AutoCodes – Infiniti – B1021 Infiniti

B1021 Infiniti Code - Occupant Sensor Control Unit

Quick Answer

The Occupant Sensor Control Unit suppresses the deployment of passenger air bag when the condition of the passenger seat is empty or child and child-seat. Common causes include Faulty Occupant Sensor Control Unit, Occupant Sensor Control Unit harness is open or shorted, Occupant Sensor Control Unit 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: B1021 Infiniti indicates Occupant Sensor Control Unit.
Common causes: Common causes include Faulty Occupant Sensor Control Unit, Occupant Sensor Control Unit harness is open or shorted, Occupant Sensor Control Unit 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 1,887

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 Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1021 Infiniti Description

The Occupant Sensor Control Unit suppresses the deployment of passenger air bag when the condition of the passenger seat is empty or child and child-seat. And turns on the cut-off telltale lamp when the condition of the passenger seat is child-seat and child. In the case of malfunction, the blinking of the SRS air bag warning lamp reports the malfunction to the driver and by the on board self-diagnosis system. This Occupant Sensor Control Unit classifies occupant in the passenger seat and detects electrical malfunctions in Occupant Classification System, and transmits malfunction information to air bag control unit.
It is integrated into the seat sensor mat and detects the occupants with Occupant Classification System (OCS) control unit that classifies the occupants.

OBDII Code B1021 Infiniti - Occupant Sensor Control Unit - AutoCodes.com — B1021 Infiniti Code - Occupant Sensor Control Unit

What does this mean?

What are the Possible Causes of the DTC B1021 Infiniti?

Faulty Occupant Sensor Control Unit
Occupant Sensor Control Unit harness is open or shorted
Occupant Sensor Control Unit circuit poor electrical connection
Faulty Diagnosis Sensor Unit

How to Fix the DTC B1021 Infiniti?

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 B1021 Infiniti 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 B1021 Infiniti code?

Need more information on how to fix the B1021 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B1021 Infiniti Code

1. What is the OBDII code B1021 for Infiniti?

The OBDII code B1021 for Infiniti refers to a fault in the Occupant Sensor Control Unit, which is responsible for detecting the presence of occupants in the vehicle for proper airbag deployment.

2. What are common symptoms of a B1021 code in an Infiniti?

Common symptoms of a B1021 code in an Infiniti may include the airbag warning light illuminating on the dashboard, improper functioning of the airbags, and potential diagnostic trouble codes related to the occupant sensor system.

3. What are possible causes of the B1021 code in an Infiniti?

Possible causes of the B1021 code in an Infiniti include a faulty Occupant Sensor Control Unit, damaged wiring or connectors in the occupant sensor system, or issues with the seat occupancy detection mat.

4. How can I diagnose a B1021 code in my Infiniti?

Diagnosing a B1021 code in your Infiniti typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the occupant sensor control unit and related components for damage or corrosion, and testing the wiring and connectors for proper continuity.

5. Can I drive my Infiniti with a B1021 code?

It is not recommended to drive your Infiniti with a B1021 code present, as it may indicate a potential issue with the airbag system, which could affect its proper deployment in the event of an accident.

6. How can I repair a B1021 code in my Infiniti?

Repairing a B1021 code in your Infiniti may involve replacing the faulty Occupant Sensor Control Unit, repairing or replacing damaged wiring or connectors, or recalibrating the occupant sensor system as per manufacturer's guidelines.

7. Is it safe to reset the B1021 code in my Infiniti without addressing the underlying issue?

It is not recommended to simply reset the B1021 code in your Infiniti without addressing the underlying issue, as this may lead to continued problems with the occupant sensor system and compromise the safety of the airbag system.

8. How much does it cost to fix a B1021 code in an Infiniti?

The cost of fixing a B1021 code in an Infiniti can vary depending on the specific cause of the issue, the required repairs, and labor costs. It is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.

9. Can I prevent the B1021 code from reoccurring in my Infiniti?

Preventing the B1021 code from reoccurring in your Infiniti involves maintaining the occupant sensor system in good condition, avoiding physical damage to the sensors or control unit, and addressing any related issues promptly to ensure proper functioning of the airbag system.

10. How important is it to address a B1021 code in my Infiniti promptly?

It is crucial to address a B1021 code in your Infiniti promptly to ensure the proper functioning of the occupant sensor system and the safety of the airbag system. Ignoring the code may lead to potential safety risks in the event of a collision.