AutoCodes – Toyota – B124A 2018 Toyota RAV4

B124A 2018 Toyota RAV4 Code - Automatic High Beam Mirror

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: B124A 2018 Toyota RAV4 indicates Automatic High Beam Mirror.
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 443

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B124A 2018 Toyota RAV4 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 B124A 2018 Toyota RAV4 - Automatic High Beam Mirror - AutoCodes.com — B124A 2018 Toyota RAV4 Code - Automatic High Beam Mirror

What does this mean?

What are the Possible Causes of the DTC B124A 2018 Toyota RAV4?

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 B124A 2018 Toyota RAV4?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B124A 2018 Toyota RAV4 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 B124A 2018 Toyota RAV4 Code

1. What does OBDII code B124A on a 2018 Toyota RAV4 Automatic High Beam Mirror indicate?

The code B124A specifically relates to a fault in the automatic high beam mirror system of the 2018 Toyota RAV4.

2. What are some common symptoms associated with OBDII code B124A on a 2018 Toyota RAV4?

Common symptoms include the automatic high beam function not working properly, the high beams staying on all the time, or the high beams failing to turn on when needed.

3. What are possible causes of OBDII code B124A on a 2018 Toyota RAV4?

Potential causes include a malfunctioning automatic high beam mirror module, wiring issues, faulty sensors, or a problem with the high beam mirror system's control circuit.

4. How can I diagnose the issue related to OBDII code B124A on my 2018 Toyota RAV4?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, conducting visual inspections of the automatic high beam mirror system components, and testing the system's operation.

5. Can I still drive my 2018 Toyota RAV4 with OBDII code B124A present?

While it is generally safe to drive with this code, it is recommended to have the issue diagnosed and repaired to ensure the proper functioning of the automatic high beam mirror system.

6. Are there any DIY repair tips for fixing OBDII code B124A on a 2018 Toyota RAV4?

DIY repair may include checking and securing wiring connections, inspecting the mirror module for damage, or replacing faulty sensors as needed. However, complex repairs may require professional assistance.

7. Is it necessary to reset the OBDII code B124A after repairing the issue on a 2018 Toyota RAV4?

Resetting the code is recommended after repairing the underlying issue to clear the fault code from the system and ensure proper functioning of the automatic high beam mirror system.

8. How much does it typically cost to repair OBDII code B124A on a 2018 Toyota RAV4?

Repair costs can vary depending on the specific cause of the issue. Simple fixes like replacing a sensor may be relatively inexpensive, while more complex repairs involving the mirror module or wiring could be costlier.

9. Can OBDII code B124A on a 2018 Toyota RAV4 be related to other vehicle systems or malfunctions?

While B124A specifically pertains to the automatic high beam mirror system, it is essential to address any related issues promptly to prevent potential complications with other vehicle systems.

10. How often does OBDII code B124A occur in a 2018 Toyota RAV4, and is it a common problem?

While the occurrence of this code may vary, issues with the automatic high beam mirror system leading to code B124A can be encountered in a 2018 Toyota RAV4, making it a relatively common problem that requires attention.