B1773 – OBD-II DTC

OBD-II DTC B1773 – Mirror Driver Up Circuit Failure

DTC B1773 meaning

DTC B1773 refers to a diagnostic trouble code indicating a failure in the mirror driver up circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems. The mirror driver up circuit is responsible for controlling the upward movement of the side mirror, and a failure in this circuit can lead to issues with mirror adjustment.

DTC B1773 symptoms

Common symptoms associated with DTC B1773 may include:

• Inability to adjust the side mirror upward
• Mirror position remains fixed
• Other mirror adjustment functions may work intermittently
• Warning lights on the dashboard related to the mirror system

DTC B1773 causes

Several factors can lead to the triggering of DTC B1773, including:

• Faulty mirror adjustment switch
• Damaged wiring or connectors in the mirror circuit
• Defective mirror motor
• Issues with the vehicle’s body control module (BCM)

DTC B1773 seriousness

The seriousness of DTC B1773 can vary. While it may not affect the vehicle’s overall performance, it can compromise safety by limiting the driver’s ability to adjust mirrors properly. This can lead to visibility issues and increase the risk of accidents. Therefore, it is advisable to address this code promptly.

How to diagnose DTC B1773

To diagnose DTC B1773, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1773 code.
2. Inspect the mirror adjustment switch for any visible damage or wear.
3. Check the wiring and connectors for continuity and signs of damage.
4. Test the mirror motor to ensure it is functioning correctly.
5. Examine the body control module for any faults or issues.

How to fix DTC B1773 step-by-step instructions

To fix DTC B1773, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and replace the mirror adjustment switch if it is found to be faulty.
3. Repair or replace any damaged wiring or connectors in the mirror circuit.
4. Test and replace the mirror motor if it is not functioning properly.
5. Reprogram or replace the body control module if necessary.
6. Reconnect the battery and clear the DTC using an OBD-II scanner.

How to erase DTC B1773

To erase DTC B1773, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the DTC.
5. Disconnect the scanner and start the vehicle to ensure the code does not return.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.