AutoCodes – Toyota – B1788 Toyota

B1788 Toyota Code - Rear Occupant Classification Sensor Right Collision Detection

Quick Answer

The Diagnostic Trouble Code (DTC) B1788 is output when the Occupant Detection ECU receives a collision detection signal sent by the Rear Occupant Classification Sensor Right (RH) when an accident occurs. Common causes include Faulty Separate Type Rear Seat Cushion Spring Assembly Right (Rear Occupant Classification Sensor Right), Separate Type Rear Seat Cushion Spring Assembly Right harness is open or shorted, Separate Type Rear Seat Cushion Spring Assembly Right 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: B1788 Toyota indicates Rear Occupant Classification Sensor Right Collision Detection.
Common causes: Common causes include Faulty Separate Type Rear Seat Cushion Spring Assembly Right (Rear Occupant Classification Sensor Right), Separate Type Rear Seat Cushion Spring Assembly Right harness is open or shorted, Separate Type Rear Seat Cushion Spring Assembly Right 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 7,838

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 B1788 Toyota Description

The Diagnostic Trouble Code (DTC) B1788 is output when the Occupant Detection ECU receives a collision detection signal sent by the Rear Occupant Classification Sensor Right (RH) when an accident occurs. DTC B1788 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 B1788 can be cleared by performing the zero point calibration and sensitivity check. Therefore, when DTC B1788 is output, first perform the zero point calibration and sensitivity check.

OBDII Code B1788 Toyota - Rear Occupant Classification Sensor Right Collision Detection - AutoCodes.com — B1788 Toyota Code - Rear Occupant Classification Sensor Right Collision Detection

What does this mean?

What are the Possible Causes of the DTC B1788 Toyota?

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

How to Fix the DTC B1788 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 B1788 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.

Need more information about the B1788 Toyota code?

Need more information on how to fix the B1788 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1788 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

B1788 2013 Toyota RAV4 — Rear Occupant Classification Sensor Right Collision Detection
B1788 2014 Toyota RAV4 — Rear Occupant Classification Sensor Right Collision Detection
B1788 2015 Toyota RAV4 — Rear Occupant Classification Sensor Right Collision Detection
B1788 2016 Toyota RAV4 — Rear Occupant Classification Sensor Right Collision Detection
B1788 2017 Toyota RAV4 — Rear Occupant Classification Sensor Right Collision Detection
B1788 2018 Toyota RAV4 — Rear Occupant Classification Sensor Right 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.

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 B1788 Toyota Code

1. What does the OBDII code B1788 mean for a Toyota?

Code B1788 indicates an issue with the Rear Occupant Classification Sensor Right Collision Detection, often related to the sensor detecting abnormal signals due to a collision or malfunction.

2. What are the common symptoms of code B1788 in a Toyota?

Symptoms typically include the airbag warning light illuminating, improper airbag system functioning, or failure of the rear occupant classification system.

3. What causes code B1788 to appear in a Toyota?

This code can be triggered by sensor damage from a collision, wiring issues, connector problems, or a fault in the occupant classification system.

4. Can code B1788 affect airbag deployment in a Toyota?

Yes, this issue may impact airbag deployment accuracy, as the occupant classification system helps determine how airbags should deploy in an accident.

5. How can I diagnose code B1788 in a Toyota?

Use an OBDII scanner to confirm the code, then inspect the rear occupant classification sensor, wiring, and connectors for damage or loose connections.

6. How do you fix code B1788 in a Toyota?

Repairs may include replacing the rear occupant classification sensor, fixing damaged wiring, or addressing connector issues. Calibration of the sensor system may also be needed.

7. Can code B1788 be caused by a minor collision?

Yes, even a minor collision can damage the rear occupant classification sensor or affect its calibration, triggering this code.

8. Is it safe to drive a Toyota with code B1788 active?

Driving with this code active may compromise airbag system functionality, so itâ€™s recommended to address the issue promptly to ensure passenger safety.

9. How much does it cost to fix code B1788 in a Toyota?

Repair costs can vary, but replacing the rear occupant classification sensor and recalibrating the system typically ranges from $200 to $600 depending on labor and parts.

10. Can I clear code B1788 without fixing the problem?

Clearing the code without resolving the underlying issue may temporarily turn off the warning light, but the problem will likely return and could compromise safety systems.