AutoCodes – Lexus – B1790 Lexus

B1790 Lexus Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

Quick Answer

The Center Airbag Sensor Assembly Communication Circuit consists of the Occupant Classification ECU and the Center Airbag Sensor Assembly. Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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: B1790 Lexus indicates Center Airbag Sensor Assembly Communication Circuit Malfunction.
Common causes: Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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 3,668

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 Oct 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1790 Lexus Description

The Center Airbag Sensor Assembly Communication Circuit consists of the Occupant Classification ECU and the Center Airbag Sensor Assembly. The Diagnostic Trouble Code (DTC) B1790 is recorded when a malfunction is detected in the Center Airbag Sensor Assembly Communication Circuit.

OBDII Code B1790 Lexus - Center Airbag Sensor Assembly Communication Circuit Malfunction - AutoCodes.com — B1790 Lexus Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1790 Lexus?

Faulty Occupant Detection ECU
Occupant Detection ECU harness is open or shorted
Occupant Detection ECU circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1790 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 B1790 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 B1790 Lexus code?

Need more information on how to fix the B1790 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1790 Lexus code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1790 Lexus Code

1. What are the common symptoms of OBDII code B1790 in a Lexus related to the Center Airbag Sensor Assembly Communication Circuit Malfunction?

- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the airbag system's functionality.

2. What are some possible causes of the B1790 error code in a Lexus center airbag sensor assembly communication circuit malfunction?

- The code may be triggered by wiring issues, loose connections, a faulty center airbag sensor assembly, or a malfunctioning airbag control module.

3. How can I diagnose the B1790 code in my Lexus for the center airbag sensor assembly communication circuit malfunction?

- Diagnosing this code typically involves using an OBDII scanner to read the specific error code, checking the wiring and connectors for any visible damage, and testing the components related to the airbag system.

4. Can I drive my Lexus with the B1790 error code related to the center airbag sensor assembly communication circuit malfunction?

- It is not recommended to drive the vehicle with this error code present, as it indicates a potential issue with the airbag system's communication, which could affect its proper functionality in case of an accident.

5. How can I repair the B1790 code in my Lexus for the center airbag sensor assembly communication circuit malfunction?

- Repairing this code may involve fixing any damaged wiring or connectors, replacing the faulty center airbag sensor assembly or airbag control module, and clearing the error code with an OBDII scanner.

6. Is it necessary to reset the airbag system after fixing the B1790 error code in a Lexus?

- Yes, it is important to reset the airbag system after repairing the issue related to the center airbag sensor assembly communication circuit malfunction to ensure that the system is functioning properly.

7. Are there any safety precautions to consider when working on the airbag system to address the B1790 code in a Lexus?

- When working on the airbag system, it is crucial to disconnect the vehicle's battery, wait for at least 10-15 minutes to discharge any residual power, and handle the components with care to avoid accidental deployment.

8. How can I prevent the recurrence of the B1790 error code in my Lexus center airbag sensor assembly communication circuit?

- Regularly inspecting the airbag system components, ensuring proper wiring connections, and addressing any warning lights promptly can help prevent the recurrence of the B1790 error code.

9. Can a DIY enthusiast with some automotive knowledge fix the B1790 error code related to the center airbag sensor assembly communication circuit malfunction in a Lexus?

- While some basic troubleshooting and repairs can be done by DIY enthusiasts, dealing with airbag system issues can be complex and dangerous, so it is recommended to consult a qualified mechanic for proper diagnosis and repair.

10. How long does it typically take to repair the B1790 error code in a Lexus center airbag sensor assembly communication circuit malfunction?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a couple of hours to a full day to diagnose, fix, and reset the airbag system related to the B1790 error code.