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Engine-Codes – Scion – B1785 Scion

B1785 Scion Code - Front Occupant Classification Sensor Left Collision Detection

Quick Answer

The B1785 Scion code refers to the Front Occupant Classification Sensor Left Collision Detection system. Common causes include Faulty front occupant classification sensor, Wiring or connector issues in the sensor system, Impact or collision that damaged the sensor. 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 front occupant classification sensor, Wiring or connector issues in the sensor system, Impact or collision that damaged the sensor.
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 17, 2024
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Code B1785 Scion Description

The B1785 Scion code refers to the Front Occupant Classification Sensor Left Collision Detection system. This sensor is a crucial component of the vehicle's safety system, specifically designed to detect the presence and position of occupants in the front passenger seat. The sensor uses a combination of weight sensors and pressure sensors to determine whether the seat is occupied, the size of the occupant, and whether a collision has occurred.

OBDII Code B1785 Scion - Front Occupant Classification Sensor Left Collision Detection
B1785 Scion Code - Front Occupant Classification Sensor Left Collision Detection

Common Causes of B1785 Scion

  1. Faulty front occupant classification sensor.
  2. Wiring or connector issues in the sensor system.
  3. Impact or collision that damaged the sensor.
  4. Software or calibration issues in the sensor system.

Symptoms of B1785 Scion

  1. Airbag warning light illuminated on the dashboard.
  2. Inconsistent or incorrect airbag deployment.
  3. Passenger airbag may not deploy in a collision.
  4. Seatbelt warning light may be activated.

How to Fix B1785 Scion

  1. Begin by diagnosing the specific cause of the B1785 code using a diagnostic scanner.
  2. Inspect the front occupant classification sensor for any visible damage or signs of malfunction.
  3. Check the wiring and connectors for any loose connections or damage.
  4. If the sensor is faulty, replace it with a new OEM sensor.
  5. After replacing the sensor, clear the code and perform a test to ensure proper functioning of the system.

Cost to Fix B1785 Scion

The typical repair costs for addressing the B1785 Scion code can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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.

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