AutoCodes – Lexus – B1788 Lexus

B1788 Lexus 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 Lexus 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 4,375

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

What does this mean?

What are the Possible Causes of the DTC B1788 Lexus?

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 Lexus?

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 Lexus 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 Lexus code?

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

Need Help with the Code?

Get the B1788 Lexus 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 B1788 Lexus Code

1. What are common symptoms of OBDII code B1788 in a Lexus related to the Rear Occupant Classification Sensor Right Collision Detection?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the passenger-side airbag deployment.

2. What are possible causes of OBDII code B1788 in a Lexus?

- Possible causes can include a faulty rear occupant classification sensor on the right side, wiring issues, or a problem with the airbag control module.

3. How can I diagnose the OBDII code B1788 in a Lexus related to the Rear Occupant Classification Sensor Right Collision Detection?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the sensor and related wiring for damage, and conducting tests to pinpoint the issue.

4. Can I still drive my Lexus with the OBDII code B1788 present?

- It is not recommended to drive the vehicle with the airbag warning light on as it indicates a potential safety issue with the airbag system. Have the issue diagnosed and repaired as soon as possible.

5. How can I repair OBDII code B1788 in a Lexus myself?

- DIY repair options include checking and securing the wiring connections to the rear occupant classification sensor, replacing the sensor if faulty, or resetting the airbag system after addressing the issue.

6. Is it safe to reset the OBDII code B1788 in a Lexus without fixing the underlying problem?

- It is not safe to reset the code without addressing the root cause as it may lead to the airbag system not functioning properly in the event of a collision.

7. How much does it typically cost to repair OBDII code B1788 in a Lexus at a dealership or repair shop?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for diagnostic time, parts, and labor. It is best to get a quote from a trusted mechanic.

8. Are there any recalls or technical service bulletins related to OBDII code B1788 in Lexus vehicles?

- It's advisable to check with a Lexus dealership or online resources for any recalls or technical service bulletins specific to this OBDII code in your vehicle model and year.

9. Can extreme temperatures or moisture affect the Rear Occupant Classification Sensor Right Collision Detection in a Lexus?

- Yes, extreme temperatures or moisture can potentially cause issues with the sensor or its connections, leading to the triggering of OBDII code B1788.

10. How important is it to address OBDII code B1788 in a Lexus promptly?

- It is crucial to address this code promptly as it relates to the proper functioning of the airbag system, which is a critical safety feature in the event of a collision.