch Circuit Open

• Shorted wiring or connectors in the mirror switch circuit.
• Faulty mirror vertical switch.
• Damaged or corroded wiring harness.
• Malfunctioning power mirror motor.
• Poor ground connection in the circuit.

Common misdiagnosis for B1743 Mirror Passenger Vertical Switch Circuit Short To Battery

• Faulty passenger side mirror switch
• Wiring harness issues
• Short circuit in the mirror motor
• Faulty body control module (BCM)
• Incorrectly installed or damaged mirror assembly
• Grounding issues in the electrical system
• Faulty connectors or terminals in the circuit

Common Troubleshooting Steps

When dealing with an OBD-II code B1743, which indicates a “Mirror Passenger Vertical Switch Circuit Short To Battery,” you can follow these common troubleshooting steps:

• Verify the Code: Use an OBD-II scanner to confirm the presence of the B1743 code. Clear the code and see if it returns after a short drive.
• Inspect the Wiring and Connectors:
• Check the wiring harness and connectors associated with the passenger side mirror switch. Look for any signs of damage, fraying, or corrosion.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Check the Switch:
• Test the passenger mirror vertical switch for proper operation. You can do this by using a multimeter to check for continuity when the switch is activated.
• If the switch is faulty, it may need to be replaced.
• Inspect the Mirror Assembly:
• Examine the mirror assembly itself for any signs of damage or short circuits. Sometimes, the internal components of the mirror can cause issues.
• Check for Short Circuits:
• Use a multimeter to check for shorts in the wiring. Disconnect the switch and check the resistance between the switch terminals and ground. A low resistance reading may indicate a short to battery.
• Test the Power Supply:
• Ensure that the power supply to the mirror switch is functioning correctly. Check for proper voltage at the switch connector with the ignition on.
• Look for Related Codes:
• Check for any other related trouble codes that may provide additional context or indicate a broader issue with the vehicle’s electrical system.
• Inspect Ground Connections:
• Ensure that all ground connections related to the mirror and switch are clean and secure. Poor grounding can lead to erratic behavior.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any other components that may be involved.
• Perform a Visual Inspection:
• Look for any signs of water intrusion or damage in the area around the mirror and switch, as moisture can cause electrical issues. 1
• Replace Components as Necessary:
• If you identify any faulty components (switch, wiring, or mirror assembly), replace them as needed. 1
• Recheck the System:
• After making repairs, clear the codes and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists after troubleshooting, it may be best to consult a professional mechanic for further diagnosis and repair.