AutoCodes – Scion – B1787 Scion

B1787 Scion Code - Rear Occupant Classification Sensor Left Collision Detection

Quick Answer

The Diagnostic Trouble Code (DTC) B1787 is output when the Occupant Detection ECU receives a collision detection signal sent by the Rear Occupant Classification Sensor Left (LH) when an accident occurs. Common causes include Faulty Separate Type Rear Seat Cushion Spring Assembly Left (Rear Occupant Classification Sensor Left), Separate Type Rear Seat Cushion Spring Assembly Left harness is open or shorted, Separate Type Rear 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: B1787 Scion indicates Rear Occupant Classification Sensor Left Collision Detection.
Common causes: Common causes include Faulty Separate Type Rear Seat Cushion Spring Assembly Left (Rear Occupant Classification Sensor Left), Separate Type Rear Seat Cushion Spring Assembly Left harness is open or shorted, Separate Type Rear 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 1,030

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 B1787 Scion Description

The Diagnostic Trouble Code (DTC) B1787 is output when the Occupant Detection ECU receives a collision detection signal sent by the Rear Occupant Classification Sensor Left (LH) when an accident occurs. DTC B1787 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 B1787 can be cleared by performing the zero point calibration and sensitivity check. Therefore, when DTC B1787 is output, first perform the zero point calibration and sensitivity check.

OBDII Code B1787 Scion - Rear Occupant Classification Sensor Left Collision Detection - AutoCodes.com — B1787 Scion Code - Rear Occupant Classification Sensor Left Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1787 Scion?

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

How to Fix the DTC B1787 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 B1787 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.

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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 B1787 Scion Code

1. What are the common symptoms of OBDII code B1787 in a Scion related to the Rear Occupant Classification Sensor Left Collision Detection?

The common symptoms include the airbag warning light being illuminated on the dashboard and possible issues with the airbag system's functionality.

2. What could be the potential causes of OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

Potential causes may include a malfunctioning rear occupant classification sensor, wiring issues, or a faulty airbag control module.

3. How can I diagnose the problem associated with OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

Diagnosing the issue requires using an OBDII scanner to retrieve the specific code, followed by inspecting the rear occupant classification sensor and related wiring for any visible damage or issues.

4. Are there any DIY repair tips for addressing OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

DIY repair tips include checking and repairing any damaged wiring, ensuring proper sensor connections, and, if needed, replacing the rear occupant classification sensor or the airbag control module.

5. Is it safe to drive a Scion with OBDII code B1787 related to the Rear Occupant Classification Sensor Left Collision Detection?

It is not recommended to drive the vehicle when the airbag warning light is illuminated, as it indicates potential issues with the airbag system's functionality and safety.

6. How much does it typically cost to repair OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

The cost of repair can vary depending on the specific issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

7. Can resetting the OBDII system clear the B1787 code related to the Rear Occupant Classification Sensor Left Collision Detection in a Scion?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after some time.

8. How important is it to fix OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

It is crucial to address this issue promptly, as it involves the vehicle's airbag system, which plays a vital role in occupant safety during a collision.

9. Is it necessary to visit a dealership or automotive specialist to repair OBDII code B1787 in a Scion related to the Rear Occupant Classification Sensor Left Collision Detection?

While visiting a dealership or specialist is recommended for proper diagnosis and repair, knowledgeable DIY enthusiasts can address some aspects of the issue themselves.

10. Are there any recalls or technical service bulletins related to OBDII code B1787 in a Scion for the Rear Occupant Classification Sensor Left Collision Detection?

It is advisable to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to this specific OBDII code to ensure proper resolution.