AutoCodes – Lexus – B1650 Lexus

B1650 Lexus Code - Occupant Classification System Malfunction

Quick Answer

The Occupant Classification System circuit consists of the Center Airbag Sensor Assembly and the Occupant Detection ECU. Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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: B1650 Lexus indicates Occupant Classification System Malfunction.
Common causes: Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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 33,916

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 10, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1650 Lexus Description

The Occupant Classification System circuit consists of the Center Airbag Sensor Assembly and the Occupant Detection ECU. If the Center Airbag Sensor Assembly receives signals from the Occupant Detection ECU, it determines whether the Front Passenger Airbag Assembly, the Front Seat Airbag Assembly Right, and the Front Seat Belt Assembly should be operated. The B1650 code is recorded when a malfunction is detected in the Occupant Classification System circuit.

OBDII Code B1650 Lexus - Occupant Classification System Malfunction - AutoCodes.com — B1650 Lexus Code - Occupant Classification System Malfunction

What does this mean?

What are the Possible Causes of the DTC B1650 Lexus?

Faulty Occupant Detection ECU
Occupant Detection ECU harness is open or shorted
Occupant Detection ECU circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1650 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 B1650 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 B1650 Lexus code?

Need more information on how to fix the B1650 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1650 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 B1650 Lexus Code

1. What are the common symptoms of OBDII code B1650 in a Lexus related to the Occupant Classification System Malfunction?

The common symptoms include the airbag warning light staying illuminated, the passenger airbag being disabled, and potential issues with the seatbelt warning system.

2. What are some possible causes of the B1650 code in a Lexus OCCS malfunction?

Common causes of this code include a faulty occupant classification sensor, damaged wiring harnesses, a malfunctioning airbag control module, or issues with the seat weight sensor.

3. How can I diagnose the B1650 code related to the Occupant Classification System in my Lexus?

Diagnosing the B1650 code involves using a diagnostic scanner to retrieve the specific fault code, checking the wiring and connectors for any visible damage, and potentially performing testing on the occupant classification sensor and related components.

4. Can I drive my Lexus with the B1650 code present?

It is not recommended to drive the vehicle with the B1650 code present, as it indicates a malfunction in the occupant classification system, which could affect the proper deployment of airbags in the event of a collision.

5. How can I reset the B1650 code in my Lexus after repairing the Occupant Classification System malfunction?

After repairing the issue causing the B1650 code, you can reset the code using a diagnostic scanner or by disconnecting the car battery for a few minutes to clear the error codes.

6. Are there any DIY repair tips for fixing the B1650 code in a Lexus OCCS malfunction?

While some basic troubleshooting like checking for loose connectors or damaged wiring can be done DIY, more complex repairs involving sensor replacements or module reprogramming may require professional assistance.

7. Is it safe to ignore the B1650 code related to the Occupant Classification System malfunction?

Ignoring the B1650 code is not recommended, as it signifies a potential safety issue with the airbag system. It's important to address the problem promptly to ensure the proper functioning of the vehicle's safety features.

8. How much does it typically cost to repair the B1650 code in a Lexus OCCS malfunction?

Repair costs for the B1650 code can vary depending on the specific cause of the issue and the labor rates in your area. It's advisable to get a diagnostic assessment from a qualified mechanic to determine the exact repair costs.

9. Can a Lexus dealership help with diagnosing and repairing the B1650 code related to the Occupant Classification System malfunction?

Yes, Lexus dealerships have specialized diagnostic equipment and trained technicians who can accurately diagnose and repair issues related to the Occupant Classification System, including the B1650 code.

10. How can I prevent the B1650 code from recurring in my Lexus OCCS system?

To prevent the B1650 code from recurring, it's essential to address any underlying issues promptly, perform regular maintenance on the airbag system, and follow the manufacturer's recommended service schedule for the vehicle.