B1787 Code - Rear Occupant Classification Sensor Left Collision Detection
Quick Answer
The B1787 diagnostic code refers to an issue with the Rear Occupant Classification Sensor Left Collision Detection system in a vehicle. Common causes include Faulty rear occupant classification sensor, Wiring or connection issues in the sensor system, Impact or damage to the sensor in a collision. 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 indicates Rear Occupant Classification Sensor Left Collision Detection.
- Common causes
- Common causes include Faulty rear occupant classification sensor, Wiring or connection issues in the sensor system, Impact or damage to the sensor in a collision.
- 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 B1787 Description
The B1787 diagnostic code refers to an issue with the Rear Occupant Classification Sensor Left Collision Detection system in a vehicle. This sensor is responsible for detecting the presence and weight of passengers in the rear left seat to ensure that the airbag deploys correctly in the event of a collision. When this code is triggered, it indicates a malfunction or error in the sensor, potentially jeopardizing the safety of occupants in the vehicle.
Common Causes of B1787
- Faulty rear occupant classification sensor
- Wiring or connection issues in the sensor system
- Impact or damage to the sensor in a collision
- Electronic control unit (ECU) malfunction
- Software or calibration errors in the sensor system
Symptoms of B1787
- Airbag warning light illuminated on the dashboard
- Inconsistent airbag deployment during testing
- Rear left seatbelt warning light activated
- Alarm or chime sounding when rear left seat is occupied
- Issues with the vehicle's Occupant Classification System (OCS)
How to Fix B1787
- Diagnose the specific cause of the issue using an OBD-II scanner and inspection of the sensor system
- Replace the faulty rear occupant classification sensor if necessary
- Repair or replace any damaged wiring or connections in the sensor system
- Reset the airbag system and clear the diagnostic trouble codes
- Test the sensor system to ensure proper functionality and airbag deployment
Cost to Fix B1787
The typical repair costs for addressing a B1787 code related to the Rear Occupant Classification Sensor Left Collision Detection can vary depending on the extent of the issue and the specific components that need to be repaired or replaced. In general, the cost of parts for a new sensor can range from $100 to $300, while labor costs can add another $100 to $200. Overall, the total repair cost may fall between $200 and $500 at an auto repair shop. It's important to note that these estimates are approximate and can fluctuate based on the factors mentioned earlier.
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Code B1787 Information for Specific Makes
- B1787 Lexus — Rear Occupant Classification Sensor Left Collision Detection
- B1787 Scion — Rear Occupant Classification Sensor Left Collision Detection
- B1787 Toyota — 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 Code
1. What are common symptoms of OBDII code B1787 (Rear Occupant Classification Sensor Left Collision Detection)?
- Common symptoms include the airbag warning light illuminating on the dashboard and possible issues with the rear occupant classification system.
2. What could cause OBDII code B1787 to trigger?
- This code may be triggered by a fault in the rear occupant classification sensor on the left side, wiring issues, or damage to the sensor due to a collision.
3. How serious is OBDII code B1787?
- This code is related to the rear occupant classification system, which is crucial for proper airbag deployment in the event of a collision. It should be addressed promptly to ensure the safety features are functioning correctly.
4. Can I continue driving with OBDII code B1787 present?
- It is not recommended to ignore this code and continue driving, as it indicates a potential issue with the rear occupant classification sensor that could affect airbag deployment in case of an accident.
5. What are some repair tips for OBDII code B1787?
- Repair tips include checking and repairing any damaged wiring, inspecting and replacing the rear occupant classification sensor if necessary, and clearing the code to see if it returns.
6. How can I diagnose OBDII code B1787?
- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the rear occupant classification sensor and its wiring for damage, and testing the sensor's functionality.
7. Are there any recalls related to OBDII code B1787?
- It's advisable to check with the vehicle manufacturer or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to the rear occupant classification system and this specific OBDII code.
8. Can a DIY enthusiast fix OBDII code B1787?
- Depending on your skill level and experience with automotive repairs, you may be able to address this code yourself by following repair guides and using the necessary tools to inspect and replace the rear occupant classification sensor.
9. How much does it cost to repair OBDII code B1787?
- The cost of repairing this code can vary depending on the extent of the damage, whether it requires sensor replacement, and if professional labor is needed. It's best to consult with a mechanic for an accurate estimate.
10. Will fixing OBDII code B1787 turn off the airbag warning light?
- Once the underlying issue triggering the code is repaired and the code is cleared, the airbag warning light should turn off. If it persists, further diagnosis may be required to ensure the system is functioning correctly.
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