AutoCodes – Toyota – B1794 Toyota

B1794 Toyota Code - Open In Occupant Classification ECU Battery Positive Line

Quick Answer

This circuit consists of the Occupant Classification ECU and the power source circuit (battery, fuse, wire harness). 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: B1794 Toyota indicates Open In Occupant Classification ECU Battery Positive Line.
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 14,462

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1794 Toyota Description

This circuit consists of the Occupant Classification ECU and the power source circuit (battery, fuse, wire harness). The Diagnostic Trouble Code (DTC) B1794 is recorded when a malfunction is detected in the Occupant Classification ECU or the power source circuit. When DTC B1794 is output after switching the ignition switch LOCK-ON-LOCK 50 times in a row when a malfunction occurs in the power circuit for the occupant classification system, the DTC is output again when a malfunction is detected even once after being cleared, unless the normal system code is input.

OBDII Code B1794 Toyota - Open In Occupant Classification ECU Battery Positive Line - AutoCodes.com — B1794 Toyota Code - Open In Occupant Classification ECU Battery Positive Line

What does this mean?

What are the Possible Causes of the DTC B1794 Toyota?

Faulty Occupant Detection ECU
Occupant Detection ECU harness is open or shorted
Occupant Detection ECU circuit poor electrical connection

How to Fix the DTC B1794 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 B1794 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 B1794 Toyota code?

Need more information on how to fix the B1794 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1794 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

B1794 2013 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line
B1794 2014 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line
B1794 2015 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line
B1794 2016 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line
B1794 2017 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line
B1794 2018 Toyota RAV4 — Open In Occupant Classification ECU Battery Positive Line

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 B1794 Toyota Code

1. What are the common symptoms of OBDII code B1794 in a Toyota related to an open in the Occupant Classification ECU battery positive line?

The common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the vehicle's airbag system.

2. What could cause the Open In Occupant Classification ECU Battery Positive Line (B1794) code in a Toyota?

The code B1794 can be triggered by a damaged wiring harness, loose connections, or a malfunctioning Occupant Classification Electronic Control Unit (ECU).

3. How can I diagnose the Open In Occupant Classification ECU Battery Positive Line fault in my Toyota?

To diagnose the issue, you can use an OBDII scanner to retrieve the specific B1794 code and then inspect the wiring harness and connections leading to the Occupant Classification ECU for any visible damage or loose connections.

4. Is it safe to drive my Toyota with the B1794 code related to an open in the Occupant Classification ECU battery positive line?

It is not recommended to drive the vehicle with the B1794 code present, as it indicates a potential issue with the airbag system, which could compromise passenger safety in the event of a collision.

5. Can I repair the Open In Occupant Classification ECU Battery Positive Line issue in my Toyota myself?

Depending on your level of automotive expertise, you may be able to address the issue yourself by inspecting and repairing any damaged wiring or connections. However, it is advisable to seek professional help if you are unsure.

6. What are the repair options for fixing the B1794 code in a Toyota due to an open in the Occupant Classification ECU battery positive line?

Repair options include repairing or replacing the damaged wiring harness, fixing any loose connections, or replacing the Occupant Classification ECU if it is found to be faulty.

7. How much does it typically cost to repair the B1794 code in a Toyota caused by an open in the Occupant Classification ECU battery positive line?

The cost of repair can vary depending on the extent of the damage and whether any components need to be replaced. It is recommended to obtain quotes from auto repair shops for an accurate estimate.

8. Can the B1794 code related to an open in the Occupant Classification ECU battery positive line be a recurring issue in a Toyota?

If the underlying cause of the code, such as wiring damage or ECU malfunction, is not properly addressed during the repair, the B1794 code may reappear. It is essential to ensure a thorough diagnosis and repair.

9. Are there any safety precautions to take when working on the Open In Occupant Classification ECU Battery Positive Line issue in a Toyota?

When working on the airbag system or related components, it is crucial to disconnect the vehicle's battery and wait for a few minutes to allow the system to discharge fully. This helps prevent accidental airbag deployment.

10. How long does it typically take to repair the B1794 code in a Toyota linked to an open in the Occupant Classification ECU battery positive line?

The repair time can vary based on the complexity of the issue and the availability of parts. Simple fixes like repairing a wire may take less time, while replacing the Occupant Classification ECU could require more labor.