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B124A 2018 Toyota RAV4 Code - Automatic High Beam Mirror

Quick Answer

The B124A diagnostic trouble code (DTC) for a 2018 Toyota RAV4 specifically relates to the Automatic High Beam Mirror system. Common causes include Faulty sensor in the automatic high beam mirror system, Wiring issues or loose connections, 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 2018 Toyota RAV4 indicates Automatic High Beam Mirror.
Common causes
Common causes include Faulty sensor in the automatic high beam mirror system, Wiring issues or loose connections, 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 17, 2024
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Code B124A 2018 Toyota RAV4 Description

The B124A diagnostic trouble code (DTC) for a 2018 Toyota RAV4 specifically relates to the Automatic High Beam Mirror system. This code indicates a malfunction in the automatic high beam mirror system, which is responsible for automatically adjusting the high beams of the vehicle's headlights based on surrounding light conditions. When this system fails, it can impact the driver's visibility at night, potentially leading to safety concerns.

OBDII Code B124A 2018 Toyota RAV4 - Automatic High Beam Mirror
B124A 2018 Toyota RAV4 Code - Automatic High Beam Mirror

Common Causes of B124A 2018 Toyota RAV4

  1. Faulty sensor in the automatic high beam mirror system
  2. Wiring issues or loose connections
  3. Malfunctioning control module
  4. Environmental factors such as dirt or debris obstructing sensors
  5. Electrical issues within the system

Symptoms of B124A 2018 Toyota RAV4

  1. Inconsistent high beam activation
  2. High beams not turning off when approaching other vehicles
  3. Diminished visibility at night
  4. Warning light on the dashboard indicating a high beam system malfunction

How to Fix B124A 2018 Toyota RAV4

  1. Begin by conducting a thorough diagnostic scan to confirm the B124A code and pinpoint the exact cause of the malfunction.
  2. Inspect the sensors, wiring, and control module associated with the automatic high beam mirror system for any visible damage or loose connections.
  3. Clean any sensors that may be obstructed by dirt or debris, ensuring they can accurately detect surrounding light conditions.
  4. Replace any faulty sensors, wiring, or control modules identified during the diagnostic process.
  5. Clear the DTC from the vehicle's system and test the automatic high beam mirror system to ensure proper functionality.

Cost to Fix B124A 2018 Toyota RAV4

The cost of repairing the Automatic High Beam Mirror system can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this type of issue can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary significantly based on location, vehicle make and model, and the expertise of the technicians. It's advisable to consult with a trusted mechanic or dealership to get a more accurate estimate for the repair.

What does this mean?

Tech Notes for B124A 2018 Toyota RAV4

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 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.

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