B1787 Toyota 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 Toyota 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.
Code B1787 Toyota Description
What are the Possible Causes of the DTC B1787 Toyota?
- 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 Toyota?
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 Toyota 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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Information for Specific Toyota Models
- B1787 2013 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
- B1787 2014 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
- B1787 2015 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
- B1787 2016 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
- B1787 2017 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
- B1787 2018 Toyota RAV4 — Rear Occupant Classification Sensor Left Collision Detection
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.
Frequently Asked Questions about B1787 Toyota Code
1. What are common symptoms of OBDII code B1787 Toyota related to the Rear Occupant Classification Sensor Left Collision Detection?
The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the rear occupant classification system.
2. What causes OBDII code B1787 Toyota to trigger for the Rear Occupant Classification Sensor Left Collision Detection?
This code is typically triggered by a malfunction in the rear occupant classification sensor located on the left side of the vehicle's interior.
3. How can I diagnose the issue causing OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
Diagnosing the issue involves using a diagnostic scan tool to read the code, inspecting the rear occupant classification sensor for damage or loose connections, and checking the wiring harness for any faults.
4. Can I repair OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection myself?
While some basic inspections and connection checks can be done by DIY enthusiasts, repairing this code may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.
5. Is it safe to drive with OBDII code B1787 Toyota triggered for the Rear Occupant Classification Sensor Left Collision Detection?
It is not recommended to drive the vehicle with this code triggered, as it indicates a potential issue with the rear occupant classification system, which could affect the proper deployment of airbags in case of a collision.
6. How much does it typically cost to repair OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
The cost of repair can vary depending on the extent of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to get a few quotes from different mechanics for an accurate estimate.
7. Are there any recalls or technical service bulletins related to OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
It is recommended to check with your local Toyota dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to this specific OBDII code.
8. Can weather conditions or environmental factors trigger OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
While extreme weather conditions or environmental factors are unlikely to directly trigger this code, they can sometimes exacerbate existing issues with the rear occupant classification sensor, leading to the code being triggered.
9. How long does it typically take to repair OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
The repair time can vary depending on the specific issue causing the code, the availability of parts, and the workload of the mechanic. In general, it may take a few hours to a day to diagnose and repair this issue.
10. What are the potential risks of ignoring OBDII code B1787 Toyota for the Rear Occupant Classification Sensor Left Collision Detection?
Ignoring this code can pose a safety risk in the event of a collision, as the rear occupant classification system may not function properly, affecting the deployment of airbags and potentially increasing the risk of injury to occupants.
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