AutoCodes – Lexus – B124B Lexus

B124B Lexus Code - Automatic High Beam System

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when the Main Body ECU (Multiplex Network Body ECU) detects a malfunction in the Forward Recognition Camera. Common causes include Faulty Forward Recognition Camera, Forward Recognition Camera harness is open or shorted, Forward Recognition Camera circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B124B Lexus indicates Automatic High Beam System.
Common causes: Common causes include Faulty Forward Recognition Camera, Forward Recognition Camera harness is open or shorted, Forward Recognition Camera circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,853

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B124B Lexus Description

This Diagnostic Trouble Code (DTC) is stored when the Main Body ECU (Multiplex Network Body ECU) detects a malfunction in the Forward Recognition Camera.

OBDII Code B124B Lexus - Automatic High Beam System - AutoCodes.com — B124B Lexus Code - Automatic High Beam System

What does this mean?

What are the Possible Causes of the DTC B124B Lexus?

Faulty Forward Recognition Camera
Forward Recognition Camera harness is open or shorted
Forward Recognition Camera circuit poor electrical connection
Faulty Main Body ECU (Multiplex Network Body ECU)

How to Fix the DTC B124B Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B124B Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 B124B Lexus Code

1. What does OBDII code B124B for Lexus Automatic High Beam System mean?

- OBDII code B124B indicates a malfunction in the Automatic High Beam System of a Lexus vehicle.

2. What are the common symptoms of OBDII code B124B in a Lexus?

- Common symptoms of OBDII code B124B may include the automatic high beams not functioning properly, failure to switch between high and low beams, or a dashboard warning light related to the system.

3. What are the possible causes of OBDII code B124B in a Lexus?

- The possible causes of OBDII code B124B in a Lexus include faulty sensors, wiring issues, a defective control module, or a problem with the automatic high beam system components.

4. How can I diagnose OBDII code B124B in my Lexus Automatic High Beam System?

- Diagnosing OBDII code B124B typically involves using an OBDII scanner to retrieve the code, inspecting the automatic high beam system components for visible damage, and testing sensors and wiring for proper functionality.

5. Can I still drive my Lexus with OBDII code B124B present?

- It is generally safe to drive your Lexus with OBDII code B124B present, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure the proper functioning of the Automatic High Beam System.

6. How can I reset OBDII code B124B in my Lexus?

- Resetting OBDII code B124B in your Lexus can be done using an OBDII scanner to clear the code after the underlying issue with the Automatic High Beam System has been addressed.

7. Are there any DIY repair tips for fixing OBDII code B124B in a Lexus?

- DIY repair tips for addressing OBDII code B124B in a Lexus may include checking and cleaning sensor connections, inspecting wiring for damage, and ensuring all components of the Automatic High Beam System are properly connected and functioning.

8. Is it recommended to seek professional help for repairing OBDII code B124B in my Lexus?

- Due to the complexity of the Automatic High Beam System and potential safety implications, it is recommended to seek professional help from a certified mechanic or Lexus dealership to diagnose and repair OBDII code B124B.

9. Can OBDII code B124B in a Lexus be caused by a simple issue like a blown fuse?

- Yes, OBDII code B124B in a Lexus can sometimes be triggered by a blown fuse affecting the Automatic High Beam System. Checking and replacing any blown fuses is a good first step in troubleshooting the issue.

10. How much does it typically cost to repair OBDII code B124B in a Lexus?

- The cost to repair OBDII code B124B in a Lexus can vary depending on the underlying cause of the issue, the extent of the damage, and labor costs. It is advisable to obtain a diagnostic and repair estimate from a professional technician.