AutoCodes – Toyota – B1787 2015 Toyota RAV4

B1787 2015 Toyota RAV4 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 2015 Toyota RAV4 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 294

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 2015 Toyota RAV4 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 2015 Toyota RAV4 - Rear Occupant Classification Sensor Left Collision Detection - AutoCodes.com — B1787 2015 Toyota RAV4 Code - Rear Occupant Classification Sensor Left Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1787 2015 Toyota RAV4?

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 2015 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 B1787 2015 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 B1787 2015 Toyota RAV4 code?

Need more information on how to fix the B1787 2015 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1787 2015 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 B1787 2015 Toyota RAV4 Code

1. What does OBDII code B1787 for a 2015 Toyota RAV4 indicate?

The code B1787 on a 2015 Toyota RAV4 relates to the Rear Occupant Classification Sensor Left Collision Detection system.

2. What are common symptoms of a B1787 code in a 2015 Toyota RAV4?

Common symptoms of the B1787 code may include the airbag warning light illuminating on the dashboard or issues with the rear occupant classification system.

3. What typically causes the B1787 code to trigger in a 2015 Toyota RAV4?

The B1787 code in a 2015 Toyota RAV4 is usually triggered by a malfunction or fault in the rear occupant classification sensor on the left side related to collision detection.

4. How can I diagnose the B1787 code in my 2015 Toyota RAV4?

Diagnosing the B1787 code usually involves using an OBDII scanner to retrieve the specific fault code, checking the rear occupant classification sensor for any visible damage, and testing the sensor's wiring and connections.

5. Can I drive my 2015 Toyota RAV4 with a B1787 code?

It is not recommended to drive your 2015 Toyota RAV4 with a B1787 code present, as it indicates a potential issue with the rear occupant classification sensor that could affect the proper deployment of the airbags in the event of a collision.

6. Is it safe to repair the B1787 code in my 2015 Toyota RAV4 myself?

Due to the safety implications of airbag systems, it is recommended to have a qualified mechanic or dealership address and repair the B1787 code in your 2015 Toyota RAV4.

7. How much does it typically cost to repair a B1787 code in a 2015 Toyota RAV4?

The cost of repairing a B1787 code in a 2015 Toyota RAV4 can vary depending on the exact cause of the issue, but it may involve replacing the rear occupant classification sensor or addressing wiring/connectivity problems.

8. Can a B1787 code be intermittent in a 2015 Toyota RAV4?

Yes, a B1787 code in a 2015 Toyota RAV4 can sometimes be intermittent, meaning it may come and go depending on the sensor's functionality at a given time.

9. Will resetting the OBDII system clear the B1787 code in my 2015 Toyota RAV4?

While resetting the OBDII system may temporarily clear the B1787 code, it is important to diagnose and address the underlying issue to prevent the code from reoccurring.

10. How long does it take to repair a B1787 code in a 2015 Toyota RAV4?

The repair time for a B1787 code in a 2015 Toyota RAV4 can vary depending on the exact cause of the issue and the complexity of the repair, but it may take a few hours to complete the necessary diagnostics and repairs.