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Engine-Codes – Scion – B1249 Scion

B1249 Scion Code - Double Locking ECU Communication Stop

Quick Answer

The B1249 Scion code indicates a communication stop between the Double Locking ECU (Electronic Control Unit) and other vehicle systems. Common causes include Faulty wiring or connectors leading to a communication stop, Malfunctioning Double Locking ECU, Water damage or corrosion affecting the electronic components. 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 Scion indicates Double Locking ECU Communication Stop.
Common causes
Common causes include Faulty wiring or connectors leading to a communication stop, Malfunctioning Double Locking ECU, Water damage or corrosion affecting the electronic components.
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 B1249 Scion Description

The B1249 Scion code indicates a communication stop between the Double Locking ECU (Electronic Control Unit) and other vehicle systems. The Double Locking ECU is responsible for managing the vehicle's double locking system, which enhances security by preventing the doors from being unlocked from the inside. When communication with this ECU is interrupted, it can lead to issues with the double locking system, potentially compromising the vehicle's security.

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

Common Causes of B1249 Scion

  1. Faulty wiring or connectors leading to a communication stop.
  2. Malfunctioning Double Locking ECU.
  3. Water damage or corrosion affecting the electronic components.
  4. Electrical interference from aftermarket accessories or modifications.
  5. Software issues causing communication errors.

Symptoms of B1249 Scion

  1. Difficulty locking or unlocking the doors.
  2. Unresponsive key fob or central locking button.
  3. Dashboard warning lights related to the security system.
  4. Inability to activate the double locking system.

How to Fix B1249 Scion

  1. Begin by conducting a thorough inspection of the wiring and connectors associated with the Double Locking ECU.
  2. Test the Double Locking ECU for proper functionality and communication with other vehicle systems.
  3. Check for any signs of water damage or corrosion and address any issues found.
  4. Clear the diagnostic trouble codes and reset the system to see if the issue reoccurs.
  5. If necessary, replace the Double Locking ECU or repair any damaged wiring or connectors.

Cost to Fix B1249 Scion

The typical repair costs for addressing a B1249 Scion code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new Double Locking ECU or wiring components can range from $200 to $500. Labor costs for diagnosis and repair can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It's advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of the vehicle.

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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 Scion Code

1. What does OBDII code B1249 for Scion Double Locking ECU Communication Stop mean?

The code B1249 indicates a communication error between the Double Locking ECU (Electronic Control Unit) and other vehicle systems in a Scion.

2. What are the common symptoms of OBDII code B1249 in a Scion?

Common symptoms include issues with the vehicle's central locking system, immobilizer system, and key fob functionality.

3. What are the possible causes of OBDII code B1249 in a Scion?

Potential causes include faulty wiring or connectors in the central locking system, a malfunctioning Double Locking ECU, or a communication error within the vehicle's network.

4. How can I diagnose OBDII code B1249 in my Scion?

Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connectors related to the Double Locking ECU, and performing a thorough inspection of the central locking system.

5. Can I repair OBDII code B1249 in my Scion at home?

While simple issues like loose connectors or blown fuses can be addressed at home, complex issues with the Double Locking ECU or wiring may require professional diagnosis and repair.

6. Are there any safety concerns associated with OBDII code B1249 in a Scion?

Since this code can affect important vehicle systems like the central locking and immobilizer, it is recommended to address the issue promptly to ensure the security and functionality of the vehicle.

7. Will resetting the OBDII code B1249 in my Scion make the problem go away?

Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the communication stop between the Double Locking ECU and other systems.

8. How much does it cost to repair OBDII code B1249 in a Scion?

The cost of repair can vary depending on the exact cause of the issue. It is advisable to consult with a professional mechanic for an accurate diagnosis and cost estimate.

9. Can OBDII code B1249 in a Scion cause the vehicle to become inoperable?

While the vehicle may still be operable with this code present, it can lead to inconvenience and potential issues with the central locking and immobilizer systems.

10. Is it safe to continue driving my Scion with OBDII code B1249 unresolved?

It is generally not recommended to drive the vehicle with unresolved OBDII codes, as they can indicate underlying problems that may affect the vehicle's performance and safety.

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