AutoCodes – Toyota – B1793 Toyota

B1793 Toyota Code - Occupant Classification Sensor Power Supply Circuit Malfunction

Quick Answer

The Occupant Classification Sensor power supply circuit consists of the Occupant Detection ECU and the occupant classification sensors. Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors), Separate Type Front Seat Cushion Spring Assembly harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly 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: B1793 Toyota indicates Occupant Classification Sensor Power Supply Circuit Malfunction.
Common causes: Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors), Separate Type Front Seat Cushion Spring Assembly harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly 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 2,476

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 B1793 Toyota Description

The Occupant Classification Sensor power supply circuit consists of the Occupant Detection ECU and the occupant classification sensors. The Diagnostic Trouble Code (DTC) B1793 is recorded when a malfunction is detected in the Occupant Classification Sensor Power Supply Circuit.

OBDII Code B1793 Toyota - Occupant Classification Sensor Power Supply Circuit Malfunction - AutoCodes.com — B1793 Toyota Code - Occupant Classification Sensor Power Supply Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1793 Toyota?

Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors)
Separate Type Front Seat Cushion Spring Assembly harness is open or shorted
Separate Type Front Seat Cushion Spring Assembly circuit poor electrical connection
Faulty Occupant Detection ECU

How to Fix the DTC B1793 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1793 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.

Need more information about the B1793 Toyota code?

Need more information on how to fix the B1793 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1793 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

B1793 2013 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction
B1793 2014 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction
B1793 2015 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction
B1793 2016 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction
B1793 2017 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction
B1793 2018 Toyota RAV4 — Occupant Classification Sensor Power Supply Circuit Malfunction

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 B1793 Toyota Code

1. What are the common symptoms of OBDII code B1793 Toyota?

- Common symptoms include the airbag warning light staying on, the passenger airbag being deactivated, and potential issues with the seatbelt warning system.

2. What does the OBDII code B1793 Toyota indicate?

- This code indicates a malfunction in the power supply circuit of the occupant classification sensor in a Toyota vehicle.

3. What are the possible causes of OBDII code B1793 Toyota?

- Possible causes include a faulty occupant classification sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning airbag control module.

4. How can I diagnose the OBDII code B1793 Toyota?

- Diagnosis involves using a code reader or scan tool to retrieve the specific fault code, inspecting the occupant classification sensor and related wiring for damage, and testing the sensor's power supply voltage.

5. How do I repair OBDII code B1793 Toyota?

- Repair may involve replacing the occupant classification sensor, repairing any damaged wiring or connectors, resetting the airbag control module, and clearing the fault code from the vehicle's computer.

6. Can I drive my Toyota with OBDII code B1793?

- It is not recommended to drive the vehicle with this code present, as it may affect the proper functioning of the airbag system and compromise passenger safety in the event of a collision.

7. Are there any safety precautions to take when working on OBDII code B1793 Toyota?

- It is important to disconnect the vehicle's battery before working on the airbag system to prevent accidental deployment and follow proper safety procedures outlined in the vehicle's service manual.

8. How common is OBDII code B1793 Toyota in Toyota vehicles?

- This code is relatively uncommon but can occur in certain Toyota models with occupant classification sensor issues, especially in vehicles with higher mileage or age.

9. Can I reset OBDII code B1793 Toyota without fixing the underlying issue?

- While you can clear the fault code with a scan tool, it is not recommended to do so without addressing the root cause, as it may lead to continued safety risks and potential failure of the airbag system.

10. How much does it cost to repair OBDII code B1793 Toyota at a dealership or repair shop?

- Repair costs can vary depending on the specific issue and labor rates, but replacing the occupant classification sensor or repairing wiring typically ranges from $200 to $600 at a dealership or repair shop.