AutoCodes – Lexus – B1249 Lexus

B1249 Lexus Code - Double Locking ECU Communication Stop

Quick Answer

The Diagnostic Trouble Code (DTC) B1249 is stored when communication between the Double Lock Door Control Relay and Main Body ECU stops for more than 10 seconds. Common causes include Faulty Double Lock Door Control Relay, Double Lock Door Control Relay harness is open or shorted, Double Lock Door Control Relay 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: B1249 Lexus indicates Double Locking ECU Communication Stop.
Common causes: Common causes include Faulty Double Lock Door Control Relay, Double Lock Door Control Relay harness is open or shorted, Double Lock Door Control Relay 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 4,461

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 B1249 Lexus Description

The Diagnostic Trouble Code (DTC) B1249 is stored when communication between the Double Lock Door Control Relay and Main Body ECU stops for more than 10 seconds.

OBDII Code B1249 Lexus - Double Locking ECU Communication Stop - AutoCodes.com — B1249 Lexus Code - Double Locking ECU Communication Stop

What does this mean?

What are the Possible Causes of the DTC B1249 Lexus?

Faulty Double Lock Door Control Relay
Double Lock Door Control Relay harness is open or shorted
Double Lock Door Control Relay circuit poor electrical connection
Faulty Main Body ECU

How to Fix the DTC B1249 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 B1249 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.

Need more information about the B1249 Lexus code?

Need more information on how to fix the B1249 Lexus code? Get Access to Factory Service Manuals

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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.