AutoCodes – Toyota – B124D Toyota

B124D Toyota Code - Lost Communication With AFS LIN

Quick Answer

The Diagnostic Trouble Code (DTC) is set when the Main Body ECU detects malfunctions in the LIN communication system. Common causes include Faulty Inner Rear View Mirror, Inner Rear View Mirror harness is open or shorted, Inner Rear View Mirror circuit poor electrical connection. 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: B124D Toyota indicates Lost Communication With AFS LIN.
Common causes: Common causes include Faulty Inner Rear View Mirror, Inner Rear View Mirror harness is open or shorted, Inner Rear View Mirror circuit poor electrical connection.
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.

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Code Popularity 3,557

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 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 B124D Toyota Description

The Diagnostic Trouble Code (DTC) is set when the Main Body ECU detects malfunctions in the LIN communication system.

OBDII Code B124D Toyota - Lost Communication With AFS LIN - AutoCodes.com — B124D Toyota Code - Lost Communication With AFS LIN

What does this mean?

What are the Possible Causes of the DTC B124D Toyota?

Faulty Inner Rear View Mirror
Inner Rear View Mirror harness is open or shorted
Inner Rear View Mirror circuit poor electrical connection
Faulty Adaptive Front-lighting System (AFS) ECU

How to Fix the DTC B124D Toyota?

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 B124D Toyota 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 B124D Toyota Code

1. What does the OBDII code B124D Toyota "Lost Communication With AFS LIN" indicate?

The code B124D indicates a communication error between the vehicle's computer system and the Adaptive Front Lighting System (AFS) LIN (Local Interconnect Network).

2. What are common symptoms of the B124D code?

Common symptoms include the AFS system not functioning properly, warning lights on the dashboard, and potential issues with headlight adjustments.

3. What are possible causes of the "Lost Communication With AFS LIN" code?

Possible causes include damaged wiring or connectors, a faulty AFS control module, a malfunctioning AFS actuator, or a problem with the LIN bus communication network.

4. How can I diagnose the B124D code?

Diagnosing the B124D code involves using a diagnostic scan tool to retrieve the code, checking the AFS system components for physical damage, and testing the wiring and connectors for continuity.

5. How can I repair the "Lost Communication With AFS LIN" issue?

Repairing the issue may involve repairing or replacing damaged wiring or connectors, replacing the AFS control module or actuator if faulty, or reprogramming the AFS system to restore communication.

6. Can I drive my vehicle with the B124D code present?

It is not recommended to drive your vehicle with the B124D code present, as it may affect the proper functioning of the AFS system and compromise safety.

7. How much does it cost to fix the B124D code?

The cost of fixing the B124D code can vary depending on the specific issue causing the communication error, the labor rates of the repair shop, and the cost of any replacement parts needed.

8. Is the B124D code specific to Toyota vehicles?

Yes, the B124D code specifically relates to Toyota vehicles and their Adaptive Front Lighting System (AFS) LIN communication.

9. Can I reset the B124D code without fixing the underlying issue?

While you can clear the code with a diagnostic scan tool, it is important to address the underlying issue causing the communication error to prevent it from recurring.

10. How long does it take to repair the "Lost Communication With AFS LIN" problem?

The repair time for the B124D code can vary depending on the specific cause of the issue, the availability of parts, and the expertise of the technician, but it may take a few hours to a full day.