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Engine-Codes – Generic – B1F05

B1F05 Code - Electrochromatic Mirror Control Circuit

Quick Answer

The B1F05 diagnostic trouble code (DTC) refers to an issue with the electrochromatic mirror control circuit in a vehicle. Common causes include Faulty electrochromatic mirror control module, Wiring issues in the mirror control circuit, Sensor malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1F05 indicates Electrochromatic Mirror Control Circuit.
Common causes
Common causes include Faulty electrochromatic mirror control module, Wiring issues in the mirror control circuit, Sensor malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B1F05 Description

The B1F05 diagnostic trouble code (DTC) refers to an issue with the electrochromatic mirror control circuit in a vehicle. Electrochromatic mirrors are equipped with a special feature that allows them to automatically dim in response to bright lights from behind, reducing glare for the driver. The control circuit is responsible for regulating this function. When this circuit malfunctions, it can lead to the electrochromatic mirror not dimming properly or not functioning at all.

OBDII Code B1F05 - Electrochromatic Mirror Control Circuit
B1F05 Code - Electrochromatic Mirror Control Circuit

Common Causes of B1F05

  1. Faulty electrochromatic mirror control module
  2. Wiring issues in the mirror control circuit
  3. Sensor malfunction
  4. Electrical faults in the system
  5. Corrosion or damage to connectors

Symptoms of B1F05

  1. Electrochromatic mirror not dimming properly
  2. Mirror dimming intermittently
  3. Mirror not responding to bright lights
  4. Error message on the vehicle's display related to mirror control
  5. Dimming function not working at all

How to Fix B1F05

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the DTC and pinpoint the problem area.
  2. Inspect the wiring and connectors in the electrochromatic mirror control circuit for any signs of damage, corrosion, or loose connections.
  3. Test the sensors and control module to determine if they are functioning correctly or need replacement.
  4. Replace any faulty components, such as the control module, sensors, or wiring, as needed.
  5. Clear the DTC from the vehicle's system and test the electrochromatic mirror to ensure proper dimming function.

Cost to Fix B1F05

The typical repair costs for addressing the B1F05 code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the parts and labor for replacing a faulty electrochromatic mirror control module or sensors can range from $200 to $500. Additional costs may apply for wiring repairs or other necessary components. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for B1F05

B1F05-11 ELECTROCHROMATIC MIRROR CONTROL CIRCUIT SHORT TO GROUND

B1F05-12 ELECTROCHROMATIC MIRROR CONTROL CIRCUIT SHORT TO BATTERY

B1F05-13 ELECTROCHROMATIC MIRROR CONTROL CIRCUIT OPEN

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Code B1F05 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1F05 Code

1. What are the common symptoms of OBDII code B1F05 (Electrochromatic Mirror Control Circuit)?

The common symptoms of code B1F05 include malfunctioning auto-dimming mirrors, erratic mirror adjustments, or complete failure of the mirror control system.

2. What are the possible causes of OBDII code B1F05?

The possible causes of code B1F05 can include a faulty electrochromatic mirror control module, damaged wiring or connectors in the mirror circuit, or a malfunctioning ambient light sensor.

3. How can I diagnose OBDII code B1F05?

Diagnosing code B1F05 involves inspecting the electrochromatic mirror control module for any visible damage, testing the wiring and connectors for continuity, and checking the ambient light sensor's functionality using a multimeter.

4. Can a DIYer repair OBDII code B1F05 at home?

Repairing code B1F05 may require advanced electrical diagnostic skills and specialized tools. It is recommended to consult a professional mechanic or auto electrician for proper diagnosis and repair.

5. Is it safe to drive with OBDII code B1F05 present?

While code B1F05 may not directly affect the drivability of the vehicle, it is important to address the issue promptly as malfunctioning mirror controls can impact visibility and overall safety while driving.

6. How much does it typically cost to repair OBDII code B1F05?

The cost of repairing OBDII code B1F05 can vary depending on the exact cause of the issue. It is advisable to obtain a diagnosis from a qualified technician to determine the repair cost accurately.

7. Can resetting the OBDII system clear code B1F05?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code B1F05 is not addressed, the code is likely to reappear upon the next system check.

8. Are there any preventive measures to avoid OBDII code B1F05 in the future?

To prevent OBDII code B1F05, it is essential to regularly inspect the mirror control system, ensure proper wiring connections, and promptly address any issues with the electrochromatic mirror functionality.

9. Will replacing the electrochromatic mirror fix OBDII code B1F05?

While a faulty mirror could be the root cause of code B1F05, it is recommended to diagnose the issue comprehensively before replacing any components to ensure an accurate repair and prevent unnecessary expenses.

10. How long does it take to repair OBDII code B1F05?

The repair time for OBDII code B1F05 can vary based on the exact cause of the issue and the complexity of the repair. It is best to consult with a professional technician to get an estimate of the repair duration.

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