AutoCodes – Toyota – B1242 Toyota

B1242 Toyota Code - Wireless Door Lock Tuner Circuit Malfunction

Quick Answer

The Door Control Receiver is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. Common causes include Faulty Door Control Receiver, Door Control Receiver harness is open or shorted, Door Control Receiver circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1242 Toyota indicates Wireless Door Lock Tuner Circuit Malfunction.
Common causes: Common causes include Faulty Door Control Receiver, Door Control Receiver harness is open or shorted, Door Control Receiver circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 23,916

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 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
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1242 Toyota Description

The Door Control Receiver is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the door control receiver. The door control receiver receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (For example, if a door lock operation is requested, the certification ECU [smart key ECU assembly] sends a door lock command to the main body ECU [multiplex network body ECU]).

OBDII Code B1242 Toyota - Wireless Door Lock Tuner Circuit Malfunction - AutoCodes.com — B1242 Toyota Code - Wireless Door Lock Tuner Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1242 Toyota?

Faulty Door Control Receiver
Door Control Receiver harness is open or shorted
Door Control Receiver circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B1242 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1242 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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Information for Specific Toyota Models

B1242 2013 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction
B1242 2014 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction
B1242 2015 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction
B1242 2016 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction
B1242 2017 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction
B1242 2018 Toyota RAV4 — Wireless Door Lock Tuner Circuit Malfunction

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 B1242 Toyota Code

1. What are the common symptoms of OBDII code B1242 in a Toyota related to the Wireless Door Lock Tuner Circuit Malfunction?

- Common symptoms include difficulty locking or unlocking doors wirelessly, inoperative key fob, and intermittent issues with the central locking system.

2. What are the possible causes of the B1242 code indicating a Wireless Door Lock Tuner Circuit Malfunction in a Toyota?

- The code B1242 can be triggered by issues such as a faulty door lock actuator, damaged wiring in the door harness, a malfunctioning key fob, or a problem with the central locking module.

3. How can I diagnose the cause of the B1242 code in my Toyota related to the Wireless Door Lock Tuner Circuit Malfunction?

- To diagnose the issue, you can start by checking the condition of the key fob batteries, inspecting the wiring in the door harness for any visible damage, and testing the door lock actuators for proper function.

4. Is it safe to continue driving my Toyota with the B1242 code indicating a Wireless Door Lock Tuner Circuit Malfunction?

- While the vehicle should still be safe to drive with this code, it is recommended to address the issue promptly to ensure the proper functioning of the door locking system for convenience and security.

5. Can I repair the B1242 code related to the Wireless Door Lock Tuner Circuit Malfunction in my Toyota myself?

- Depending on your level of automotive expertise, you may be able to address the issue yourself by replacing a faulty door lock actuator, repairing damaged wiring, or reprogramming the key fob. However, seeking professional help is recommended for accurate diagnosis and repair.

6. How much does it typically cost to repair the B1242 code in a Toyota for the Wireless Door Lock Tuner Circuit Malfunction?

- The cost of repairing the B1242 code can vary depending on the specific cause of the issue. Simple fixes like replacing key fob batteries may be inexpensive, while repairing or replacing door lock actuators or addressing wiring issues can be more costly.

7. Can resetting the vehicle's computer system clear the B1242 code related to the Wireless Door Lock Tuner Circuit Malfunction in a Toyota?

- Resetting the computer system may temporarily clear the code, but it is unlikely to resolve the underlying issue causing the malfunction. It is best to diagnose the problem and address it directly to prevent future occurrences.

8. Are there any preventive maintenance tips to avoid encountering the B1242 code in a Toyota for the Wireless Door Lock Tuner Circuit Malfunction?

- Regularly checking the condition of key fob batteries, inspecting door harness wiring for wear or damage, and addressing any door lock issues promptly can help prevent the occurrence of the B1242 code in your Toyota.

9. Will the B1242 code related to the Wireless Door Lock Tuner Circuit Malfunction cause any other electrical problems in my Toyota?

- While the B1242 code typically indicates a specific issue with the door locking system, it may not directly cause other electrical problems. However, addressing the code promptly is important to prevent any potential complications or failures in the vehicle's electrical system.

10. How long does it usually take to repair the B1242 code in a Toyota for the Wireless Door Lock Tuner Circuit Malfunction?

- The repair time for the B1242 code can vary depending on the specific cause of the issue and the complexity of the repair needed. Simple fixes may take a short amount of time, while more involved repairs could require several hours or even a day to complete.