AutoCodes – Scion – B1785 Scion

B1785 Scion 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 Scion 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 1,663

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
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Code B1785 Scion 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 Scion - Front Occupant Classification Sensor Left Collision Detection - AutoCodes.com — B1785 Scion Code - Front Occupant Classification Sensor Left Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1785 Scion?

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 Scion?

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 Scion 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 Scion code?

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

Need Help with the Code?

Get the B1785 Scion 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 Scion Code

1. What are the common symptoms of OBDII code B1785 in a Scion related to the Front Occupant Classification Sensor Left Collision Detection?

The common symptoms include the airbag warning light staying illuminated on the dashboard and possible issues with the front passenger airbag system.

2. What are the potential causes of OBDII code B1785 in a Scion?

Possible causes of this code include a malfunction or fault in the front occupant classification sensor on the left side, wiring issues, or a problem with the airbag control module.

3. How can I diagnose the Front Occupant Classification Sensor Left Collision Detection issue in my Scion?

Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code (B1785) and then inspecting the front occupant classification sensor and related wiring for any visible damage or faults.

4. Can I repair the B1785 code in my Scion at home?

While some DIY enthusiasts may attempt to address the issue themselves, it is recommended to have the problem diagnosed and repaired by a qualified mechanic or dealership to ensure proper resolution and safety compliance.

5. Is it safe to drive my Scion with the B1785 code present?

It is not recommended to drive the vehicle with the B1785 code active, as it indicates a potential issue with the front occupant classification sensor and airbag system, which can compromise safety in the event of a collision.

6. How much does it typically cost to repair the Front Occupant Classification Sensor Left Collision Detection issue in a Scion?

The cost of repair can vary depending on the exact cause of the problem, parts needed, and labor costs. It is advisable to obtain a quote from a professional technician for an accurate estimate.

7. Can resetting the OBDII code B1785 resolve the issue temporarily?

Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the B1785 code to trigger. It is crucial to address the root cause of the issue for a permanent solution.

8. Are there any recalls or technical service bulletins related to the B1785 code in Scion vehicles?

It is recommended to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to the Front Occupant Classification Sensor Left Collision Detection issue in your specific Scion model.

9. Will the B1785 code affect the overall performance of my Scion vehicle?

While the code may not directly impact the driving performance of the vehicle, it can affect the proper functioning of the airbag system, which is a crucial safety feature in the event of a collision.

10. How long does it take to repair the Front Occupant Classification Sensor Left Collision Detection issue in a Scion?

The repair time can vary depending on the exact cause of the problem and the availability of parts. It is advisable to consult with a professional technician for an estimated duration of the repair process.