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B1249 Lexus Code - Double Locking ECU Communication Stop

Quick Answer

The B1249 code for Lexus vehicles indicates a "Double Locking ECU Communication Stop" error. Common causes include Faulty wiring connections, Damaged double locking ECU, Software glitches. 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
B1249 Lexus indicates Double Locking ECU Communication Stop.
Common causes
Common causes include Faulty wiring connections, Damaged double locking ECU, Software glitches.
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 B1249 Lexus Description

The B1249 code for Lexus vehicles indicates a "Double Locking ECU Communication Stop" error. This means that there is a communication issue between the electronic control unit (ECU) responsible for the double locking system and other related modules in the vehicle. The double locking system is designed to provide an extra layer of security by locking the doors and preventing them from being opened from the inside. When this communication stop occurs, it can lead to malfunctions in the double locking system, potentially compromising the security of the vehicle.

OBDII Code B1249 Lexus - Double Locking ECU Communication Stop
B1249 Lexus Code - Double Locking ECU Communication Stop

Common Causes of B1249 Lexus

  1. Faulty wiring connections
  2. Damaged double locking ECU
  3. Software glitches
  4. Communication errors between modules
  5. Water damage or corrosion in the system

Symptoms of B1249 Lexus

  1. Doors not locking or unlocking properly
  2. Alarm system not functioning correctly
  3. Warning lights related to security system on the dashboard
  4. Remote key fob not working as expected

How to Fix B1249 Lexus

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and identify the source of the communication stop.
  2. Inspect the wiring connections and harnesses for any signs of damage or corrosion. Repair or replace as needed.
  3. Check the double locking ECU and related modules for any physical damage. Replace any faulty components.
  4. Reset the system and perform a reprogramming or software update if necessary to restore proper communication between modules.
  5. Test the double locking system to ensure it is functioning correctly after repairs.

Cost to Fix B1249 Lexus

The typical repair costs for addressing a B1249 code in a Lexus vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. As a rough estimate, the cost for parts and labor could range from $200 to $500. However, it is important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and the complexity of the repair. It is advisable to consult with a trusted mechanic or dealership to get a more accurate estimate for this particular issue.

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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 B1249 Lexus Code

1. What are the common symptoms of OBDII code B1249 Lexus (Double Locking ECU Communication Stop)?

- Common symptoms include difficulty starting the vehicle, power door locks not functioning properly, and warning lights illuminated on the dashboard.

2. What can cause the Double Locking ECU Communication Stop error code B1249 in a Lexus?

- The code B1249 can be caused by faulty wiring, a malfunctioning double locking ECU, or issues with the communication network between components.

3. How can I diagnose the Double Locking ECU Communication Stop code B1249 in my Lexus?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, checking the wiring connections related to the double locking ECU, and testing the ECU itself for proper functionality.

4. Can I drive my Lexus safely with the B1249 code present?

- It is not recommended to drive your Lexus with the B1249 code active, as it may affect critical systems like starting the vehicle and locking mechanisms.

5. How can I reset the Double Locking ECU Communication Stop code B1249 in my Lexus?

- Resetting the code usually involves fixing the underlying issue causing the fault, clearing the code with an OBDII scanner, and ensuring proper communication between the ECU and related components.

6. Are there any DIY repair tips for resolving the B1249 code in a Lexus?

- DIY repair tips may include checking and repairing damaged wiring, ensuring all connections are secure, and consulting the vehicle's service manual for specific troubleshooting steps.

7. How much does it cost to repair the Double Locking ECU Communication Stop issue in a Lexus?

- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing faulty components, repairing wiring, or reprogramming the ECU, potentially ranging from a few hundred to a couple thousand dollars.

8. Can a mechanic easily fix the B1249 code in a Lexus?

- A qualified mechanic with experience in automotive diagnostics should be able to diagnose and repair the B1249 code efficiently by following proper diagnostic procedures and utilizing specialized tools.

9. Will the B1249 code go away on its own in a Lexus?

- The B1249 code typically does not resolve on its own and requires proper diagnosis and repair to address the underlying issue causing the communication stop between the double locking ECU and other components.

10. Is the Double Locking ECU Communication Stop code B1249 a common issue in Lexus vehicles?

- While the B1249 code may not be as common as some other OBDII codes, it can still occur in Lexus vehicles due to various factors affecting the communication network and electronic systems.

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