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B1790 Toyota Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

Quick Answer

The B1790 Toyota diagnostic trouble code (DTC) refers to a Center Airbag Sensor Assembly Communication Circuit Malfunction. Common causes include Damaged wiring or connectors in the airbag system, Faulty center airbag sensor assembly, Issues with the vehicle's electronic control unit (ECU). 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 Toyota indicates Center Airbag Sensor Assembly Communication Circuit Malfunction.
Common causes
Common causes include Damaged wiring or connectors in the airbag system, Faulty center airbag sensor assembly, Issues with the vehicle's electronic control unit (ECU).
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 07, 2024
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Code B1790 Toyota Description

The B1790 Toyota diagnostic trouble code (DTC) refers to a Center Airbag Sensor Assembly Communication Circuit Malfunction. In modern vehicles, airbags are crucial safety features designed to deploy in the event of a collision, providing protection for occupants. The center airbag sensor assembly is a critical component of the vehicle's airbag system, responsible for detecting impacts and sending signals to deploy the airbags when necessary.

OBDII Code B1790 Toyota - Center Airbag Sensor Assembly Communication Circuit Malfunction
B1790 Toyota Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

Common Causes of B1790 Toyota

  1. Damaged wiring or connectors in the airbag system
  2. Faulty center airbag sensor assembly
  3. Issues with the vehicle's electronic control unit (ECU)
  4. Corrosion or moisture in the airbag system components
  5. Impact or collision that damaged the airbag system

Symptoms of B1790 Toyota

  1. Airbag warning light illuminated on the dashboard
  2. Airbags not deploying in a collision
  3. Inconsistent or delayed airbag deployment
  4. Intermittent loss of communication with the airbag system
  5. Vehicle failing airbag system self-tests

How to Fix B1790 Toyota

  1. Consult the vehicle's service manual for specific diagnostic procedures related to the B1790 code
  2. Inspect the wiring and connectors in the airbag system for damage or corrosion
  3. Test the center airbag sensor assembly for proper functionality
  4. Check for any loose connections or poor grounding in the airbag system
  5. Clear the DTC and reset the airbag system to see if the code reappears after repairs

Cost to Fix B1790 Toyota

The typical repair costs for addressing a B1790 Toyota code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost can range from $200 to $600, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Rates may range from $80 to $150 per hour, with higher rates at dealerships or in metropolitan areas and potentially lower rates at independent shops. For a more precise estimate, it's recommended to obtain quotes from local auto repair shops.

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Information for Specific Toyota Models

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 Toyota Code

1. What are the common symptoms of OBDII code B1790 in a Toyota?

- Common symptoms include the airbag warning light illuminating on the dashboard and possible non-deployment of the airbags in case of an accident.

2. What can cause the Center Airbag Sensor Assembly Communication Circuit Malfunction in a Toyota?

- The most common causes of this OBDII code are wiring issues, faulty connections, or a malfunctioning center airbag sensor assembly.

3. How serious is the B1790 code in a Toyota?

- The B1790 code should be taken seriously as it indicates a malfunction in the airbag system, which can compromise the safety of the vehicle occupants in the event of a collision.

4. Can I continue driving my Toyota with the B1790 code present?

- It is not recommended to drive the vehicle with the B1790 code present, as it can lead to potential airbag system failure in case of an accident.

5. How can I diagnose and repair the Center Airbag Sensor Assembly Communication Circuit Malfunction in my Toyota?

- Diagnosing and repairing this issue typically involves checking the wiring and connections associated with the center airbag sensor assembly, as well as testing the sensor itself for any malfunctions.

6. Can I reset the B1790 code in my Toyota by simply clearing the fault codes?

- While clearing the fault codes may temporarily turn off the warning light, the underlying issue causing the B1790 code will persist unless properly diagnosed and repaired.

7. Are there any safety precautions I should take when working on the airbag system to address the B1790 code?

- It is highly recommended to disconnect the vehicle's battery and wait for at least 10 minutes before working on the airbag system to prevent accidental deployment.

8. How much does it typically cost to repair the B1790 code in a Toyota?

- The cost of repairing the B1790 code can vary depending on the root cause of the issue, but it may involve expenses for diagnostic time, parts replacement, and labor.

9. Can I fix the Center Airbag Sensor Assembly Communication Circuit Malfunction in my Toyota by myself, or should I seek professional help?

- While some DIY enthusiasts may attempt to diagnose and repair this issue, it is recommended to seek professional help, especially when working with the vehicle's airbag system for safety reasons.

10. Will fixing the B1790 code in my Toyota require reprogramming or recalibrating the airbag system?

- Depending on the repair performed, it may be necessary to reprogram or recalibrate the airbag system to ensure proper functionality and reset any stored error codes.

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