B1733 – Mirror Driver Vertical Switch Circuit Failure

The ODBII code B1733 indicates a malfunction in the vertical switch circuit of the mirror driver, which may affect the operation of the side mirror adjustments.

The severity of ODBII code B1733 is generally considered moderate.

Common Causes For: B1732 Seat Driver Rear Down Switch Circuit Short To Ground

• Faulty mirror switch
• Damaged wiring or connectors
• Short circuit in the circuit
• Open circuit in the circuit
• Defective mirror motor
• Corroded terminals
• Poor ground connection
• Malfunctioning body control module (BCM)

Common misdiagnosis for B1733 Mirror Driver Vertical Switch Circuit Failure

• Faulty mirror switch
• Wiring issues or shorts in the circuit
• Defective mirror motor
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed window switch problems
• Issues with the vehicle’s electrical system or battery
• Software or programming errors in the vehicle’s computer systems

Common Troubleshooting Steps

The OBD-II code B1733 indicates a problem with the mirror driver vertical switch circuit, which is typically related to the power mirror adjustment system in a vehicle. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• Inspect the Mirror Switch:
• Remove the mirror switch from the vehicle.
• Inspect the switch for any visible damage, corrosion, or wear.
• Test the switch for continuity using a multimeter. Ensure that it functions correctly in all positions.
• Examine Wiring and Connectors:
• Inspect the wiring harness and connectors associated with the mirror switch and the mirror motor.
• Look for frayed wires, loose connections, or corrosion that could affect the circuit.
• Repair or replace any damaged wiring or connectors.
• Test the Mirror Motor:
• If the switch appears to be functioning correctly, test the mirror motor itself.
• Apply direct power to the motor to see if it operates. If it does not, the motor may be faulty and require replacement.
• Check for Ground Issues:
• Ensure that the ground connections for the mirror system are secure and free of corrosion.
• A poor ground can lead to circuit failures and erratic behavior.
• Inspect the Body Control Module (BCM):
• The BCM controls various electrical functions in the vehicle, including power mirrors.
• Check for any faults in the BCM that could be affecting the mirror switch operation.
• If necessary, reprogram or replace the BCM.
• Look for Short Circuits:
• Use a multimeter to check for short circuits in the wiring related to the mirror switch and motor.
• A short circuit can cause the system to malfunction and trigger the B1733 code.
• Clear the Code and Test Drive:
• After performing repairs, clear the trouble code using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult Repair Manual:
• Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the mirror system.
• Seek Professional Help:
• If the issue persists after performing these steps, consider consulting a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1733 code.