AutoCodes – Toyota – B1785 2017 Toyota RAV4

B1785 2017 Toyota RAV4 Code - Front Occupant Classification Sensor Left Collision Detection

Quick Answer

The Diagnostic Trouble Code (DTC) B1785 is output when the Occupant Detection ECU receives a collision detection signal sent by the Front Occupant Classification Sensor Left (LH) when an accident occurs. Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly Left (Front Occupant Classification Sensor Left), Separate Type Front Seat Cushion Spring Assembly Left harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly Left 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: B1785 2017 Toyota RAV4 indicates Front Occupant Classification Sensor Left Collision Detection.
Common causes: Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly Left (Front Occupant Classification Sensor Left), Separate Type Front Seat Cushion Spring Assembly Left harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly Left 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 272

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 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1785 2017 Toyota RAV4 Description

The Diagnostic Trouble Code (DTC) B1785 is output when the Occupant Detection ECU receives a collision detection signal sent by the Front Occupant Classification Sensor Left (LH) when an accident occurs. DTC B1785 is also stored when the separate type of front seat cushion spring assembly is subjected to a strong impact, even if an actual accident has not occurred. However, when the Occupant Detection ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1785 can be cleared by performing the zero point calibration and sensitivity check. Therefore, when DTC B1785 is output, first perform the zero point calibration and sensitivity check.

OBDII Code B1785 2017 Toyota RAV4 - Front Occupant Classification Sensor Left Collision Detection - AutoCodes.com — B1785 2017 Toyota RAV4 Code - Front Occupant Classification Sensor Left Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1785 2017 Toyota RAV4?

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

How to Fix the DTC B1785 2017 Toyota RAV4?

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 B1785 2017 Toyota RAV4 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 B1785 2017 Toyota RAV4 code?

Need more information on how to fix the B1785 2017 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1785 2017 Toyota RAV4 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 B1785 2017 Toyota RAV4 Code

1. What does the OBDII code B1785 mean on a 2017 Toyota RAV4?

The B1785 code indicates a problem with the Front Occupant Classification Sensor Left Collision Detection system, which is part of the airbag system responsible for detecting seat occupancy.

2. What are the common symptoms of code B1785 in a 2017 Toyota RAV4?

Common symptoms include the airbag warning light staying on, improper airbag operation, and errors in detecting the left front seat occupant.

3. What causes the B1785 code to appear on a 2017 Toyota RAV4?

This code can be caused by a faulty occupant classification sensor, damaged wiring or connectors, or a collision that has impacted the sensorâ€™s functionality.

4. Can code B1785 affect airbag deployment in a 2017 Toyota RAV4?

Yes, this code can prevent the airbag from deploying properly or may cause it to deploy unnecessarily, depending on the sensor's malfunction.

5. How do you diagnose the B1785 code in a 2017 Toyota RAV4?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the occupant classification sensor and its wiring, and checking for physical damage or loose connections.

6. Can I drive my 2017 Toyota RAV4 with the B1785 code?

It is not recommended to drive with this code active, as it may compromise the airbag system's ability to protect occupants in a collision.

7. How is the B1785 code repaired on a 2017 Toyota RAV4?

Repairs typically include replacing the faulty occupant classification sensor, repairing damaged wiring or connectors, or recalibrating the system using a diagnostic tool.

8. Is the B1785 code covered under warranty for a 2017 Toyota RAV4?

It depends on your vehicle's warranty terms; airbag-related components may be covered under a longer warranty period. Check with your Toyota dealer for specifics.

9. Can clearing the B1785 code fix the problem in a 2017 Toyota RAV4?

Clearing the code without addressing the underlying issue will not fix the problem, and the code will likely return.

10. How much does it cost to fix the B1785 code on a 2017 Toyota RAV4?

Repair costs vary depending on the issue but can range from $200 to $600 or more, depending on whether the sensor, wiring, or other components need replacement.