AutoCodes – Generic – B1782

B1782 Code - Rear Occupant Classification Sensor Left Circuit Malfunction

Quick Answer

The Rear Occupant Classification Sensor Left (LH) circuit consists of the Occupant Detection ECU and the Rear Occupant Classification Sensor Left. 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: B1782 indicates Rear Occupant Classification Sensor Left Circuit Malfunction.
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 4,337

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 B1782 Description

The Rear Occupant Classification Sensor Left (LH) circuit consists of the Occupant Detection ECU and the Rear Occupant Classification Sensor Left. The Diagnostic Trouble Code (DTC) B1782 is recorded when a malfunction is detected in the Rear Occupant Classification Sensor Left circuit.

OBDII Code B1782 - Rear Occupant Classification Sensor Left Circuit Malfunction - AutoCodes.com — B1782 Code - Rear Occupant Classification Sensor Left Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1782?

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 B1782?

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 B1782 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 B1782 code?

Need more information on how to fix the B1782 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1782 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1782 Lexus — Rear Occupant Classification Sensor Left Circuit Malfunction
B1782 Scion — Rear Occupant Classification Sensor Left Circuit Malfunction
B1782 Toyota — Rear Occupant Classification Sensor Left Circuit Malfunction

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 B1782 Code

1. What are the common symptoms of OBDII code B1782?

Common symptoms of code B1782 include the airbag warning light illuminating on the dashboard, potential issues with the airbag system, and possible failure of the rear occupant classification sensor.

2. What can cause the Rear Occupant Classification Sensor Left Circuit Malfunction (B1782) code?

The B1782 code is usually triggered by a fault in the wiring or connectors leading to the rear occupant classification sensor, a malfunction within the sensor itself, or issues with the airbag system control module.

3. How serious is the B1782 code?

The B1782 code indicates a malfunction in the rear occupant classification sensor, which can affect the proper function of the airbag system. It is important to address this issue promptly to ensure the safety features of your vehicle are working correctly.

4. Can I still drive my vehicle with the B1782 code present?

While it may be possible to drive the vehicle with the B1782 code present, it is not recommended as the airbag system may not function properly in the event of a collision. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose the B1782 code?

Diagnosing the B1782 code typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors related to the rear occupant classification sensor, and testing the sensor itself for proper functionality.

6. What is the typical repair for the B1782 code?

The repair for the B1782 code may involve repairing or replacing damaged wiring or connectors, replacing the rear occupant classification sensor if faulty, or addressing any issues with the airbag system control module.

7. Can I fix the B1782 code myself?

Depending on your level of automotive expertise, you may be able to address the B1782 code yourself by checking and repairing wiring connections or replacing the rear occupant classification sensor. However, it is recommended to consult a professional technician for a proper diagnosis and repair.

8. Are there any tips to prevent the B1782 code from recurring?

To help prevent the B1782 code from recurring, it is important to ensure proper installation and maintenance of the rear occupant classification sensor, regularly inspect wiring and connectors for any signs of damage, and address any related issues promptly.

9. How much does it cost to repair the B1782 code?

The cost of repairing the B1782 code can vary depending on the underlying cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is recommended to obtain quotes from different shops for an accurate estimate.

10. Is the B1782 code covered under warranty?

Whether the B1782 code is covered under warranty will depend on your vehicle's warranty status, the specific terms of the warranty, and the cause of the issue. It is advisable to check with your vehicle manufacturer or warranty provider for more information.