AutoCodes – Generic – B1020

B1020 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: B1020 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 14,209

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 B1020 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 B1020 - Occupant Sensor Control Unit - AutoCodes.com — B1020 Code - Occupant Sensor Control Unit

What does this mean?

What are the Possible Causes of the DTC B1020?

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 B1020?

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 B1020 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 B1020 code?

Need more information on how to fix the B1020 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1020 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1020 Buick — Auxiliary Electronic Control Unit Performance
B1020 Cadillac — Auxiliary Electronic Control Unit Performance
B1020 Chevrolet — Auxiliary Electronic Control Unit Performance
B1020 GMC — Auxiliary Electronic Control Unit Performance
B1020 Infiniti — Occupant Sensor Control Unit
B1020 Nissan — Occupant Sensor Control Unit

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 B1020 Code

1. What are the common symptoms of OBDII code B1020 related to the Occupant Sensor Control Unit?

The common symptoms include an illuminated airbag warning light on the dashboard and potential issues with the occupant detection system.

2. What can cause OBDII code B1020 to be triggered in the Occupant Sensor Control Unit?

The code B1020 can be triggered due to a malfunction in the occupant sensor control unit, damaged wiring, or a faulty occupant detection sensor.

3. How can I diagnose the OBDII code B1020 related to the Occupant Sensor Control Unit?

Diagnosing OBDII code B1020 typically involves using a diagnostic scanner to read the fault codes, inspecting the wiring and connections for any damage, and testing the occupant sensor control unit and detection sensor.

4. Can I reset the OBDII code B1020 without fixing the underlying issue in the Occupant Sensor Control Unit?

Resetting the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will likely persist and the code may reappear.

5. Is it safe to drive with OBDII code B1020 triggered in the Occupant Sensor Control Unit?

It is not recommended to drive with the airbag warning light illuminated, as it indicates potential issues with the occupant detection system, which is crucial for airbag deployment in case of an accident.

6. How can I repair OBDII code B1020 in the Occupant Sensor Control Unit?

Repairing OBDII code B1020 may involve replacing the faulty occupant sensor control unit, repairing damaged wiring, or recalibrating the occupant detection system as per manufacturer's recommendations.

7. Can a DIY enthusiast fix OBDII code B1020 related to the Occupant Sensor Control Unit?

While basic troubleshooting like inspecting wiring and connections can be done by a DIY enthusiast, diagnosing and repairing the occupant sensor control unit may require specialized tools and expertise, best left to professionals.

8. Will fixing OBDII code B1020 in the Occupant Sensor Control Unit be expensive?

The cost of fixing OBDII code B1020 can vary depending on the cause of the issue, the need for replacement parts, and labor costs. It is recommended to get a professional diagnosis for an accurate estimate.

9. How often does OBDII code B1020 related to the Occupant Sensor Control Unit occur in vehicles?

The occurrence of OBDII code B1020 can vary between different vehicle makes and models, but issues with the occupant sensor control unit are not uncommon in vehicles equipped with advanced safety systems.

10. Can OBDII code B1020 in the Occupant Sensor Control Unit affect the overall safety of the vehicle?

Yes, OBDII code B1020 indicates a potential problem with the occupant detection system, which can impact the proper functioning of the airbag system and compromise the safety of occupants in case of a collision.