B1773 – Mirror Driver Up Circuit Failure

The ODBII code B1773 indicates a malfunction in the mirror driver up circuit, which typically means there is a failure in the electrical circuit responsible for controlling the upward movement of the vehicle’s side mirror.

The severity of ODBII code B1773 Mirror Driver Up Circuit Failure is moderate.

Common Causes For: B1772 Seat Driver Backward Circuit Short To Ground

• Faulty mirror driver module
• Damaged wiring or connectors
• Short circuit in the mirror circuit
• Open circuit in the mirror circuit
• Corroded or loose connections
• Malfunctioning power supply to the mirror
• Defective mirror motor or actuator
• Software or calibration issues in the vehicle’s control module

Common misdiagnosis for B1773 Mirror Driver Up Circuit Failure

• Faulty mirror switch
• Wiring issues or shorts in the harness
• Defective mirror motor
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed window regulator issues
• Problems 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 B1773 indicates a “Mirror Driver Up Circuit Failure,” which typically relates to issues with the power mirror system in a vehicle. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the mirror system and wiring diagrams.
• Inspect the Mirror Switch:
• Test the mirror control switch for proper operation.
• Check for any signs of damage or wear.
• Ensure that the switch is making good contact and is not stuck.
• Examine the Wiring and Connectors:
• Inspect the wiring harness leading to the mirror for any signs of damage, fraying, or corrosion.
• Check the connectors for loose connections or corrosion. Clean and secure any connections as necessary.
• Test the Mirror Motor:
• If accessible, test the mirror motor directly by applying power to it to see if it operates.
• If the motor does not work when powered directly, it may need to be replaced.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring.
• Look for continuity issues or shorts to ground that could be causing the failure.
• Inspect the Body Control Module (BCM):
• The BCM controls many electrical functions in the vehicle, including the mirrors.
• Check for any fault codes in the BCM and ensure it is functioning properly.
• Clear the Codes:
• After performing any repairs or adjustments, clear the OBD-II codes using a scan tool and see if the code returns.
• If the code does not return, the issue may have been resolved.
• Consult a Professional:
• If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems.
• Consider Environmental Factors:
• Sometimes, environmental factors such as moisture or extreme temperatures can affect electrical components. Ensure that the mirror assembly is not exposed to conditions that could cause failure. By following these steps, you should be able to identify and potentially resolve the issue related to the B1773 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.