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B124A Lexus Code - Automatic High Beam Mirror

Quick Answer

The B124A code for Lexus indicates a problem with the automatic high beam mirror system. Common causes include Faulty sensors in the automatic high beam mirror system, Wiring issues or electrical problems, Malfunctioning control module. 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
B124A Lexus indicates Automatic High Beam Mirror.
Common causes
Common causes include Faulty sensors in the automatic high beam mirror system, Wiring issues or electrical problems, Malfunctioning control module.
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 11, 2024
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Code B124A Lexus Description

The B124A code for Lexus indicates a problem with the automatic high beam mirror system. This system is designed to automatically adjust the high beams of the vehicle's headlights based on surrounding traffic conditions, improving visibility for the driver without blinding other drivers on the road. When this code is triggered, it means that there is a fault or malfunction in the automatic high beam mirror system, which can affect the overall performance of the vehicle.

OBDII Code B124A Lexus - Automatic High Beam Mirror
B124A Lexus Code - Automatic High Beam Mirror

Common Causes of B124A Lexus

  1. Faulty sensors in the automatic high beam mirror system
  2. Wiring issues or electrical problems
  3. Malfunctioning control module
  4. Software glitches or programming errors
  5. Mechanical damage to the high beam mirror components

Symptoms of B124A Lexus

  1. High beams not turning on when needed
  2. High beams staying on when they should be turned off
  3. Erratic behavior in high beam adjustment
  4. Warning light illuminated on the dashboard

How to Fix B124A Lexus

  1. Begin by conducting a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the exact issue with the automatic high beam mirror system.
  2. Inspect the sensors, wiring, and control module for any visible damage or signs of wear. Replace any faulty components as needed.
  3. Check and recalibrate the automatic high beam mirror system to ensure proper functionality and alignment.
  4. Clear the trouble codes from the vehicle's system memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, consult a professional technician or dealership for further troubleshooting and repairs.

Cost to Fix B124A Lexus

The typical repair costs for addressing the B124A code on a Lexus with automatic high beam mirror issues can range from $200 to $500, depending on the extent of the problem and the specific components that need to be replaced. This estimate includes both parts and labor, but actual costs may vary based on factors such as location, vehicle make and model, and the expertise of the technician performing the repairs. It is recommended to obtain a detailed quote from a reputable auto repair shop or dealership for a more accurate cost estimate.

What does this mean?

Tech Notes for B124A Lexus

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera that was installed on another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

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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 B124A Lexus Code

1. What does the OBDII code B124A on a Lexus indicate?

- The code B124A on a Lexus indicates a fault in the Automatic High Beam Mirror system, which is part of the vehicle's advanced lighting system designed to automatically adjust the high beam headlights.

2. What symptoms might I notice if my Lexus has the B124A code?

- Symptoms of the B124A code typically include the automatic high beam feature not working, the high beam indicator light might blink or stay on continuously, and there may be an error message displayed on the dashboard.

3. What are common causes of the B124A code in a Lexus?

- Common causes for the B124A code include a malfunctioning automatic high beam sensor, damaged wiring or connectors related to the high beam system, or issues with the vehicle’s onboard computer.

4. How can I troubleshoot the B124A code in my Lexus?

- Troubleshooting the B124A code involves checking the automatic high beam sensor for any obstructions or damage, inspecting the wiring and connectors for damage, and using an OBDII scanner to further diagnose the problem.

5. What repair steps should be taken to fix the B124A code in a Lexus?

- Repair steps might include cleaning or replacing the automatic high beam sensor, repairing or replacing any damaged wiring or connectors, and possibly reprogramming or replacing the vehicle’s computer system if it is found to be faulty.

6. Is it safe to drive my Lexus with the B124A code?

- While it may be safe to drive with this code active, your high beams might not function properly, which could impair your visibility during night driving or in low-light conditions. It is advisable to address the issue promptly for safety.

7. Can I fix the B124A code on my Lexus myself?

- If you have experience with car electronics, you might be able to address simple issues like cleaning the sensor or checking the wiring. However, if the problem involves electrical faults or computer issues, professional service is recommended.

8. What tools are needed to diagnose the B124A code on a Lexus?

- Diagnosing the B124A code typically requires an OBDII scanner that can read Lexus-specific codes, a digital multimeter for testing wiring continuity, and basic hand tools for accessing the sensor and wiring.

9. How often does the B124A code occur in Lexus vehicles?

- The frequency of the B124A code can vary based on model and usage but is generally not very common. Issues may arise due to specific circumstances like sensor blockage or electrical system malfunctions.

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