AutoCodes – Lexus – B1207 Lexus

B1207 Lexus Code - Multiplex Communication System

Quick Answer

The Certification ECU communicates with the Transponder Key to verified that the Key has been registered to the vehicle. Common causes include Faulty Certification ECU, Certification ECU harness is open or shorted, Certification ECU circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B1207 Lexus indicates Multiplex Communication System.
Common causes: Common causes include Faulty Certification ECU, Certification ECU harness is open or shorted, Certification ECU circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 7,194

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 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
Cost to Diagnose
FAQs
Comments
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Code B1207 Lexus Description

The Certification ECU communicates with the Transponder Key to verified that the Key has been registered to the vehicle. The Engine Control Module (ECM) sets the ODBII code when communication between the Certification ECU and gateway ECU stops for more than 10 seconds.

OBDII Code B1207 Lexus - Multiplex Communication System - AutoCodes.com — B1207 Lexus Code - Multiplex Communication System

What does this mean?

What are the Possible Causes of the DTC B1207 Lexus?

Faulty Certification ECU
Certification ECU harness is open or shorted
Certification ECU circuit poor electrical connection

How to Fix the DTC B1207 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 B1207 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.

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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 B1207 Lexus Code

1. What does the OBDII code B1207 indicate on a Lexus?

The B1207 code on a Lexus indicates a fault in the Multiplex Communication System, particularly pointing to an issue with the communication between different modules within the vehicle.

2. What are common symptoms of code B1207 in a Lexus?

Common symptoms include malfunctioning interior lights, issues with the audio or navigation system, erratic behavior of the instrument cluster, and possibly the vehicle not starting.

3. What causes the B1207 code to appear on a Lexus?

This code can be triggered by various issues such as faulty control modules, damaged wiring harnesses, poor module ground connections, or problems with the network communication bus.

4. How is the B1207 error diagnosed in a Lexus?

Diagnosing this error involves using a scan tool to check for communication faults between modules, visually inspecting wiring and connectors, and possibly testing individual modules to isolate the faulty component.

5. What are the steps to fix the B1207 code on a Lexus?

Repair steps can include repairing or replacing damaged wiring, ensuring all connections are secure, replacing faulty modules if necessary, and resetting the vehicle's communication network.

6. Can I drive my Lexus with the B1207 code active?

While the vehicle might still operate, driving with the B1207 code can lead to increased inconvenience due to potential malfunctions of various electronic systems, and it is advisable to address the issue promptly.

7. Does the B1207 code affect the overall performance of the Lexus?

Yes, while it primarily affects communication among electronic modules, related symptoms can indirectly influence vehicle performance, especially if key modules like the ECM (Engine Control Module) are involved.

8. What tools are required to diagnose the B1207 code on a Lexus?

Diagnosing this code typically requires a professional-grade OBDII scanner capable of reading manufacturer-specific codes and viewing live data, as well as possibly a multimeter and oscilloscope for more detailed electrical testing.

9. How long does it typically take to diagnose and fix the B1207 code in a Lexus?

The time can vary significantly based on the specific cause of the fault. Diagnosis can take from 1 to 3 hours, and repair time depends on the complexity of the issue, ranging from a simple connector fix to replacing modules, which could take additional hours.