AutoCodes – Toyota – B1787 2017 Toyota RAV4

B1787 2017 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 2017 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 292

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 2017 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 2017 Toyota RAV4 - Rear Occupant Classification Sensor Left Collision Detection - AutoCodes.com — B1787 2017 Toyota RAV4 Code - Rear Occupant Classification Sensor Left Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1787 2017 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 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 B1787 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 B1787 2017 Toyota RAV4 code?

Need more information on how to fix the B1787 2017 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1787 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 B1787 2017 Toyota RAV4 Code

1. What does the OBDII code B1787 for the 2017 Toyota RAV4 indicate?

The code B1787 specifically relates to the Rear Occupant Classification Sensor Left Collision Detection on the 2017 Toyota RAV4.

2. What are some common symptoms associated with the B1787 code in a 2017 Toyota RAV4?

Common symptoms of the B1787 code may include issues with the left rear occupant classification sensor, such as improper detection or malfunction during a collision.

3. What are possible causes of the B1787 code in a 2017 Toyota RAV4?

Possible causes of the B1787 code in a 2017 Toyota RAV4 may include a faulty rear occupant classification sensor, wiring issues, or a problem with the airbag system.

4. How can I diagnose the B1787 code in my 2017 Toyota RAV4?

Diagnosing the B1787 code may involve using an OBDII scanner to read the code, inspecting the rear occupant classification sensor and its wiring for any visible damage, and conducting a thorough system check.

5. Is it safe to drive my 2017 Toyota RAV4 with the B1787 code?

It is recommended not to drive your vehicle if you suspect a malfunction related to the B1787 code, as it may affect the proper functioning of the rear occupant classification sensor during a collision.

6. Can I repair the B1787 code issue in my 2017 Toyota RAV4 myself?

Repairing the B1787 code may require specialized knowledge and tools, so it is advisable to consult a qualified mechanic or technician to address the issue accurately.

7. How much does it typically cost to repair the B1787 code in a 2017 Toyota RAV4?

The cost of repairing the B1787 code can vary depending on the exact cause of the issue, parts needed for replacement, labor costs, and any additional repairs that may be necessary.

8. Are there any recalls or service bulletins related to the B1787 code in the 2017 Toyota RAV4?

It is advisable to check with a Toyota dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or service bulletins related to the B1787 code for your specific vehicle.

9. Can the B1787 code in a 2017 Toyota RAV4 be reset without fixing the underlying issue?

Resetting the B1787 code without addressing the underlying issue may temporarily clear the error code, but the problem is likely to reoccur if the root cause is not repaired.

10. How important is it to fix the B1787 code in a 2017 Toyota RAV4 promptly?

It is crucial to address the B1787 code promptly to ensure the proper functioning of the rear occupant classification sensor and overall safety of the vehicle in the event of a collision.