AutoCodes – Toyota – B1249 Toyota

B1249 Toyota 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 Toyota 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 10,315

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

What does this mean?

What are the Possible Causes of the DTC B1249 Toyota?

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

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Get the B1249 Toyota code diagnosed by a professional: Find a repair shop in your area

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 Toyota Code

1. What does OBDII code B1249 for Toyota mean?

- OBDII code B1249 indicates a communication failure with the Double Locking ECU in a Toyota vehicle.

2. What are the common symptoms of a Double Locking ECU Communication Stop issue?

- Common symptoms include power door locks not working, inability to lock or unlock the doors remotely, and warning lights on the dashboard.

3. What can cause the Double Locking ECU Communication Stop problem in a Toyota?

- Possible causes include wiring issues, a faulty Double Locking ECU, blown fuses, or a malfunctioning body control module.

4. How can I diagnose the B1249 code related to Double Locking ECU communication issues?

- Diagnose the problem by checking for blown fuses, inspecting the wiring for damage, and using a diagnostic scanner to communicate with the Double Locking ECU.

5. Can I still drive my Toyota with the B1249 code present?

- It is generally safe to drive the vehicle with the B1249 code, but you may experience issues with the power door locks and remote locking functionality.

6. How can I repair a Double Locking ECU Communication Stop problem in my Toyota?

- Repair options include fixing damaged wiring, replacing blown fuses, repairing or replacing the Double Locking ECU, or addressing any issues with the body control module.

7. Is it possible to reset the B1249 code without fixing the underlying issue?

- While you can clear the code with a diagnostic scanner, the underlying problem causing the code will persist until it is properly diagnosed and repaired.

8. Are there any DIY tips for troubleshooting the B1249 code in my Toyota?

- DIY tips include checking for visible wiring damage, ensuring all fuses related to the power door locks are intact, and attempting to reset the system by disconnecting the battery.

9. How much does it cost to repair a Double Locking ECU Communication Stop issue in a Toyota?

- The cost of repair can vary depending on the specific cause of the problem, but it may involve expenses for parts, labor, and diagnostic services.

10. Can I prevent the B1249 code from occurring in the future?

- Regular vehicle maintenance, checking the condition of the wiring harness, and addressing any electrical issues promptly can help prevent the recurrence of the Double Locking ECU Communication Stop problem.